Solar System

On Dec. 17, 2012, NASA's GRAIL mission crashed into the moon.

Wednesday, Dec. 17, 2025: Your daily feed for the holiday flyby of interstellar comet 3I/ATLAS by Earth.

Dr. Larry Denneau of the University of Hawaii is nothing like your typical astronomer.

New measurements demonstrate that smoke particles in the upper atmosphere are twice the size of lower-altitude ones.

NASA's Parker Solar Probe captured solar material looping back to the sun, revealing how it recycles magnetic energy and shapes future solar storms.

The direction, distance and motion of the comet through the sky during its closest approach could have made it seem like it was hovering over Bethlehem when Jesus was said to have been born.

The interstellar comet will pass safely by Earth, giving astronomers their best chance to study it up close.

Scientists have created the first detailed maps of the sun's atmospheric boundary, where solar material breaks free and streams into space.

Anomalous amounts of volatile elements found in the Apollo samples brought back from the moon have been traced back to our own planet's leaky atmosphere.