A follow up to yesterday's Curiosity/Mars blog.
Planetary scientists have been able to monitor the surface of Mars over the years and have found a number of new impacts each year.
Mars Reconnaissance Orbiter has imaged at least 248 new crater impacts which has allowed scientists to estimate that Mars is hit on average 200 times a year with bits of comets and/or asteroids which create a new crater at least 13 feet across.
Read More About It: http://www.jpl.nasa.gov/news/news.php?release=2013-162
Sky Guy in VA