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Cosmology

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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.

illustration of galaxy dust

DISTANT DUST  Observations from an array of telescopes in Chile show that a distant, young galaxy (illustrated above) is filled with dust probably produced by the first supernova explosions in the universe.

Abell 2744

LIGHTEN UP  Some of the faintest, most distant galaxies detected to date (arcs) appear in this Hubble Space Telescope image of the massive galaxy cluster Abell 2744. The cluster acts as a gravitational lens, magnifying light from galaxies much farther away.

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