During the Cosmic Dark Ages, our universe matured from a primordial soup of neutral gas to the star-filled cosmos we see today. A new study probes this mysterious time.
Is there an unknown, massive planet on the fringes of our solar system? New work that claims to remove "observational bias" also supports this very exciting possibility.
This star is just a sliver larger than Saturn, not even the largest planet in our solar system. Yet it's massive enough to shine as a star, and its pull of gravity is some 300 times stronger than Earth's.
Although the Cassini spacecraft - now on the verge of running out of fuel - is in its final year in orbit around Saturn, it's still producing heart-stirring images.
In hot Houston, the telescope hangs in historic Chamber A at Johnson Space Center, with the best air conditioning available. It'll soon receive a last test of its ability to withstand the cold of space.
New video shows 6 hypervelocity stars, zipping from Milky Way center to outskirts. An interaction with our galaxy's central, supermassive black hole might have kicked them into fast motion.
A recent survey revealed 1 brown dwarf for every 2 stars in the star cluster RCW 38 and other clusters. "There are a huge number of brown dwarfs out there," astronomers said.