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Astronomers said Thursday they had found a planetary system with three super-Earths orbiting a bright, dwarf star -- one of them likely a volcanic world of molten rock. The four-planet system had been hiding out in the M-shaped, northern hemisphere constellation Cassiopeia, "just" 21 light years from Earth, a team reported in the journal Astronomy & Astrophysics. Super-Earths have a mass higher than Earth's but are lighter than gas giants like Neptune, Saturn or Jupiter.
LOS ANGELES (AP) — Coast Guard officials were still trying to determine the source of a mysterious miles-long oil slick off California's Santa Barbara County shoreline, but a scientist said Thursday that it's likely the result of naturally occurring seepage from the sea floor.