Asteroid Vesta Has Unique ‘Space Weathering’
Space weathering — a darkening of lunar surfaces by solar wind and metal nanoparticles from vaporized meteorites — appears to happen differently on Vesta, the largest body in the asteroid belt. The discovery, from NASA’s Dawn spacecraft, has planetary geologists returning to their lunar data for another look and further analysis.
PROVIDENCE, R.I. [Brown University] — The surface of the giant asteroid Vesta is weathering in a way that appears to be completely different from any other asteroid yet visited, according to new data recorded by NASA’s Dawn spacecraft. This new type of space weathering suggests that there’s something about Vesta — perhaps its mineral composition or its position in the solar system — that makes its surface environment fundamentally different from other asteroids studied thus far.
The new data are presented in a paper published Nov. 1, 2012, in the journal Nature. (more…)