Dark Matter Dominates Just-Discovered Galaxies
Astronomers have discovered more than 800 so-called "ultradiffuse galaxies" that are virtually invisible because they have relatively few stars and are mostly dark matter. Clara Moskowitz reports
Astronomers Propose Giant Space Telescope to Replace Hubble
A segmented mirror four or five times wider than Hubble's would peer directly at exoplanets
Hubble's Proposed Supersize Successor Generates Controversy
As the legendary space telescope enters its twilight years, astronomers are searching for a replacement, but no one agrees about what it should accomplish
As Earth's Spin Slows, Clocks Get Another Leap Second
The history of the leap second reveals a curious pattern of decreasing frequency since its adoption 43 years ago
Oddball Black Hole May Have Cosmic Cousins
Scientists might have found that an exotic astronomical object may not be so rare after all
Astronomers Glimpse a Young Jupiter, 51 Eridani b
The newfound planet is 96 light years away, but it's the closest twin to Jupiter astronomers have ever directly seen
Cosmic Turbulence May Spawn Monster Magnetic Fields
Galactic collisions replicated in the lab help researchers investigate the origins of vastly amplified magnetic fields in the universe
100 Years of Great Physics: Watch Live Monday and Tuesday [Video]
General relativity and Noether’s theorem take center stage in two live Web broadcasts this week
Astronomers Claim to Take First Glimpse of Primordial Stars
A bright galaxy may hold starts from a generation that seeded the rest of the universe
Taking the Weight of an Alien World
Making Space for Everyone: A Q&A with BoldlyGo's Jon Morse
NASA’s former director of astrophysics plans to revolutionize space science with agile, privately funded missions
Comet Dust Kicks Up Clouds over the Moon
The same particles that streak through Earth's atmosphere as "shooting stars" kick up lunar dust when they strike the surface of the atmosphere-less moon. Christopher Intagliata reports