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.
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.

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.

SpaceX Starlink launches for January 2023

SpaceX’s next Starlink launch for the month is currently scheduled from California at 16:15 UTC on January 31, 2023. Watch the livestream here.
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.

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.
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.

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.
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!

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.