- News Home
6 March 2014 1:04 pm ,
Vol. 343 ,
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...
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...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
- About Us
ScienceShot: Asteroid Vesta Emerges
14 July 2011 1:49 pm
With NASA's release today of the latest image from the approaching Dawn spacecraft, asteroid Vesta is no longer a fuzzy, nearly featureless ball; it's a surprisingly youthful world, geologically speaking, sporting still-mysterious features. Although Dawn will go into close orbit around 529-kilometer-diameter Vesta this weekend, the newly-released image of the asteroid—taken 9 July from a distance of 41,000 kilometers—already reveals never-before-seen detail that has planetary scientists scratching their heads. Hubble Space Telescope had already revealed the peak or mound in the left-center; it marks the heart of an enormous impact crater spanning 460 kilometers (apparently hard to see from this perspective). But there are also roughly parallel ridges, grooves, or who knows what that swirl across the lower part of the image. And then there is what's missing: innumerable smaller impact craters accumulated over the eons. Dawn's year-long visit could show whether the humongous impact obliterated them as it wiped Vesta's geological slate clean.
See more ScienceShots.