Sequence of cool stars
NASA / IPAC / R. Hurt


The Coolest Stars Ever Found?

March 23, 2011 | Astronomers have found what could be the first-ever members of a new stellar class — “stars” with surface temperatures lower than that of a hot cup of coffee. > read more 

Best-yet Value for Universe’s Expansion

March 21, 2011 | A new study with the Hubble Space Telescope pins down the universe’s expansion rate with unprecedented accuracy. > read more 

New Insights on Lunar Swirls

March 24, 2011 | Comet impacts? Magnetic oddities? Crashed alien spaceships? Soon scientists hope to solve the longstanding mystery of bright swirls like Reiner Gamma on the lunar surface. > read more 



GLOBE at Night's 2010 results
GLOBE at Night


How Many Stars Can You See?

February 23, 2011 | Join the sixth worldwide GLOBE at Night 2011 star-counting campaign (March 22nd through April 4th), and do your part to fight light pollution! > read more 

Tour March’s Sky by Eye and Ear!

February 24, 2011 | This will be a month of transition, celestially speaking: spring and daylight-saving time arrive for northern skywatchers, Jupiter makes an exit, and Saturn is waiting in the wings. > read more 

Saturn’s New Bright Storm

December 27, 2010 | A massive new storm in the ringed planet’s northern hemisphere is bright enough to see in small telescopes. > read more 

This Week’s Sky at a Glance


Dawn view


This Week’s Sky at a Glance

March 25, 2011 | Mercury is fading in the sunset and Orion is tilting southwest on his way down, while Saturn is rising higher as it nears opposition in the eastern evening sky. > read more 



Alan MacRobert demonstrates using a star chart
S&T: Jessica Kloss


Video: Using Star Charts and Star Wheels

March 24, 2011 | Watch S&T senior editor Alan MacRobert show and explain how to use star charts and star wheels. > read more


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