Astronomers detected mysterious radio waves from the center of the galaxy that vary dramatically and seem to shut off at random. The waves' origin is unknown, so they hint at the existence of a new type of celestial object. The signal doesn't look like the kind that comes from stars, planets, or even dead stars.

A fluffy cluster of stars spilling across the sky may have a secret hidden in its heart: a swarm of over 100 stellar-mass black holes. If this finding can be validated, it will explain how the cluster came to be the way it is - with its stars spaced light-years apart, smearing out into a stellar stream stretching across 30,000 light-years.

By measuring the distance from our sun to thousands of individual pulsating stars scattered across the Milky Way, researchers have charted our galaxy on a larger scale than ever before. Their new three-dimensional map, which provides a broad view of our place among the stars, reveals the S-like structure of the Milk...

You've never seen a night sky sight quite like this. It's been one day since SpaceX launched its first 60 Starlink internet satellites into orbit, and a skywatching sleuth has already spotted them soaring across the night sky. Netherlands-based satellite tracker Marco Langbroek stunned space fans tonight (May 24) with this jaw-dropping video of dozens of Starlink satellites soaring overhead.