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Sep 28 ― UNEXPECTED SABBATICAL
Sep 21 ― Q&A: Glaciogenic Flooding
Sep 14 ― August 27 Lunar Eclipse
Aug 31 ― When Optics Meets Electricity
Aug 24 ― Earth’s Mini-Moon
Aug 17 ― The First Earthrise
Aug 10 ― Apollo’s Message to Artemis
Aug 03 ― Mirrors in Orbit Turn Night Into Day
Jul 27 ― The Moon in 1776
Jul 20 ― Q&A: Why We Don’t See Green Sunsets
Jun 29 ― Q&A: How to Destroy Enriched Uranium
Jun 01 ― Q&A: Why You Can Hear the Wind
May 18 ― Q&A: How to Make an Anaglyph
Apr 20 ― Free Return Trajectories
Apr 13 ― Q&A: How to Move a Moon Rocket
Apr 06 ― Laser Weaponry
Mar 23 ― Snowmen in Space
Mar 09 ― Q&A: The Physics of Heat Shields
Mar 02 ― Living in the Shadow of a Mountain
Feb 23 ― Q&A: How They Make Helium
Feb 16 ― Why Snow Sometimes Squeaks
Feb 09 ― Q&A: The Color of Pure Water
Feb 02 ― Death of the World’s Largest Iceberg
Jan 26 ― The Sun’s Gravitational Lens
Jan 19 ― How NOAA’s GeoColor Works
Jan 12 ― Q&A: Digging a Hole to China
Jan 05 ― Imagine Being a Million Miles Away
Dec 29 ― Questions to Start the New Year
Dec 22 ― Q&A: Santa’s Sleigh Sighted?
Dec 15 ― Seeing Through the Sombrero
Dec 08 ― How to Photograph an Aurora
Dec 01 ― ICBM Testing
Nov 24 ― Q&A: How Flight Data Recorders Work
Nov 17 ― Category 6 Hurricanes — Reprise
Nov 10 ― Electrostatic Cloud Seeding
Nov 03 ― Q&A: How Cloud Seeding Works
Oct 27 ― Martian Biosignature?
Oct 20 ― Boosting the Orbit of a Satellite
Oct 13 ― Q&A: How 3D Printers Work
Oct 06 ― Rotating Detonation Rocket Engines
Sep 22 ― No Rain in the Forecast
Sep 08 ― Q&A: Why Rivers Meander
Sep 01 ― How Riptides Form
Aug 25 ― 50,000 Years Ago
Aug 18 ― Q&A: How Warning Sirens Work
Aug 11 ― Clocking the Speed of a Glacier
Aug 04 ― Sprites
Jul 28 ― The First Lunar Lander
Jul 21 ― Q&A: How Uranium Is Enriched
Jul 14 ― How Bunker Buster Bombs Work
Jul 07 ― Evolution of Stealth
Jun 30 ― Q&A: Saharan Dust Clouds
Jun 23 ― Geoengineering the Arctic
Jun 16 ― Physics of Candle Flames
Jun 09 ― Evolution of Nuclear Weapons
Jun 02 ― Q&A: Extracting Water From the Air
May 26 ― OceanWell Desalination Innovation
May 19 ― Rivers vs. Estuaries
May 12 ― 50 Years of Earth Days
May 05 ― Why Nightscapes Are Grayscale
Apr 28 ― Q&A: MLB Torpedo Bats
Apr 21 ― The Cheapest Ticket to Zero Gravity
Apr 14 ― Q&A: Meteor Crater
Apr 07 ― Starburst Regions
Mar 31 ― The Edge of a Stratus Cloud
Mar 17 ― Formation of the Strait of Gibraltar
Mar 10 ― Twilight Seen From Space
Mar 03 ― World Record Firecracker String
Feb 24 ― Nuclear Thermal Propulsion
Feb 03 ― AI Podcast of Jan 6 Post
Jan 27 ― Color Shifting Sunset
Jan 20 ― Mass vs. Weight on the Moon
Jan 13 ― Q&A: How My Animations Are Created
Jan 06 ― Crescent Moon and Venus
Dec 30 ― Questions to Start the New Year
Dec 23 ― Santa’s Sleigh Sighted?
Dec 16 ― AMOC Update
Dec 09 ― How Particle Accelerators Work
Dec 02 ― Q&A: How Generators Work
Nov 25 ― The Problem With Bohr’s Atom
Nov 11 ― Nobel Peace Prize for Nihon Hidankyo
Nov 04 ― Fireworks Error
Oct 28 ― SAM Reduced Gravity Simulator
Oct 21 ― Coal Bites the Dust in UK
Oct 14 ― Q&A: Rocket Powered Cars
Oct 07 ― The Flame Eater
Sep 30 ― Moonwalking
Sep 23 ― Eye of the Beholder
Sep 09 ― Wisconsin Aurora
Sep 02 ― Pareidolia Part 3
Aug 26 ― An Ice-Powered Heat Engine
Aug 19 ― How Global Warming Started
Aug 12 ― Q&A: Deorbiting the ISS
Aug 05 ― Q&A: Derechos
Jul 29 ― The Penguin and Egg Galaxies
Jul 22 ― Solar Canals
Jul 15 ― Aerosols, Clouds, and Global Warming
Jun 17 ― The Significance of Starliner
Jun 10 ― Ocean Gyres and Hurricanes
Jun 03 ― Q&A: How Satellites Point Themselves
May 27 ― Extreme Southerly Aurora
May 20 ― Blue Sunset on the Red Planet
May 13 ― Small Modular Reactors
May 06 ― The Darkening
Apr 29 ― April 8 Solar Eclipse
Apr 22 ― Vandenberg SFB Falcon 9 Launch
Apr 15 ― Green Energy From the Drinking Bird
Apr 08 ― Remarkably Red Rayleigh Sunset
Apr 01 ― April Un-Fools Day
Mar 25 ― Q&A: Moonrise, Moonset, and Phase
Mar 18 ― Black Clouds
Mar 11 ― Anti-Sunsets
Mar 04 ― Solar Eclipse by Phobos
Feb 26 ― Window Frost
Feb 19 ― Hoar Frost
Feb 12 ― Golden Sunsets
Feb 05 ― Beach Mushrooms
Jan 29 ― Q&A: The Coriolis Force
Jan 22 ― Q&A: How Fast Earth Spins
Jan 15 ― Camping On an Iceberg
Jan 08 ― Climate Science 101
Jan 01 ― Questions to Start the New Year
Dec 25 ― Q&A: Santa’s Sleigh Sighted?
