picks NASA's Juno is about to reach Jupiter after a 5-year journey. I visited JPL before the big show. Katherine Leipper

makers That UFO shot down over Alaska likely belonged to a group of amateur radio balloon hobbyists David Pescovitz

Science Mars rover stumbled on a fantastic chunky meteorite David Pescovitz

Space Truck-size asteroid will pass extraordinarily close to Earth today David Pescovitz

Space Look at this gorgeous winter wonderland on Mars David Pescovitz

Space Mars rover found a "treasure" of organic matter, possible signature of life David Pescovitz

Space Engineers fixed Voyager space probe's mysterious glitch but found another that's even stranger David Pescovitz

Voyager 1 probe is sending back mysterious signals from interstellar space David Pescovitz

Space Listen to audio recorded on Mars, where the speed of sound is slower than on Earth David Pescovitz

astronomy Are people who study Uranus annoyed by jokes about Uranus? Thom Dunn

NASA Perseverance site named Octavia E. Butler Landing Gareth Branwyn

Mars NASA hid an Easter Egg in the parachute for Perseverance Clive Thompson

moon The moon is mysteriously rusting, and scientists think it's our fault Thom Dunn

Science Later this month, look up to see Jupiter and Saturn appear closer together than they've been since the Middle Ages David Pescovitz

Science Unusual asteroid could be worth $10,000 quadrillion David Pescovitz

fires NASA monitors carbon monoxide from California and Oregon fires, finds 10x typical CO emissions Xeni Jardin

Space The next Venus rover will have a steampunk vibe Andrea James

Science Tropical Storm Fay imaged by NASA's Atmospheric Infrared Sounder (AIRS) Xeni Jardin

climate change Greenland and Antarctica melting 6x faster than in 1990s: NASA Xeni Jardin

Space Curiosity rover's 1.8 billion-pixel panorama of Mars Rob Beschizza