Countdowns

Not every mission to Mars has been successful.

A brief look at how each American president helped shape and steer American activities in space.

Explore the top 16 places to witness the breathtaking annular 'ring of fire' solar eclipse on Oct. 2, 2024. Plan an unforgettable eclipse experience with these expert recommendations.

Planetary scientists have been searching the cosmos for liquid water. Here are the most promising water worlds in the solar system and beyond.

Solar eclipses have captivated humans for millennia. Here we look at iconic photos through the decades of people enjoying the celestial phenomenon.

A total solar eclipse is coming on April 8, 2024, but how much do you really know about it?

The total solar eclipse of 2024 will be visible across Northern America on April 8. It could be the best eclipse for hundreds of years. Here's why.

Plan your eclipse trip with these maps of the 2024 total solar eclipse's path of totality through Mexico, the U.S. and Canada.

If you thought you knew all there is to know about the moon, think again. Here are 10 cool facts about Earth's lunar neighbor.

On October 14, 2023, the Americas will experience a partial solar eclipse, but from only eight U.S. states will it be possible to see the 'ring of fire' annular solar eclipse.