Some of the most puzzling worlds in our telescopes’ catalogs may not be worlds at all, but relics from the first instants after the Big Bang. Instead of rocky or gaseous spheres, a handful of “planets ...

"We don't have the technology now — but in 20 or 30 years, we might." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Future technology could one ...

On Sept. 14, 2015, physicists attained the long-sought goal of detecting gravitational waves, the shockwaves spewed out by such cataclysmic events as the violent merger of two black holes. Now, in the ...