Dec 11 ― Lighting up The Sky
Dec 04 ― Q&A: White Hydrogen
Nov 27 ― Q&A: Siphoning Hoover Dam
Nov 20 ― Sunset Slide Show
Nov 13 ― Sidereal vs. Synodic Periods
Nov 06 ― Ring of Fire Eclipse
Oct 30 ― Inferior and Superior Conjunctions
Oct 23 ― Q&A: Transits of Venus and Mercury
Oct 16 ― First Lab Measurement of Light Speed
Oct 09 ― Q&A: Tidal Power
Oct 02 ― Q&A: Hurricane Spaghetti Maps
Sep 25 ― Q&A: Firenadoes
Sep 18 ― Q&A: Santa Ana Winds
Sep 11 ― Upgrading the Grid
Sep 04 ― Benham Discs
Aug 28 ― Q&A: Bicycle Wheel Illusion
Aug 21 ― New Resources on Sky Lights
Aug 14 ― Density Altitude Revisited
Aug 07 ― Pumped Storage at Apache Lake
Jul 31 ― Hygroelectricity
Jul 24 ― Q&A: Persistence of Vision
Jul 17 ― Crab Nebula Time-Lapse
Jul 10 ― Light and Shadow on Mars
Jul 03 ― Direct Causes of Wildfires
Jun 19 ― Q&A: Canada Wildfire Smoke
Jun 05 ― Cloud Color Evolution at Sunset
May 29 ― Myth of the Watering Hole
May 22 ― Q&A: Anatomy of a Rainstorm
May 15 ― The Doomsday Glacier
May 08 ― Simple DIY Weather Station
May 01 ― Q&A: How Astronauts Shower
Apr 24 ― Project Artemis
Apr 17 ― The True Shape of Raindrops
Apr 03 ― Why Astronauts Stumbled on the Moon
Mar 27 ― Timekeeping on the Moon
Mar 20 ― Q&A: Nyctinasty
Mar 13 ― Q&A: How Astronauts Sleep
Mar 06 ― Q&A: How Astronauts Exercise
Feb 27 ― Mammatus Clouds
Feb 20 ― Q&A: How Weather Balloons Work
Feb 06 ― Q&A: Unusual Cloud Formation
Jan 30 ― Q&A: Puzzling Atmospheric Apparition
Jan 23 ― Bad Science in Advertising
Jan 16 ― Perfect Storm for a Rainbow
Jan 09 ― Fog in the Desert
Jan 02 ― Sunset Serendipity
Dec 26 ― Q&A: Questions to Start the New Year
Dec 19 ― Q&A: Santa’s Sleigh Sighted?
Dec 12 ― Kilauea 1986
Dec 05 ― Where Is ET?
Nov 28 ― Q&A: Vectored Thrust
Nov 14 ― Burning Clouds
Nov 07 ― Q&A: The Pillars of Creation
Oct 31 ― Red White & Blue
Oct 24 ― Hunter’s Moon Rising With Jupiter
Oct 17 ― Q&A: DART Disrupts Dimorphos
Oct 10 ― Kaguya Shoots the Moon
Oct 03 ― Q&A: Forces During Crashes
Sep 26 ― Q&A: Carbon Capture
Sep 19 ― Liquid Aurora
Sep 12 ― Miscalculated Moonrise
Sep 05 ― NFL Vector Addition Demo
Aug 29 ― Q&A: How Air Conditioners Work
Aug 22 ― Unobtainium Found on Earth
Aug 15 ― Q&A: Maximum Range of a Cannon
Aug 01 ― Eclipses and the Line of Nodes
Jul 25 ― Q&A: Deimos Eclipsed by Phobos
Jul 18 ― Q&A: JWST Teaser Image
Jul 11 ― Extreme Tides in the 2030s
Jul 04 ― Remarkable Real Image
Jun 27 ― Low Moon
Jun 20 ― Q&A: How Basketballs Rim Out
Jun 06 ― Conjunction of Jupiter and Venus
May 30 ― Q&A: Phobos Speed Illusion
May 23 ― Phobos Annular Eclipse
May 09 ― Q&A: Earth’s Tallest Mountain
May 02 ― Altocumulus Lenticularis Duplicatus
Apr 25 ― Q&A: The Northwest Passage
Apr 18 ― Dance of Four Planets
Apr 11 ― Extreme Superior Mirage Revisited
Apr 04 ― Why It’s Called Sunday
Mar 28 ― The Wildfire that Wasn’t
Mar 21 ― Walking Water Bottle
Mar 14 ― Q&A: Hypermiling Stoplights
Mar 07 ― Adaptation or Coincidence?
