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Astronomy

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comet 67P

DUST UP  A plume of dust (indicated by arrow) shoots from comet 67P in this image from the Rosetta spacecraft. New data show that a cliff collapsing on the comet’s surface caused the outburst.

hydrogen signatures of galaxies

SLUGGISH STARS  A hydrogen signature reveals the structure of six galaxies (top, bright regions appear red) observed with the Very Large Telescope in Chile. The signature also shows the velocities (bottom) of stars in the galaxies (blue regions are moving toward the telescope; red areas, away). Stars farther from the galactic center unexpectedly appear to move more slowly than stars closer in.

Pan in Cassini image

This week, Cassini captured the closest images ever taken of Pan, a small moon that orbits amid Saturn’s rings.

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