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6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
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...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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ScienceShot: World of Fire
3 July 2013 1:00 pm
Cratered Mercury (inset) won't win any beauty prizes, but it sure had a colorful past. Thanks to the Messenger spacecraft, which began orbiting the world in March 2011, planetary scientists have been able to count craters over Mercury's entire surface. The crater counts help gauge the age of different terrains, because older regions have suffered more impacts. In the main image, the most heavily cratered regions—such as the one surrounded by the black contour—are colored red. By extrapolating from the moon, where Apollo astronauts retrieved rocks that scientists dated, the researchers concluded in this week's Nature that lava flooded all of Mercury 4.0 to 4.1 billion years ago; the global volcanism ended 300 to 400 million years later. This period coincides with the Late Heavy Bombardment, a torrential rain of asteroids that pummeled the planets, suggesting the collisions may have triggered the widespread lava flows that marked Mercury's youth.
See more ScienceShots.