Feb 21 ― Point Nemo – Spacecraft Graveyard
Feb 14 ― Bomb Cyclones
Feb 07 ― Q&A: Gravitational Assists Explained
Jan 24 ― Mountain Fog
Jan 17 ― Q&A: How to Watch a Meteor Shower
Jan 10 ― Bubble Curtains vs. Hurricanes
Jan 03 ― The World’s Fastest Chicken
Dec 27 ― Q&A: Questions to Start the New Year
Dec 20 ― Q&A: Santa’s Sleigh Sighted?
Dec 13 ― The Kessler Syndrome
Dec 06 ― Q&A: Electricity Without Wires
Nov 29 ― Scotland Is Shrinking
Nov 15 ― Q&A: Atmospheric Rivers
Nov 08 ― Q&A: Earth’s Finite Atmosphere
Nov 01 ― First Photo of Earth From Space
Oct 25 ― The Second Age of Sail
Oct 11 ― Q&A: Getting Water From Rocks
Oct 04 ― Deadpool at Hoover Dam
Sep 20 ― Flying To Mars at the Speed of Light
Sep 13 ― Q&A: The Roads Are Not Melting
Sep 06 ― Q&A: Puzzling Groundwater Resurgence
Aug 23 ― Q&A: Why Ricocheted Bullets Whistle
Aug 16 ― Branson vs. Bezos
Aug 09 ― Q&A: Light Color and Light Pollution
Aug 02 ― Science Fair Cloud Chamber Tracks
Jul 26 ― Q&A: Heat Domes
Jul 19 ― Q&A: What UAPs Could Be
Jul 12 ― Q&A: What UAPs Aren’t
Jul 05 ― Wildfires and Air Quality
Jun 28 ― Lunar Eclipse vs. Fast Clouds
Jun 14 ― Q&A: How We Knew Space Was a Vacuum
Jun 07 ― ISS Over Phoenix v.2
May 31 ― Predicting Orbital Debris Reentry
May 24 ― Q&A: How to Make Fuel From Ice
May 17 ― Q&A: The Persistence of Contrails
May 10 ― Bird Feeder Chaos
May 03 ― Q&A: The Sound of a Bell on Mars
Apr 26 ― ISS Over Phoenix
Apr 19 ― ISS Over Arizona
Apr 12 ― Q&A: The Polar Vortex
Apr 05 ― Surviving in Space – Part 2
Mar 29 ― Q&A: Surviving in Space – Part 1
Mar 22 ― Q&A: Space Walk Physics
Mar 15 ― Q&A: Basketball on the Moon
Mar 08 ― Q&A: Pillow Clouds
Mar 01 ― Mountainshine
Feb 15 ― Mountain Snow Sunset
Feb 08 ― Q&A: Rime Ice vs Hoar Frost
Feb 01 ― Neon Clouds
Jan 25 ― Afocal Astrophotography Experiment
Jan 18 ― Lakeshore Icicles
Jan 04 ― What Mountain Is That?
Dec 28 ― Q&A: Questions to Start the New Year
Dec 21 ― Q&A: Santa’s Sleigh Sighted?
Dec 07 ― Arizona Dawn
Nov 30 ― Q&A: How Black Holes Spin
Nov 23 ― Q&A: How Smoke Rings Work
Nov 16 ― Q&A: Squinting At Bright Lights
Nov 09 ― Arizona Starset
Nov 02 ― Q&A: Parabolic Solar Concentrators
Oct 19 ― Red Roadster Buzzes Red Planet
Oct 12 ― Q&A: Air Leak on the Space Station
Oct 05 ― Q&A: Incoming Speed of a Meteor
Sep 28 ― Wildfire Sunsets
Sep 21 ― The Colors of Lakes
Sep 14 ― Two Good Things About Wildfires
Sep 07 ― Q&A: Traveling Rainbow
Aug 31 ― Why I Get My Weather From NWS
Aug 24 ― Perseverance and Ingenuity
Aug 10 ― Q&A: How Bicycle Reflectors Work
Aug 03 ― ISS Transits NEOWISE
Jul 27 ― Spookily Accurate Weather Forecast
Jul 20 ― Q&A: How RTGs Work
Jul 13 ― Proxima Centauri Parallax
Jul 06 ― Q&A: The Unearthly Moons of Mars
Jun 15 ― Q&A: Meteor Impacts on the Moon
Jun 08 ― Q&A: What Causes Wind
Jun 01 ― One Olympic Swimming Pool
May 25 ― Q&A: Infinity Mirrors
May 18 ― Q&A: Hall of Mirrors
May 11 ― Faux Fireball
May 04 ― Q&A: Flapping Your Arms and Flying
Apr 20 ― Cloud-Edge Effects on Solar Arrays
Apr 13 ― Q&A: Ice Tsunamis
Apr 06 ― Q&A: Exponential Growth
Mar 16 ― Practical Artificial Gravity
Mar 09 ― Q&A: Artificial Gravity
Feb 24 ― Getting to Mars as Fast as Possible
Feb 17 ― Getting to Mars Faster
Feb 03 ― Tip of the Iceberg Redefined
Jan 27 ― What’s Up With Betelgeuse
Jan 20 ― Earth Rotation Visualized
Jan 13 ― Looming Stadium Mirage
Dec 30 ― Six Questions to Start the New Year
Dec 23 ― Q&A: Santa’s Sleigh Sighted?
