“supernovae”可以造什么句，supernovae造句

Pulsars are the dense cores left over after stars of a certain mass explode into supernovae.

However, Bení tez and his colleague,Dr Jesús Maíz-Apellániz, of the Space Telescope Science Institute in Baltimore, now believe that at least two supernovae occurred near Earth two million years ago.

Ever since astronomers discovered that supernova more than 50 years ago, they have been searching for more "missing" supernovae and their remnants.

The infrared brightness of the galaxies allowed the team to estimate how many supernovae should occur.