Planetary Pretender Asteroid Vesta Has Planet Like Features
NANTES, France—Asteroids are often considered debris, the scraps and odd lumps that went unused in the forming of the planets. But when it comes to Vesta, one of the largest asteroids in our solar system, Chris Russell hardly considers the rock a mere castoff. “I’ve started calling it the smallest terrestrial planet,” said Russell, the principal investigator for NASA’s Dawn mission, which sent a spacecraft into orbit at Vesta in July....