Sun activity: M flare from new region
Sun activity for December 4, 2022: The sun has reached moderate activity with an M1.2 flare from AR3157. Activity at Earth is quiet.
Brightest Stars
Schedar shines brightly at the Queen’s heart
Schedar is the brightest star in the distinctive W-shaped northern constellation Cassiopeia and is visible most of the year from northern latitudes.

Earliest sunset comes before winter solstice

Earliest sunset at mid-northern latitudes are happening now. What if you're in the Southern Hemisphere? Watch for your earliest sunrise.
Astronomy Essentials

2022 December solstice: All you need to know

The 2022 December solstice takes place on December 21. Northern Hemisphere's shortest day. Southern Hemisphere's longest day. Happy solstice to all!

A moment of global darkness on December 6

For just a moment on December 6, nearly 9 in 10 people worldwide experience nighttime. Read more about the moment of global darkness.

Historic Keeling Curve data offline after Mauna Loa eruption

The eruption of Mauna Loa has interrupted the historic carbon-dioxide data that measures the Keeling Curve. Read more about the Keeling Curve here.

Artemis 1 Orion craft has left moon orbit, now headed home

The Artemis 1 Orion moonship left lunar orbit on December 1, and is now headed back to Earth. Splashdown in the Pacific is due December 11.

Moon and Jupiter close on December 1

On December 1, 2022, you'll see a bright point of light close to the moon. That's Jupiter! The moon and Jupiter will pair up again at the end of the month.
Astronomy Essentials

Comet 2022 E3 now in morning skies, brightening

Comet 2022 E3 (ZTF) is now in morning skies for the Northern Hemisphere. In early 2023, it should be visible in binoculars. Learn more here.
Today's Image

Saturn’s moon Titan occults star in new images

The European Southern Observatory's Very Large Telescope captured amazing images of Saturn's moon Titan occulting a star on November 29, 2022. See the images.