9 febrero 2015
Astronomers have identified two surprisingly massive stars at the heart of the planetary nebula Henize 2-428. As they orbit each other the two stars are expected to slowly get closer and closer, and when they merge, about 700 million years from now, they will contain enough material to ignite a vast supernova explosion.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/TlDQVG5lm2s/150209113040.htm
