News Earth Protective Blanket: Atmosphere blocks many small stony asteroids Share this:FacebookTwitterPocketRedditPrintEmail By Sid Perkins July 16, 2003 at 11:00 am This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe