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Sun
Sun activity: Earth’s shadow photobombs the sun
Sun activity for January 29, 2023: The sun is quiet. But we're now in SDO's 3-week eclipse season. Once a day, Earth's shadow blocks SDO's view of the sun.
January 30, 2023
Tonight
Moon occults Mars tonight
On the night of January 30-31, 2023, the waxing gibbous moon occults - or covers - the red planet Mars. Details here - how to see if - what to expect.
Tonight
Moon near Mars January 30 and 31
On the nights of January 30 and 31, 2023, watch for the moon near red Mars from dusk until after midnight. The bright red star Aldebaran is also nearby.
January 30, 2023
Astronomy Essentials
The moon’s terminator line divides night and day
The moon’s terminator line divides day and night on the moon. As we see it from Earth, it marks the line of lunar sunsets or sunrises. Read more.
January 29, 2023
Space
Webb observes Chariklo’s rings during occultation
NASA's Webb telescope took its 1st look at tiny asteroid Chariklo's rings, showing they contain water ice. Webb used a stellar occultation to observe the rings.
January 29, 2023
Today's Image
January’s deep sky: Nebulae, clusters and more
Enjoy these January photos of the deep sky, including the majestic Thor's Helmet, taken by members of the EarthSky community.
January 28, 2023
Space
New Milky Way survey reveals billions of objects
Astronomers at NOIRLab, using the Dark Energy Camera in Chile, have released a new Milky Way survey showing billions of objects in the galactic plane.
January 27, 2023
Astronomy Essentials
What is the Milky Way? It’s our home galaxy
When someone says "Milky Way," do you think of the starry pathway across our sky, or of the great pinwheel-shaped galaxy in space? Both are correct!
January 27, 2023
Spaceflight
Starship aced a critical fueling test this week
SpaceX's Starship completed a milestone fueling test this week: 10 million pounds (4.5 million kg) or so of liquid fuels loaded into the stacked spacecraft.
January 27, 2023
Astronomy Essentials
Comet 2022 E3 ZTF closest to Earth February 1 and 2
The green comet - Comet 2022 E3 (ZTF) - will be closest to Earth on February 1 and 2. It's prime time to view this comet, which might be the brightest of 2023.
January 27, 2023
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