By — Jenny Marder Jenny Marder Leave your feedback Share Copy URL https://www.pbs.org/newshour/science/what-is-a-supernova Email Facebook Twitter LinkedIn Pinterest Tumblr Share on Facebook Share on Twitter Harvard Astrophysicist Answers: What Is a Supernova? Science Nov 15, 2010 3:38 PM EDT Robert Kirshner, an astrophysicist from the Harvard-Smithsonian Center for Astrophysics, answers the question, “What is a supernova?” A supernova explosion is something where you see a star that you hadn’t seen before suddenly turn billions of times brighter than it was,” Kirshner said. “So it’s an exploding star, and we think we know that the energy for these stars comes from either nuclear energy — that is thermonuclear fusion like a bomb going off for some supernova — or from gravity, from the collapse of a star down to form a little nugget of a neutron star, or even a black hole. Supernova 1987A, we think, is of this second kind. It’s the kind that’s powered by gravity, where the center of a star runs out of fuel, collapses in a fraction of a second and then bounces and blasts its material out into the gas between the stars. So a supernova explosion is an exploding star. It’s something that is the end of a star, and it’s a tremendously energetic explosion. Email your Just Ask! questions to science@newshour.org with “Science Question” in the subject line. We're not going anywhere. Stand up for truly independent, trusted news that you can count on! Donate now By — Jenny Marder Jenny Marder Jenny Marder is a senior science writer for NASA and a freelance journalist. Her stories have appeared in the New York Times, the Washington Post and National Geographic. She was formerly digital managing editor for the PBS NewsHour. @jennymarder
Robert Kirshner, an astrophysicist from the Harvard-Smithsonian Center for Astrophysics, answers the question, “What is a supernova?” A supernova explosion is something where you see a star that you hadn’t seen before suddenly turn billions of times brighter than it was,” Kirshner said. “So it’s an exploding star, and we think we know that the energy for these stars comes from either nuclear energy — that is thermonuclear fusion like a bomb going off for some supernova — or from gravity, from the collapse of a star down to form a little nugget of a neutron star, or even a black hole. Supernova 1987A, we think, is of this second kind. It’s the kind that’s powered by gravity, where the center of a star runs out of fuel, collapses in a fraction of a second and then bounces and blasts its material out into the gas between the stars. So a supernova explosion is an exploding star. It’s something that is the end of a star, and it’s a tremendously energetic explosion. Email your Just Ask! questions to science@newshour.org with “Science Question” in the subject line. We're not going anywhere. Stand up for truly independent, trusted news that you can count on! Donate now