Nov 25 ― Seiches on Lakes
Nov 18 ― Q&A: Refraction of Light in a Vortex
Oct 28 ― Rare New River Tornado
Oct 21 ― Climate 100 Years From Now
Oct 14 ― Q&A: Anemometers on Moving Vehicles
Oct 07 ― Q&A: How the Stars Got Their Names
Sep 30 ― Q&A: Cassegrain Optics
Sep 23 ― Nuking a Hurricane
Sep 09 ― Q&A: Nemesis
Sep 02 ― Q&A: Electric Airplanes
Aug 26 ― Q&A: How Glaciers Melt
Aug 12 ― Q&A: The Moon Is Falling
Jul 29 ― Q&A: How Light Sails Work
Jul 22 ― Nobody Owns the Moon
Jul 15 ― Q&A: How Weather is Predicted
Jul 08 ― Q&A: Drones on Mars
Jun 17 ― When the Invisible Becomes Visible
Jun 03 ― Two Takes on Rain
May 20 ― Q&A: Why Rockets Use Stages
May 13 ― Sunset Virga
Apr 22 ― Iridescent Clouds Revisited
Apr 15 ― First Image of a Black Hole
Apr 08 ― Grayscale Rainbow
Apr 01 ― Extreme Superior Mirage
Mar 25 ― Clouds, Rain, and Fog
Mar 18 ― Q&A: Far Side of the Moon
Mar 11 ― Q&A: Suborbital Weightlessness
Mar 04 ― Q&A: Graupel
Feb 25 ― Strange Island
Feb 18 ― Glitter Paths
Feb 04 ― Q&A: Ultima Thule
Jan 28 ― Q&A: Lost Helium Balloons
Jan 21 ― Hiking Mars via Virtual Reality
Jan 14 ― Q&A: Squashed Moon
Jan 07 ― Q&A: Milky Way Dynamics
Dec 31 ― Six Questions to Start the New Year
Dec 24 ― Q&A: Santa’s Sleigh Sighted?
Dec 10 ― The Gravity of Melting Glaciers
Dec 03 ― Q&A: Water on the Moon
Nov 26 ― Q&A: Acid Rain and Acid Oceans
Nov 19 ― Hexagonal Time Machine
Nov 12 ― Q&A: Why the Moon Follows You
Nov 05 ― Q&A: How the Sun Got Its Name
Oct 29 ― Rainbow on a Railing
Oct 08 ― October 14 Quintuple Conjunction
Sep 17 ― Pareidolia Revisited
Sep 10 ― Edwin Hubble’s Eureka Moment
Aug 27 ― Q&A: Wind Power is Inexhaustible
Aug 20 ― Q&A: Neutrino Detection by IceCube
Aug 13 ― Q&A: What On Earth?
Aug 06 ― 2018 Perseid Meteor Shower
Jul 30 ― Q&A: Asymmetric Moon Cratering
Jul 23 ― Missed It By That Much
Jul 16 ― Q&A: Crossing Contrails
Jul 09 ― Monsoon Haboobs
Jul 02 ― 2018 Mars Opposition
Jun 25 ― Q&A: Why Planets are Round
Jun 18 ― Q&A: Erosion and Rising Sea Levels
Jun 11 ― More Things Moving Backwards
Jun 04 ― Q&A: Moss on the North Side of Trees
May 28 ― Q&A: Reciprocity Failure Explained
May 21 ― Astrophotography Then and Now
May 14 ― Equinox as Seen from Orbit
May 07 ― Q&A: Birds Flying Backwards
Apr 30 ― Q&A: Your Car is a Faraday Cage
Apr 23 ― Mother Goose Heads South
Apr 16 ― 2018 Lyrid Meteor Shower
Apr 09 ― Q&A: Violet Colored Sky
Apr 02 ― Radical Rayleigh Sunset
Mar 26 ― Q&A: Meteor Trails
Mar 19 ― Q&A: Sunset vs. Sunrise
Mar 12 ― Earth’s Water Resources
Mar 05 ― If All Earth’s Ice Melted
Feb 26 ― Split Sunset
Feb 19 ― Construction Dust
Feb 12 ― Phoenix Fata Morgana
Feb 05 ― Q&A: Fog Explained
Jan 29 ― Cloud Street Illusion
Jan 22 ― Falcon 9 Rocket Launch
Jan 15 ― Planet Earth Breathing
Jan 08 ― Proof that Earth is Round
Jan 01 ― Six Questions to Start the New Year
Dec 25 ― Q&A: Santa’s Sleigh Sighted?
