Astronomers have found a unique trait of spiral arms that supports a longstanding idea about where these patterns come from.
Two of the 2016 Kavli Prize laureates, Kip Thorne and Rainer Weiss, discuss the struggle to detect gravitational waves and how their discovery is changing our understanding of the universe.
The Mars Reconnaissance Orbiter is still going strong after a decade. It’s easy, but wrong, to take this mission for granted.
Take the twilight challenge and find the super-thin crescent Moon near Jupiter and Venus, then watch the Moon grow and pass Saturn and Mars.
Enjoy Orion in Shirtsleeves
Throw open the door and welcome back Orion at dawn. The Hunter’s return brings relief from the heat and gives us a fresh shot at exploring winter deep-sky objects in comfort.
You can’t get rid of noise in your astrophotographs, but S&T contributing editor Jerry Lodriguss tells you how you can reduce noise’s impact with more signal.
Early evening features Mars and Saturn toward south, but keep an eye out for brilliant Venus climbing up from the west during twilight.
September 1st’s annular solar eclipse, visible over south-central African and parts of the Indian Ocean, was a dazzling crowd pleaser.