SUNSET: 
Rejected: Spain’s Proposal to Build the Thirty Meter Telescope on La Palma
The island was the backup site for the giant telescope, whose future remains in limbo.
Astronomy in Space with David Dickinson
Jupiter Icy Moons Explorer Makes Penultimate Earth Flyby
On September 28th, Europe's JUICE mission makes another pass by home, en route to the icy moons of Jupiter.
This Week's Sky at a Glance, September 25 – October 2
Saturn comes to opposition. So does the Moon. Once the Moon is gone from the evening sky, try with your telescope for the autumn globular clusters Sagittifolia, Queen Anne's Lace, Watercress by the Stream, and Seaflower of the Deep.
NASA Selects Far-Infrared Mission PRIMA to Survey the Cool Universe
NASA has selected a new space probe for development: The PRIMA telescope will explore the far-infrared universe.
How Can a Puny Star Make a Giant Planet?
Astronomers have directly imaged a giant planet around a low-mass star — something they didn’t think was possible.
Astronomers Have Spotted the Youngest Planet Yet
A baby planet is carving out a gap in the natal disk of its star as it assembles material, providing a rare window into the earliest stages of planet formation.
Stunning Panorama Reveals Tiniest Brown Dwarfs Yet
The stellar nursery IC 348 is forming lots of stars — and some of the puniest brown dwarfs (aka, “failed stars”) we’ve ever seen.
Royal Observatory Greenwich and ZWO Present the Astronomy Photographer of the Year
The winners of the 18th annual Astronomy Photographer of the Year contest were announced on September 17th. Take a look at the winning photos.
This Week's Sky at a Glance, September 18 – 27
Every evening the waxing gibbous Moon reveals a wealth of new telescopic detail. Can you still catch Venus low in twilight as it nears conjunction? On the opposite side of the sky, Saturn nears opposition.
Join the World in Observing the Moon on September 19th
Disconnect from the digital world for a while — all you have to do is look up.
Once-in-a-Century Impact Made a “Cold Spot” on the Moon
In watching an impact's aftermath, scientists have confirmed that such large blasts shake up and cool wide swaths of the lunar surface.
Second Bright Supernova in Spiral Galaxy NGC 7331 in a Year
A familiar galaxy in Pegasus hosts a supernova bright enough to see in a 4-inch telescope.
Some Pairs of Stars Weren’t Born That Way
Two massive stars might’ve been born separately before getting tangled in each other’s orbits, revealing a new way that binaries form.
Are Moons Growing Around Exoplanet PDS 70c?
New research suggests that the circumplanetary disk surrounding the exoplanet PDS 70c contains a ring of dense dust, and the conditions within this ring may allow baby moons to form.
Scientists Found a Potential Dark Matter Particle — What Happens Now?
The recent detection from the LUX-ZEPLIN experiment could point to “heavy” dark matter.
This Week's Sky at a Glance, September 11 – 20
Very low after sunset, the crescent Moon steps past Venus from Sunday to Monday. A couple days later, it steps past higher Antares.
Webb Telescope Discovers Surprising Changes in an Asteroid’s Rings
Painstaking observations have revealed unexpected evolution in the rings around Chariklo, a tiny outer-solar-system object.
This Week's Sky at a Glance, September 4 – 13
Venus is sinking down and away. The Sagittarius Teapot pours out its tea as summer nears its end. Saturn rises around nightfall and climbs high as night grows late.
Gaps in Stellar Streams May be Common — and Not a Sign of Dark Matter
Astronomers once thought dark matter clumps had torn their way through long lines of stars — now, a new study shows that gaps in such stellar streams can arise even without dark matter.
Tuesday's Daytime Jupiter Occultation a Warm-Up for the "Big One"
A daytime occultation to whet your appetite for next month's spectacular show.