okt 132012
A Dynamo on Asteroid Vesta

  A meteorite found in Antarctica holds evidence of a once-active dynamo on Vesta. About 4.6 billion years ago, the Solar System was little more than a tenuous disk of gas and dust. In the span of merely 10 million years, this soup evolved to form today’s massive, complex planets. In the intervening period, however, [continue reading]