Gerry Gilmore, professor of experimental philosophy at Cambridge University's Institute of Astronomy told the Sunday Times: "Gaia will measure all the asteroids including those between us and the sun which are the really nasty ones because we can't see them."
During its five-year-mission the £800 million Gaia will also map the stars with unprecedented precision - giving astronomers the first accurate 3D map of our galaxy and measure distance between the stars. A spokseman for the ESA said: "During its anticipated lifetime of five years, Gaia will observe each of its 1billion sources about 70 times, resulting in a record of the brightness and position of each source over time.
The satellite completed final preparations in Europe last year and will take off from a launch site in French Guiana on November 20.
http://www.sott.net/article/267825-Asteroid-fear-Gaia-satellite-sent-into-space-to-monitor-blind-zone-between-sun-and-Earth