Research NewsEarth Science

Impact Craters All in a Row?

See allHide authors and affiliations

Science  05 Apr 1996:
Vol. 272, Issue 5258, pp. 33
DOI: 10.1126/science.272.5258.33


Space Shuttle radar has yielded hints that Earth may have been pelted by the bits of a shattered asteroid or comet, an event that made headlines when it happened to Jupiter two summers ago. Many geologists are skeptical of the claim, however. The radar images seem to show a string of three 12-kilometer impact craters in the Sahara of northern Chad, but an impact origin has been confirmed only for the first crater, which was formed roughly 365 million years ago; the others could be volcanic features.