EarthSky

Spring on Mars brings explosive changes. As temperatures rise, the Martian northern hemisphere experiences dramatic events such as frost avalanches, carbon dioxide gas geysers, and winds reshaping polar ice caps

View larger. | An example of weird, dark streaks called recurring slope lineae on the slopes of Mars’ Horowitz crater. Do liquid water brines form these streaks? A new study

View larger. | NASA’s Juno spacecraft captured this view of Io on December 30, 2023. A new NASA study suggested Io doesn’t have a global subsurface ocean of magma. Rather,

View larger. | Artist’s illustration of TRAPPIST-1 b as it is about to pass behind its red dwarf star. A new study suggested that TRAPPIST-1 b is either airless but

View at EarthSky Community Photos. | Abhijit Patil in Big Sur, California, captured Comet A3 near the Milky Way on October 22, 2024. Thanks, Abhijit! The comet was one of

The European Space Agency (ESA) has announced its 2025 calendar, featuring the best images from the Hubble and Webb telescopes from the past year. And it’s free for you to

Solstices and equinoxes The December solstice (winter for the Northern Hemisphere, summer for the Southern Hemisphere) will take place at 9:21 UTC on December 21, 2024. That’s 3:21 a.m. CST.

View larger. | This elevation map depicts the South Pole-Aitken basin on the moon. It is the moon’s largest crater. The lowest regions are in blue and purple. A new

Parker Solar Probe will make humanity’s closest approach to the sun on Christmas Eve, December 24! For the latest, watch the livestream above at the RESCHEDULED time of 1:15 p.m.

The Ingenuity Mars helicopter, as imaged by the Perseverance rover. This helicopter was the first aircraft to accomplish powered, controlled flight on another planet. Its original goal had been 5