Dec 18 ― Christmas Past
Dec 11 ― December 2017 Geminid Meteor Shower
Dec 04 ― Q&A: Interstellar Visitors
Nov 27 ― Neutron Stars Explained
Nov 20 ― Q&A: Discovery of Gravity
Nov 13 ― Q&A: When Neutron Stars Collide
Nov 06 ― Q&A: Wildfire Smoke Dispersion
Oct 30 ― Q&A: How Moving Water Freezes
Oct 23 ― Catch Comet ASASSN1
Oct 16 ― Q&A: Constructing a Theodolite
Oct 09 ― Q&A: Greatest Elongation of Venus
Oct 02 ― Q&A: Yet Another Strange Cloud
Sep 25 ― Cumulonimbus Rising v.3
Sep 18 ― Anatomy of a Storm Surge
Sep 11 ― Q&A: Category 6 Hurricanes
Sep 04 ― Q&A: Solar Time-Lapse Basics
Aug 21 ― Solar Eclipse Slideshow
Aug 14 ― Observing the Great American Eclipse
Jul 31 ― Cumulonimbus Rising v.2
Jul 24 ― Q&A: Distance to the Horizon
Jul 10 ― Images of Earth with Moon
Jul 03 ― Q&A: How We Know Earth’s Mass
Jun 26 ― Density Altitude
Jun 12 ― Q&A: Cosmic Speed Limit
Jun 05 ― An Impossible Sunset
May 29 ― Q&A: Orographic Clouds
May 22 ― Habitable Exoplanets
May 15 ― Q&A: Life on Mars
May 08 ― Q&A: Another Strange Cloud
May 01 ― Desert Sunset Composite
Apr 24 ― Jupiter and Comet 41P
Apr 17 ― An Unusual Rainbow
Apr 10 ― Q&A: How Pi is Calculated
Apr 03 ― Stonehenge in Colorado
Mar 27 ― Part 2: Retinal Hyper-Oxygenation
Mar 20 ― Part 1: Retinal Hyper-Oxygenation
Mar 06 ― Q&A: VTVL – SpaceX and Falcon 9
Feb 27 ― Universal Clock
Feb 20 ― Q&A: Why it Always Rains on Weekends
Feb 13 ― Q&A: Daytime Lunar Eclipse
Feb 06 ― Lunar Eclipse Geometry
Jan 30 ― Telling Time by the Stars
Jan 23 ― Q&A: Trajectory of the Moon
Jan 16 ― Q&A: Terminal Velocity
Jan 09 ― Q&A: Planet 9
Jan 02 ― Six Questions to Start the New Year
Dec 26 ― Q&A: Santa’s Sleigh Sighted?
Dec 19 ― The Meaning of Magnitude
Dec 12 ― Super Moon vs. Normal Moon
Dec 05 ― Venus in December 2016
Nov 21 ― Circumhorizontal Arcs
Nov 07 ― Occultation of Aldebaran – The Video
Oct 31 ― November 2 Quadruple Conjunction
Oct 24 ― Q&A: Why the Week has Seven Days
Oct 10 ― The Big Bang Blues
Oct 03 ― Cumulonimbus Rising
Sep 19 ― September 19 Vandenberg Launch
Sep 12 ― Colorado Lightning Storm
Sep 05 ― Q&A: How GPS Works
Aug 29 ― Q&A: Metaphor – Stars as Diamonds
Aug 22 ― August 23-24 Triple Conjunction
Aug 15 ― Q&A: Redshift and Blueshift
Aug 08 ― The Doppler Effect
Aug 01 ― 2016 Perseid Meteor Shower
Jul 25 ― Q&A: The Geometry of Angular Size
Jul 18 ― Q&A: The Midnight Sun
Jul 11 ― Crepuscular Rays – Reprise
Jul 04 ― Q&A: Fireworks Pattern Shells
Jun 27 ― Q&A: The Temperature of Space
Jun 20 ― Saturn’s Rings Near Maximum Tilt
Jun 13 ― Q&A: The Formal Name of Our Moon
Jun 06 ― June 2 Arizona Fireball
May 30 ― Cloudzilla
May 23 ― Shelf Clouds
May 16 ― May 22, 2016 Mars Opposition
May 09 ― Q&A: Synchronous Lunar Rotation
May 02 ― May 9, 2016 Transit of Mercury
Apr 25 ― An Illusion Caused by Perspective
Apr 11 ― Q&A: Lake Effect Snow
Apr 04 ― Q&A: Why the Equinox Isn’t
Mar 28 ― Science and Art
Mar 21 ― What LIGO Detected
Mar 14 ― Q&A: What LIGO Proved
Mar 07 ― Blue Snow
Feb 29 ― Q&A: Leap Day Explained
Feb 22 ― Q&A: Communicating Science with ET
Feb 15 ― Q&A: Talking to ET
Feb 08 ― The Palettes of Sunset
Feb 01 ― Grand Alignment Photo
Jan 25 ― Moon and Five Planets in the Morning
Jan 18 ― Sky Lore of the Hopi Tribe
Jan 04 ― Q&A: Why There Are Leap Years
Dec 21 ― Q&A: Santa’s Sleigh Sighted?
