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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)


4C+29.30: The Invisible Universe Exposed

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Narrator (April Hobart, CXC): Pictures of space are often gorgeous. But one of the most exciting things about them is that, very often, they show us things that are invisible to the human eye. This picture in particular does that. In the middle of the photograph lurks an invisible monster, called a super-massive black hole To make this invisible object even harder to study, it is hidden under a thick cloud of dust at the centre of its home galaxy! Even the bright blobs of colour you can see are patches of light that our eyes cannot detect naturally. The pink colour shows radio light, and X-rays are shown in blue.

A black hole is anything but empty space, don't let the name fool you. It is a huge amount of material packed into a very tiny area - this one has about 100 million times the mass of our Sun! Anything that wanders too close to a Black Hole is pulled into it with no chance of escape, including light. This is why we cannot see black holes, they are invisible even to telescopes that detect X-rays, radio waves and other types of light.

The only way we can spot black holes is by detecting its effect on other things. For example, in this picture, the brightest blue patches, along the edge of the galaxy reveal where a high-energy jet has ploughed into clumps of galactic dust. The jet was made up of particles that were heated as they were pulled into the black hole. This gave them energy and sent them speeding away from the black hole at millions of miles per hour! Two similar jets can be seen in pink, shooting to the North and South of the galaxy.

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