That's really interesting, Patrick. Either something gave it such a smack on the other side that the shockwave popped out a hill on this side, or it's the bottom of a crater -- that is, the impact made a hardened plug and then the outside of the asteroid eroded away leaving the plug. -- Thanks for posting it, Joe ________________________________ From: Patrick Wiggins <paw@wirelessbeehive.com> To: utah astronomy utah astronomy listserve <utah-astronomy@mailman.xmission.com> Sent: Friday, July 8, 2011 1:28 AM Subject: [Utah-astronomy] Vesta and Tycho pictures Vesta from NASA's Dawn spacecraft. Range 100,00 km. Shows a kind of a tumor-looking growth. Maybe something bulging up from below? Or maybe what's left of something that impacted long ago? http://dawn.jpl.nasa.gov/multimedia/dawn_vesta_image_070111.asp Impressive view of the central peak in Tycho as seen by NASA's LRO spacecraft: http://apod.nasa.gov/apod/ap110706.html patrick _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php