Resumen de What Heated the Asteroids?
This article raises the question of what causes asteroids to heat up. Asteroids have moderately high abundances of volatile substances (including noble gases and water) and contain numerous tiny presolar grains (dust particles that formed long ago in the outer atmospheres of other stars and remained unchanged through the history of our solar system). INSETS: ASTEROIDS: PRIMORDIAL RELICS;METEORITES: BITS OF HEAVEN ON EARTH;CRATERS COMPARED.
