Asteroid Gaspra's Best Face . ... Credit Copyright: NASA , The Galileo Project , USGS , Cornell U. , JPL Explanation: Above is the best yet color image of the asteroid Gaspra based on data returned by NASA's Galileo spacecraft. ... When it arrives at Jupiter , in December 1995, the robot spacecraft's atmospheric probe will descend into Jupiter's atmosphere , becoming the first ever probe to enter the atmosphere of a gas giant planet. ... U. Based on Astronomy Picture Of the Day ...