Cassiopeia A in X-rays

NASA / JPL-Caltech / CXC / SAO

Mapping a Supernova’s Radioactive Glow

February 21, 2014                                                                | A radioactive element produced near the heart of collapsing stars hints at the mechanism behind Cassiopeia A’s supernova explosion. > read more

The Purest Star Tells an Ancient Tale

February 20, 2014                                                                | Astronomers have discovered the purest star to date. Composed almost exclusively of hydrogen and helium — with 15 million times less iron than our Sun — it illuminates what happened among the first supernovae in the early universe.  > read more

Hot White Dwarfs Show Planet Debris

February 16, 2014                                                                | Both hot and cool white dwarf stars can display the remains of destroyed planets polluting their atmospheres. There now appear to be two routes for this material to make its way in. > read more

Red Sky for Brown Dwarf

February 19, 2014                                                                | Astronomers have discovered a new “failed star” with unusually red, dusty skies. The dust makes the object look much younger than it actually is, complicating studies of this type of brown dwarf. > read more


Take a Moon Walk Tonight

February 18, 2014                                                                  | Explore the Moon with binoculars or a telescope. > read more

Supernova in M82 Passes Its Peak

February 14, 2014                                                                | Supernova 2014J, in the galaxy M82 in Ursa Major, peaked at magnitude 10.5 in early February and is now down to 11.2. Spot it with your telescope above the Big Dipper. > read more

Tour February’s Sky by Eye and Ear!

January 31, 2014                                                                  | Jupiter is well up in the east as darkness falls, surrounded by a cohort of bright winter stars and constellations. > read more

This Week’s Sky at a Glance

This Week’s Sky at a Glance

February 21, 2014                                                                  | Capella and Rigel march in step across the meridian after dusk, and the waning Moon passes more planets at dawn. > read more

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