Dec 14 ― Q&A: Buying Your First Telescope
Nov 30 ― Q&A: Contrails vs. Chemtrails
Nov 16 ― Not All Clouds Have Silver Linings
Nov 09 ― Virtual Reality Astronomy
Nov 02 ― Smashing the Crystalline Sphere
Oct 26 ― Triple Conjunction in the Morning
Oct 19 ― The September 2015 Lunar Eclipse
Oct 12 ― Q&A: Why Jupiter Doesn’t Condense
Oct 05 ― The Longest Moonrise
Sep 28 ― Q&A: Geosynchronous Satellites
Sep 21 ― 2015 Harvest Moon Total Eclipse
Sep 14 ― The Shape of Thunderstorm Clouds
Sep 07 ― The Lake Pleasant Rain Engine
Aug 31 ― Sunset in the East
Aug 24 ― Q&A: Earth’s Other Moons
Aug 10 ― The 2015 Perseid Meteor Shower
Aug 03 ― Sun Pillar Sunset
Jul 27 ― Q&A: Why Distant Mountains Look Blue
Jul 20 ― New Horizons Reaches Pluto – Part 2
Jul 13 ― Earth’s Shadow Rising
Jul 06 ― New Horizons Reaches Pluto – Part 1
Jun 15 ― Serene Sunrise Sequence
Jun 01 ― Q&A: Another Wisconsin Aurora
May 25 ― Circular Rainbows
May 18 ― May 22 Saturn Opposition
May 11 ― Fallstreak Holes
May 04 ― Altostratus Undulatus Captured
Apr 27 ― Q&A: Which Direction is Up
Apr 06 ― Q&A: Wisconsin Aurora
Mar 30 ― April 4, 2015 Lunar Eclipse
Mar 23 ― The Brightest Trio in the Sky
Mar 16 ― Q&A: Lowest Possible Lunar Orbit
Mar 09 ― Corkscrew Contrail
Mar 02 ― Strange Cloud Explained
Feb 23 ― Fog to Smog
Feb 16 ― February 20, 2015 Triple Conjunction
Feb 02 ― Q&A: Burning a Hole Through a Cloud
Jan 26 ― Leap Seconds
Jan 12 ― Comet Lovejoy in January 2015
Dec 29 ― Q&A: Santa’s Sleigh Sighted?
Dec 22 ― Q&A: The Winter Solstice
Dec 15 ― Q&A: Your Cosmic Address
Dec 08 ― The Orion Launch: December 5, 2014
Dec 01 ― Q&A: Red Rainbows
Nov 24 ― Star Hopping to Neptune
Nov 17 ― ESA Comet Landing
Nov 10 ― Q&A: Why Clouds Have Colors
Nov 03 ― Same Eclipse, Three Takes
Oct 27 ― Unusual Cloud #592
Oct 20 ― Partial Solar Eclipse on October 23
Oct 13 ― Q&A: Transient Lunar Phenomena
Oct 06 ― Total Lunar Eclipse on October 8
Sep 29 ― 2014 Conjunction of Mars and Antares
Sep 22 ― Q&A: To See the Southern Cross
Sep 15 ― Harvest Moon Rising
Sep 08 ― Harvest Moon on September 9
Sep 01 ― Touch a Star
Aug 25 ― The Time of Sunrise and Sunset
Aug 18 ― How to Use a Telescope
Aug 11 ― Poetry for Stargazers
Jul 28 ― What Causes Thunder
Jul 21 ― What Causes Lightning
Jul 14 ― Q&A: The Arizona Monsoon
Jun 30 ― Orographic Volcano
Jun 23 ― Saguaro Moonrise
Jun 16 ― Q&A: Meteor Showers and the ISS
Jun 09 ― Camelopardalid Bust
Jun 02 ― Q&A: Why Fireflies Synchronize
May 26 ― The World’s Oldest Profession
May 12 ― Saturn at Opposition on May 10
Apr 28 ― GMT vs. UTC
Apr 21 ― Equinox Sunset
Apr 14 ― Total Lunar Eclipse
Apr 07 ― Mars at Opposition
Mar 31 ― One Weird Cloud
Mar 24 ― Q&A: Catching a Ball on the Moon
Mar 17 ― The 2014 Vernal Equinox
Mar 10 ― Q&A: Throwing a Ball to the Moon
Mar 03 ― Gems in the Sky
Feb 24 ― Q&A: Exoplanets
Feb 17 ― NASA’s Most Famous Photo
Feb 10 ― Q&A: The Fastest Rocket
Feb 03 ― Earth and Sky Divided
Jan 27 ― Conjunction of Mercury and the Moon
Jan 20 ― More Pink Snow
Jan 13 ― Very Young Moon
Jan 06 ― Jupiter at Opposition
Dec 23 ― Q&A: Santa’s Sleigh Spotted?
Dec 16 ― Waterfall in the Sky
Dec 09 ― The Brightest Things in the Sky
Dec 02 ― Q&A: Fire in the Sky
Nov 25 ― Comet ISON in December 2013
Nov 18 ― Venus in Sagittarius
Nov 11 ― Q&A: How to Find the ISS
Nov 04 ― How to Find the Sun
Oct 28 ― Venus at Greatest Elongation
Sep 30 ― Updrafts and Cloud Formation
Sep 23 ― The International Dateline Explained
Sep 16 ― Q&A: Where the Sun Goes at Night
Sep 09 ― Quintuple Conjunction in the West
Sep 02 ― An Optical Puzzle: Solved
Aug 26 ― Q&A: How Altimeters Measure Altitude
Aug 19 ― Q&A: Water in the Atmosphere
Aug 12 ― Light and Color at Sunset
Aug 05 ― The 2013 Perseid Meteor Shower
Jul 22 ― Q&A: Barometric Air Pressure
Jul 15 ― Q&A: What Causes Tides
Jul 08 ― The Hubble XDF
Jul 01 ― Q&A: Where Stars Come From
Jun 24 ― Q&A: What Clouds Are
Jun 17 ― Saguaro Sunset
Jun 10 ― Saturn in Virgo
Jun 03 ― Q&A: Consequences of Light Pollution
May 27 ― Music From Space
May 20 ― How Telescopes Work – Part 2
May 13 ― Fake Sunrise
Apr 29 ― Q&A: The Meaning of Visibility
Apr 22 ― Sunset on Mars
Apr 15 ― Q&A: Seeing Earth from Space
Apr 08 ― How Telescopes Work – Part 1
Mar 25 ― Terrestrial Earthshine
Mar 18 ― Q&A: The Setting Crescent Moon
Mar 11 ― Q&A: Why February has 28 Days
Mar 04 ― Q&A: St. Elmo’s Fire Explained
Feb 18 ― Meteor Explodes Over Russia
Feb 11 ― Massive Aurora Seen From Space
Feb 04 ― Atmospheric Extinction
Jan 28 ― See Elusive Planet Mercury
Jan 21 ― Jupiter in Taurus
Jan 14 ― Winter Solstice Rainbow
Dec 31 ― Q&A: Buying and Naming Your Own Star
Dec 24 ― Q&A: Santa’s Sleigh Spotted?
