Ever wanted to explore space, but get the willies thinking about flying in a rocket? Celestia, a free and open-source space simulator, might be just the thing you're looking for. This lightweight ...

"With this new visualization, everyone can experience this rich, captivating landscape in a new way." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. What’s better than one space telescope? Two space telescopes. NASA ...