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Recent Podcast
A Tour of Eta Carinae
A Tour of Eta Carinae
New Chandra data are helping astronomers better understand how the two stars in Eta Carinae interact with one another through powerful winds blowing off their surfaces. (2014-08-27)


Kepler's Supernova Remnant in 60 Seconds

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Narrator (April Hobart, CXC): Over 400 years ago, Johannes Kepler and many others witnessed the appearance of a new "star" in the sky. Today, this object is known as the Kepler supernova remnant. For some time, astronomers have thought that the Kepler remnant comes from a so-called Type Ia supernova. These supernovas are the result of a thermonuclear explosion of a white dwarf. However, there is an ongoing controversy about Type Ia supernovas. Are they caused by a white dwarf pulling so much material from a companion star that it becomes unstable and explodes? Or do they result from the merger of two white dwarfs? New Chandra images reveal a disk-shaped structure near the center of the remnant. Researchers interpret this X-ray emission to be caused by the collision between supernova debris and disk-shaped material that a giant star expelled before the explosion. This and other pieces of evidence suggest that at least the Type Ia explosion that created Kepler was not the result of a merger between white dwarfs. Since these supernovas are used to measure the expansion of the Universe itself, astronomers are eager to understand them inside and out.

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