Venus and Mercury were closer earlier this month, but they're easier to see now. Don't miss these 2 innermost worlds in our solar system, in the west after sunset.
NASA's Parker Solar Probe, launching this summer, will travel closer to the sun than any spacecraft yet - and you can send your name along for the ride. Hear about it from William Shatner.
A new study projects increases in burning across the U.S. West and Canada. It suggests large fires - such those we've seen recently in California - may become more common.
The long-lived Opportunity Mars rover keeps finding surprises, including these possible stone stripes. On Earth, similar features result from repeated freezing and thawing of wet soil.