In approximately 5 billion years, the sun will deplete its hydrogen fuel and collapse under its own gravity, becoming a white ...
Three billion years ago, a sun -like star reached the end of its life, throwing off its outer layers following its red giant ...
"'Oumuamua is in a different category of object. It's much harder to find, but there are a lot more of them." The first interstellar object to visit the solar system may have been a fragment of an icy ...