When I asked readers on social media for suggestions about the coolest things they’ve seen in spaceflight during the last 25 years, I received hundreds of suggestions. To the best of my knowledge, not ...

One of the many advantages of being in space is having a front-row seat to the most anticipated cosmic events. NASA astronaut ...

From arachnid-like formations and mysterious blobs to an underground ocean and a giant volcano, here are our 10 favorite things scientists discovered on Mars this year.