- News Home
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
- About Us
Science Shot: Dawn Spies a Messed-Up Vesta
1 August 2011 2:54 pm
Two weeks after settling into orbit around Vesta, the ion-propelled Dawn spacecraft is returning stunning images of the 530-kilometer-wide asteroid. And boy is it in rough shape. An image presented today at a NASA press conference is the first whole-asteroid portrait returned from a distance of 5200 kilometers. The broad, relatively smooth expanse covering much of Vesta in this view is part of the 460-kilometer-wide crater blown into the south pole region when the impact of an 80-kilometer asteroid nearly shattered Vesta. Having been created relatively recently in solar system history, this impact basin has accumulated fewer of the smaller craters that roughen the surface to the north (top of image and in this video). More mysteriously, the region in the north is banded by parallel grooves running like lines of latitude around Vesta's equatorial region. Planetary scientists modeling a huge impact on Vesta had warned that rocky debris could pile up in some odd shapes, but nothing like this showed up in their models. Dawn will be dipping to lower and lower altitudes in coming months until it is just 200 kilometers above the surface.
See more ScienceShots.