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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)


SGR 0418+5729: A Flare for the Dramatic

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Narrator (April Hobart, CXC): Never let it be said that stars don't have style: when a massive star comes to the end of its life it doesn't quietly burn out like a dying candle. Instead, it goes out with a bang, or rather an explosion that outshines almost everything else in the Universe! This explosion is called a supernova, and when this happens, the star is torn apart, throwing material into space. But something is left behind - a 'neutron star' - the remaining core of a massive star once it has exploded.

This picture might look like a jawbreaker that's been dipped in dental floss, but it actually shows an artist's impression of a very exotic type of neutron star called a "magnetar".

Magnetars are some of the most extreme objects known in the Universe. They are a very small and ultra-compact type of neutron star that erupt randomly with bursts of powerful high-energy flares. These stars were given their name because they are very strong magnets. You've probably played with magnets in school. Each magnets is surrounded by an invisible force field, called a "magnetic field".

Magnetars have notoriously strong magnetic fields - the strongest in the entire Universe, in fact! Well, except for this one. This picture shows "SGR 0418", a magnetar that doesn't fit the mould. It has a much weaker magnetic field on its surface than any other star of its kind. What makes this really puzzling is that it raises the question: where does the energy come from to power its dramatic high-energy flares? It is thought to come from the strong magnetic field. But this theory doesn't work for SGR 0418! SGR 0418 appears to be an oddity amongst oddities! Astronomers are puzzled but think that there is a much stronger magnetic field underneath the surface of SGR 0418.

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