New research suggests Earth was once a purple planet. Early microbes used retinal, not chlorophyll, for photosynthesis.

Four planets will be widely visible to the naked eye through part of February, but calling them a 'planetary alignment' may not be the full picture.

Sci-fi planets like Dune's Arrakis and Star Wars' Tatooine might look cool, but according to NASA they're more fiction than science.

“Sure, we'd have the same chaos problem we have in any star system, but we'd also have to keep updating our measurements of the positions of distant stars and their planets to maintain an ...

Finally, planets can take on different colors — Mars looks reddish ... But that can lead to a facade of coldness that isn't at all accurate. Since you crave intimacy, try opening up a bit.