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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)


47 Tucanae: The Mysterious Afterlife of Stellar Giants

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Narrator (April Hobart, CXC): Neutron stars are the ultra-dense cores left behind after a massive star reaches the end of its life and explodes. The star's outer layers are blasted away in the explosion, but material at the centre of the star collapses in on itself. This forming a tightly packed ball of material and what we end up with is the densest (meaning 'most tightly packed') object known in the entire Universe outside of a black hole: a neutron star!

This new space picture shows a group of stars called a globular cluster. These are some of the oldest objects in space - almost as old as the Universe itself! This means many of the stars within have already lived their lives. The most massive have long since exploded, leaving behind several neutron stars.

Using a neutron star within this cluster, along with several others, astronomers have worked out the relationship between the stars' mass (how much material they have) and how big they are.

The new data shows that an average neutron star, with the same mass as around one and a half of our Sun's, would be around 12 km across. That's about the size of a town! With all this material packed down into such a small space, neutron stars are unbelievably dense objects. The pressure at their centers is over ten trillion trillion times the pressure required to form diamonds inside the Earth.

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