We once considered the Sun a planet, and it took finding Uranus to decide that moons should really be their own category of thing. These are all the places in our solar system that were once planets—but now have far more suitable names.
NASA launched Dawn spacecraft in 2007 to study two of the three known protoplanets of the asteroid belt: Vesta and Ceres. And now here is an amazing interactive tool, very similar to Google Earth, called Vesta Trek, which let you explore Vesta—one of the largest asteroids in the Solar System—on your own.
At 330 miles in diameter, Vesta is the second most massive object in the asteroid belt. NASA's Dawn spacecraft has been orbiting it for some time now, but it's finally generated an image which shows the asteroid in all its glory.
At 330 miles in diameter, Vesta is the second most massive object in the asteroid belt. On Friday 15, NASA's Dawn spacecraft entered its orbit firing its ion thruster to reduce its speed. Then it captured this image.
History, made: The unmanned Dawn spacecraft has successfully entered orbit around Vesta, a massive asteroid some 117 million miles from our planet. This is the first spacecraft to orbit and object in our solar system's asteroid belt. [MSNBC]