It came from another galaxy
It came from another galaxy.
It came from another galaxy.
It came from another galaxy.
Based on the pace of discovery, scientists expect to discover the 500th extrasolar planet by the end of October.
Two years before anyone knew there was a Earthlike planet orbiting Gliese 581 in its habitable zone, an astronomer doing work for SETI detected a single very unusual pulse of energy coming from that area in the sky.