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6 March 2014 1:04 pm ,
Vol. 343 ,
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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What Gave an Asteroid Its Own Moon?
27 February 2014 4:15 pm
After 8 years of observing Hektor—the only known asteroid with its own moon—astronomers believe they’ve finally figured out more about its geology and orbit. In a study published online today in The Astrophysical Journal Letters, the team suggests that the asteroid is 250 kilometers wide and made of a mixture of rocks and ice, while the moon is 12 kilometers wide and orbits the asteroid every 3 days at 200 kilometers per hour. The team believes the unique pair may have formed after a collision between two icy asteroids.
See more Signal/Noise.