How big is a supernova?
When supernovae explode, they jettison matter into space at some 9,000 to 25,000 miles (15,000 to 40,000 kilometers) per second. These blasts produce much of the material in the universe—including some elements, like iron, which make up our planet and even ourselves.
Join Alexa Answers
Help make Alexa smarter and share your knowledge with the worldLEARN MORE