Contents

13 October 2000
Vol 290, Issue 5490

About The Cover

Cover image expansion

COVER A photograph of the wind-sheared dust cloud left by a brilliant fireball over the Yukon Territory, Canada, in the early morning of 18 January 2000. The fireball was produced by the atmospheric entry of a 5-m-diameter asteroid. Surviving fragments fell across an area at least 16 km long by 5 km wide on the ice of Tagish Lake in British Columbia. Initial work on the Tagish Lake meteorite suggests that it may represent the most primitive solar system material yet studied. See page 320. [Photo: M. MacDonald]