Dec 17 ― Q&A: The Winter Solstice
Dec 10 ― The Geminid Meteor Shower
Dec 03 ― Q&A: Seeing the Sun Safely
Nov 26 ― Triple Feature in the East
Nov 19 ― The Big Moon Photo Hoax
Nov 12 ― How the Moon Changes
Oct 15 ― Evolution of a Sunset
Oct 08 ― Sky Lights #200!
Sep 24 ― Young Moon
Sep 17 ― The Colors of Rain
Sep 10 ― Q&A: The Terminator
Sep 03 ― Blue Moon Rising
Aug 27 ― Q&A: Blue Moon
Aug 20 ― The Geometry of Transits
Aug 06 ― Why Some Clouds Resemble Things
Jul 30 ― The Blue Marble
Jul 23 ― Proof We Went to the Moon
Jul 16 ― Q&A: Orange Moon Rising
Jul 09 ― Q&A: Global Warming
Jul 02 ― Q&A: Linear Orbits
Jun 25 ― The June 4th Partial Lunar Eclipse
Jun 18 ― Q&A: Why Orbits are Not Circular
Jun 11 ― Q&A: Observing the Sun Safely
Jun 04 ― The June 5-6, 2012 Transit of Venus
May 28 ― The May 20, 2012 Annular Eclipse
May 21 ― Q&A: Super Moon
May 14 ― May 20, 2012 Solar Eclipse
May 07 ― Q&A: Why Stars Twinkle
Apr 30 ― Iridescent Clouds
Apr 23 ― Light & Shadow: Sunrise on the Moon
Apr 16 ― Pink Snow?
Apr 09 ― Q&A: How They Steer Hot Air Balloons
Apr 02 ― Q&A: Venus at Greatest Elongation
Mar 26 ― Circumpolar Constellations
Mar 12 ― Electronic Billboards
Mar 05 ― Double Rainbows
Feb 27 ― My Worst Astrophotograph (So Far)
Feb 20 ― Q&A: The Aurora
Feb 13 ― The Hunters and the Hunted
Feb 06 ― Q&A: Lenticular Clouds
Jan 30 ― Earth at Perihelion
Jan 23 ― My Brightest Ever Sun Dog
Jan 16 ― Q&A: Smog and Inversions
Dec 26 ― Q&A: Leap Year in 2012
Dec 19 ― Q&A: Santa’s Sleigh Spotted?
Dec 12 ― What Earth Looks Like from the Moon
Dec 05 ― The Seven Sisters
Nov 28 ― Q&A: Full Moon with Corona
Nov 21 ― Q&A: The Evening Star
Nov 14 ― Light Pollution of a New Kind
Nov 07 ― Eye – Brain – Hand
Oct 31 ― Spooky Things in the Sky
Oct 24 ― How Dark Is Your Sky?
Oct 17 ― Q&A: Why There Are No Green Stars
Oct 10 ― Q&A: Sun Dogs Again
Oct 03 ― Q&A: Apollo 18
Sep 26 ― Q&A: Highway Mirages
Sep 19 ― The Autumnal Equinox
Sep 12 ― Wind Curl & Divergence
Sep 05 ― Q&A: The Face on Mars
Aug 29 ― Dust Storms
Aug 22 ― Planet vs. Star
Aug 15 ― Q&A: Meteors Seen from Space
Aug 08 ― The Perseid Meteor Shower
Aug 01 ― Rain is a Local Phenomenon
Jul 15 ― How a Sunset can be Violet or Indigo
Jul 08 ― Why Some Sunsets are Not Red
Jul 01 ― Why Most Sunsets are Red
Aug 15 ― Crepuscular Rays + Silver Linings
Aug 01 ― Q&A: Silver Linings
Jul 15 ― The Summer Triangle
Jul 01 ― Scorpion on the Meridian
May 15 ― Q&A: Rain that Doesn’t
May 01 ― Q&A: Polar Satellites
Apr 15 ― Q&A: The Total Number of Stars
Apr 01 ― Q&A: Crepuscular Rays
Mar 15 ― Q&A: Canines Howling at the Moon
Mar 01 ― Q&A: The Distance to Space
Feb 01 ― Q&A: Dust Devils
Jan 15 ― Q&A: Weather Balloons Revisited
Jan 01 ― Q&A: Strange Trails in the Sky
Jun 15 ― Q&A: The Meaning of Ceiling
Jun 01 ― Q&A: The Analemma
Mar 15 ― The Vernal Equinox
Mar 08 ― Q&A: Weather Balloon Sighting
Mar 01 ― Good Dog, Want a Treat?
