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Map of dark matter
NASA / ESA / P. Simon / T. Schrabback

Bulletin at a Glance

This Week’s Sky at a Glance

March 25, 2010 | Thanks to a huge photographic survey undertaken by the Hubble Space Telescope, cosmologists have used the distorted shapes of primordial galaxies to “weigh” the distribution of unseen matter in the early universe and confirm the existence of the mysterious “dark energy.” > read more


An Amateur’s Mercury Odyssey

March 22, 2010 | In 1998 a trio of amateur astronomers slapped a video camera on Mount Wilson’s 60-inch reflector and aimed it at Mercury. A decade later, NASA’s Messenger spacecraft rediscovered many of the surface features they found. > read more




Recurrent nova RS Ophiuchi
David A. Hardy / PPARC
March 23, 2010 | At first observers thought they’d discovered a nova — a “new star” erupting from obscurity. But astronomers quickly realized that it was a well-known, formerly well-behaved variable star suddenly gone bonkers. > read more


Mercury Takes the Spotlight

March 26, 2010 | The normally elusive innermost planet has its best apparition of the year — with dazzling Venus to point the way!! > read more


Tour April’s Sky by Eye and Ear!

March 26, 2010 | If you’ve always wanted to spot Mercury, here’s your chance. Find out where and when to look for the fleet-footed planet using this month’s audio sky tour. Host: S&T’s Kelly Beatty. (6.5MB MP3 download: running time: 6m 52s) > read more


Vesta in 2010

January 1, 2010 | Vesta was at opposition on February 18, 2010, and it shines at magnitude 7 or brighter through mid-May. > read more


A Saturn Almanac

November 12, 2008 | Spectacular Saturn is now rising shortly after dark. Click here to find printable data on the positions of Saturn’s rings and planets. > read more


Making the Most of Mars

January 25, 2010 | Mars is receding from Earth, but it’s still a fine, though small, target for telescopes. > read more


This Week’s Sky at a Glance


Inner-planet meetup
Sky & Telescope magazine
March 26, 2010 | Venus and Mercury begin their lovely early-spring pairing low in the western sunset. > read more


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