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Atom & Cosmos

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Dawn spacecraft

The Dawn spacecraft, shown firing its ion propulsion engine in this artist’s illustration, is scheduled to begin orbiting th­­e dwarf planet Ceres on March 6.

Hypervelocity star

ON THE LOOSE  Hypervelocity stars (one illustrated) travel so fast they can escape the galaxy. US 708 is the fastest known of this cohort, possibly ejected by a supernova explosion, astronomers say.

Hubble Space Telescope image of lensed supernova

Gravity from a galaxy (box) in this Hubble Space Telescope image bends light from a more distant supernova, creating four images of the exploding star (arrows).

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