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Image: A strange ring galaxy

(PhysOrg.com) -- Is this one galaxy or two? Astronomer Art Hoag first asked this question when he chanced upon this unusual extragalactic object.

Aug 27, 2010
4.6 / 5 (17) 21

Intense Star Formation in the Early Universe

(PhysOrg.com) -- Distant galaxies are not only far away in space. Because it takes time for their light to reach us, they are also very far away in time -- snapshots from the distant past.

Apr 02, 2010
4.8 / 5 (9) 1 | with audio podcast