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10 April 2014 11:44 am ,
Vol. 344 ,
The Pyrenean ibex, an impressive mountain goat that lived in the central Pyrenees in Spain, went extinct in 2000. But a...
Tight budgets are forcing NASA to consider turning off one or more planetary science projects that have completed their...
Ebola is not a stranger to West Africa—an outbreak in the 1990s killed chimpanzees and sickened one researcher. But the...
In an as-yet-unpublished report, an international panel of geoscientists has concluded that a pair of deadly...
Tropical disease experts tried and failed before to eradicate yaws, a rare disfiguring disease of poor countries. Now,...
Since 2002, researchers have reported that agricultural communities in the hot and humid Pacific Coast of Central...
Balkan endemic kidney disease surfaced in the 1950s and for decades defied attempts to finger the cause. It occurred...
- 10 April 2014 11:44 am , Vol. 344 , #6180
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ScienceShot: Moons as Big as Earth? Not Yet
11 January 2013 12:30 pm
Can a moon be as large as Earth? If so, it might support life. Our solar system's biggest moon—Jupiter's Ganymede—is only 41% of Earth's diameter, but other solar systems could sport larger satellites (artist's conception shown). Now, as astronomers report in work submitted to The Astrophysical Journal, they've used data from NASA's Kepler spacecraft to study seven planet-hosting stars, finding no moons at all. For four of the planets, the data are sufficiently good to rule out moons as small as Earth. The result suggests that Earth-sized moons are rare, but the sample is tiny—and so the search for supermoons will continue.
See more ScienceShots.