NASA's Dawn spacecraft will arrive at the main-belt asteroid Vesta tomorrow (July 15). Space scientists say the spacecraft is performing normally at this time.
What causes a monster black hole at a galaxy's heart to turn on and begin radiating powerfully? European astronomers suggest a reason besides galaxy collisions.
Researchers drag a green laser light by slowing it down in a ruby crystal and then spinning it at 3,000 rpm. Read more about the ability to drag light.
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