supernovae造句怎么写

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.

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

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

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