It isn't as famous as its counterpart, the Southern Cross. But the Northern Cross looks like a cross, and it's pretty easy to spot. You'll find it upright in the west on late December evenings.

A popular theory of galaxy formation suggests that small galaxies merged to form larger ones. But galaxy C1-23152 - 12 billion light-years from Earth - apparently formed itself from gas in the early universe, via exceedingly rapid star formation.

A new study from researchers at Rutgers University suggests that the best place to look for evidence of life on Mars is deep underground, where geothermal heat melted subsurface ice.

The Large Magellanic Cloud dwarf galaxy, visible all year round in the Southern Hemisphere, is somewhere between spiral and irregular in shape.

Dreaming of a white Christmas? Here's a map depicting which places in the US have the best chance of being snowy on Christmas Day 2020.

EarthSky community members from around the world share their photos and experiences of this year's Geminid meteor shower, here.

Most Unidentified Flying Objects aren't actually unidentified. Here's a list of phenomena, either natural or human-made, that people often mistake for UFOs.

Early ice retreat amid warm Arctic air temperatures set the stage for the slow refreeze in 2020.

During a total solar eclipse, the moon's shadow sweeps across Earth. Those in the shadow's path see the total eclipse. Those outside the path of the shadow may see varying stages of a partial eclipse.

The 2 bright shining objects near the moon - December 15 to 18, 2020 - will be Jupiter and Saturn. These 2 giant planets are now nearing their great conjunction on December 21. Don't miss this!