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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 ...

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.