Feb 15 ― Triple Planetary Conjunction
Feb 08 ― Q&A: The Shape of Lightning Bolts
Feb 01 ― Far Out February Fireworks
Jan 15 ― The Big Fish
Jan 08 ― Red Planet Rising
Jan 01 ― Q&A: Holiday Lights vs. Astronomy
Dec 28 ― The Age of Aquarius
Dec 21 ― Q&A: Santa’s Sleigh
Dec 14 ― The Winter Solstice
Nov 15 ― Q&A: Silver Linings on Clouds
Nov 01 ― Q&A: Desert Dust
Oct 25 ― The Great Galaxy in Andromeda
Oct 01 ― How to Find the Nearest Galaxy
Sep 15 ― Q&A: Virga
Sep 08 ― Q&A: Twinkle Twinkle Little Star
Sep 01 ― Q&A: Why Stars Shine
Aug 15 ― Three Easy Stars
Aug 08 ― Q&A: Pigs Can Fly!
Aug 01 ― Jupiter is Looking Good
Jul 22 ― Q&A: Heat Lightning
Jul 15 ― Scorpion on the Meridian
Jul 08 ― Q&A: The Sun is a Star
Jun 29 ― Summer Triangle Rising
Jun 15 ― Conjunction of Saturn and Venus
Jun 01 ― Why the Year is One Year Long
May 23 ― Q&A: Dust Devils
May 16 ― Venus as the Evening Star
Apr 22 ― Q&A: Weird Sky in Cabo
Apr 15 ― Winter Setting
Apr 08 ― Q&A: False Sun
Apr 01 ― Far South on the Sphere
Mar 15 ― Q&A: Egg Balancing on the Equinox
Mar 01 ― Q&A: Sun Pillars Revisited
Feb 15 ― Q&A: Earthshine
Feb 01 ― Q&A: The Great Moon Hoax (Not)
Jan 15 ― Q&A: Earth at Perihelion
Jan 01 ― Q&A: Starting the New Year
Nov 22 ― Q&A: Stars vs. Planets
Nov 15 ― The Invisible Crane
Nov 08 ― Q&A: Leonid Meteor Shower
Oct 25 ― Q&A: Iridium Flare
Oct 18 ― Light Pollution Test
Oct 11 ― Q&A: Sun Dogs
Oct 04 ― Hercules – A Closer Look
Sep 27 ― Q&A: Pluto Demoted to Dwarf Planet
Sep 13 ― Q&A: Sun Pillars
Sep 06 ― Harvest Moon
Aug 30 ― Can You Find the Milky Way?
Aug 23 ― Q&A: Lightning Hazard!
Aug 09 ― Q&A: Perseid Meteor Shower
Aug 02 ― Morning Star Rising
Jul 26 ― Q&A: Night Lights Problem
Jul 12 ― Q&A: Sunset and Twilight
Jul 05 ― Jupiter on the Meridian
Jun 14 ― Double Star in Cygnus
Jun 07 ― Q&A: Canines and the Moon
May 31 ― Conjunction of Mars and Saturn
May 24 ― The Not-So-Mighty Hercules
May 17 ― Q&A: Why They Call it Space
May 10 ― Saturn and Mars in Gemini
May 03 ― Q&A: Desert Foothills Astronomy Club
Apr 19 ― Q&A: Daylight Saving Time
Apr 05 ― Q&A: Problems with a New Telescope
Mar 29 ― The Perpetual Race
Mar 01 ― Lion on the Prowl
Feb 22 ― Q&A: Sky Lights Slogan
Feb 15 ― Saturn Displays its Rings
Feb 08 ― Q&A: New Angle on M31
Jan 11 ― Q&A: Perihelion Explained
Dec 28 ― The Ultimate Answer …
Nov 23 ― Q&A: UFO
Nov 16 ― Mouth of the Fish
Nov 09 ― Q&A: Mars Close to Earth
Nov 02 ― Venus Shines in Sagittarius
Oct 12 ― Q&A: The Size of the Universe
Sep 28 ― Q&A: What a Black Hole Looks Like
Sep 21 ― Test Your Eyesight on Alcor
Sep 07 ― The Elusive Little Dipper
Aug 31 ― Q&A: Sundials vs. Moondials
Aug 17 ― The Teapot Simmers
Aug 03 ― To Twinkle or Not
Jul 27 ― Q&A: Polar Satellites
Jul 13 ― Q&A: Light Pollution Defined
Jul 06 ― Two Inferior Planets Visible
Jun 22 ― Q&A: Summer Solstice
Jun 08 ― Q&A: The Moon Illusion
May 18 ― Q&A: Buying a Star
May 11 ― Q&A: Retrograde Explained
May 04 ― Western Double Feature
Apr 27 ― Q&A: No Telescope? No Problem.
Apr 20 ― Jupiter as a Celestial Clock
Apr 13 ― Q&A: Jupiter Getting Brighter
Apr 06 ― Three Easy Objects
Mar 30 ― How to Find the North Star
Mar 23 ― Q&A: Ring Around the Moon
Mar 02 ― The Double Cluster
Feb 23 ― Q&A: Huygens Probe Dropped on Titan
Feb 16 ― The Hunters and the Hunted
Feb 09 ― Q&A: Light Year Defined
Feb 02 ― Cepheus the King
Jan 26 ― The Southern Cross
Jan 19 ― Triple Feature in the East
Jan 12 ― Q&A: Big Dipper Visibility
Dec 29 ― Orion the Hunter
Dec 22 ― Q&A: Origins of Celestial Names
Dec 01 ― The Seven Sisters
Oct 27 ― Q&A: Weird Moon Phase
Oct 20 ― Lunar Eclipse
Oct 13 ― Q&A: Rare Moonrise Apparition
Sep 08 ― Q&A: What the Milky Way Really Is