An anonymous reader writes: Mercury may once have orbited the Sun in a synchronous rotation, according to new calculations that suggest a collision with a large asteroid may have knocked Mercury into its unusual orbit.
Attend or create a Slashdot 20th anniversary party! DEAL: For $25 - Add A Second Phone Number To Your Smartphone for life! Use promo code SLASHDOT25. Check out the new SourceForge HTML5 Internet speed test. ×