Mars and Saturn over the Alps

Mars is the brightest "star" in this image, in the lower right. Saturn is second-brightest, above and to the left of Mars. Plus stars in Scorpius and Ophiuchus.

Today in science: Gene Roddenberry

Happy 95th birthday to writer and producer Gene Roddenberry, creator of Star Trek.

Watch spacewalk live August 19

Two ISS astronauts will perform a spacewalk on Friday. NASA TV's live coverage starts at 6:30 a.m. EDT (10:30 UTC) and lasts about eight hours.

Quasi-conjunction of Mercury and Jupiter

Venus and Jupiter are super bright, near the sunset glare. Mercury is nearby.

How did humans first reach America?

A new study suggests that the first people to reach America travelled via the Pacific coast rather than through a corridor between two giant ice sheets.

Moon past full. How to see Neptune

Tonight's moon looks full but is already waning. This moon is near Neptune on the sky's dome. How to find Neptune when the moon moves away.

Way-cute googly-eyed stubby squid

It's purple! An underwater research team spotted this guy off the coast of California.

Atmospheric scientists say ‘no chemtrails’

Is there a large-scale, secret program to spray chemicals into Earth's atmosphere, resulting in "chemtrails?" Leading atmospheric scientists just say no.

Dumbbell nebula

Tom Wildoner got this great shot of the Dumbbell nebula. Also known as Messier 27, it’s in the constellation Vulpecula, about 1,360 light-years away.

How sunflowers follow the sun

New research on how sunflowers use their internal circadian clocks to face east in the morning and follow the sun during the day.