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What makes the night sky dark?
On any clear evening, you can see the curved line of Earth's shadow ascending in the eastern sky. Earth's own shadow makes the night sky dark.
October 9, 2009
NASA mission that bombarded the moon
The goal of the NASA LCROSS mission was to explore a source of hydrogen at a crater at the moon's south pole, where scientists suspected the water ice.
October 9, 2009
Saturn has solar system’s biggest ring around it
The ring has a diameter equivalent to 300 Saturns lined up side to side. It’s also thick - some Saturn could fit into its vertical height 20 times.
October 7, 2009
Mars and Europa best suited for microbial life
Mars and Europa appear to be best suited for life. Will greater understanding of what makes planets habitable by microbes lead to the discovery of life on other worlds?
October 5, 2009
Alan Boss: Universe could have lots of Earth-like planets
Alan Boss says the universe could be crowded with rocky planets like Earth - some possibly with water, and even life. Amazing!
October 5, 2009
Two galaxies being stripped of gas and dust
Two galaxies in the Virgo cluster 60 million light-years away are being stripped of gas by a process akin to the wind you feel in your face when bicycling.
September 30, 2009
Scientists can see Mars in 3-D from lander photos
New computer system generates 3-D views of Mars from the Mars Exploration Rovers Spirit and Opportunity photos, enabling virtual tours for scientists.
September 24, 2009
Is there a pulsar at the center of our galaxy?
There appears to be a pulsar - a rapidly spinning dead star - located about a light-year from the black-hole center of our galaxy.
September 23, 2009
GD 50, a runaway star, maybe from Pleiades
GD 50 was born in the Pleiades star cluster, then was flung out, possibly after passing too close to another star. It's known as a runaway star.
September 17, 2009
Portrait of Andromeda Galaxy in ultraviolet
If you were on a planet orbiting a star in this Andromeda Galaxy, and could look back our Milky Way galaxy, it's thought our home galaxy would look a lot like this.
September 16, 2009
