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Recent Podcast
A Tour of The Big, Bad & Beautiful Universe with Chandra
A Tour of The Big, Bad & Beautiful Universe with Chandra
To celebrate the 15th anniversary of NASA's Chandra X-ray Observatory, we have released four new images of supernova remnants. These show Chandra's ability to study the remains of supernova explosions, using images that are the sharpest available in X-ray astronomy. The images of the Tycho and G292.0+1.8 supernova remnants show how Chandra can trace the expanding debris of an exploded star. The images show shock waves, similar to sonic booms from a supersonic plane, that travel through space at speeds of millions of miles per hour. The images of the Crab Nebula and 3C58 show the effects of very dense, rapidly spinning neutron stars created when a massive star explodes. These neutron stars can create clouds of high-energy particles that glow brightly in X-rays. The image for G292 shows oxygen (yellow and orange), and other elements such as magnesium (green) and silicon and sulfur (blue) that were forged in the star before it exploded. For the other images, the lower energy X-rays are shown in red and green and the highest energy X-rays are shown in blue. (2014-07-22)


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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