For more than 50 years, we’ve been eavesdropping on the cosmos, searching for transmissions that would reveal the existence of intelligent, extraterrestrial life.
An unidentified blast of powerful X-rays suggests something violent is happening at the core of the galaxy—but astronomers aren’t sure what it is.
Our sun has only been around for 4.5 billion years — which means it missed the cute early years of the Milky Way galaxy. If you were standing on a planet 10 billion years ago, when the Milky Way was relatively young, the night sky would have looked very different.
New observations may finally reveal the identity of a mystery object circling around the monster black hole at the center of our Milky Way galaxy — or not.