Related topics: nasa · stars · earth

Video: Mapping the radio sky

The Very Large Array can't image a big section of sky all at once. Instead, it must scan the sky over time.

Hubble spots double quasars in merging galaxies

NASA's Hubble Space Telescope is "seeing double." Peering back 10 billion years into the universe's past, Hubble astronomers found a pair of quasars that are so close to each other they look like a single object in ground-based ...