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Updated September 4th, 2020 at 16:17 IST

NASA's Chandra reveals cosmic delights using 'multiwavelength' approach; see pictures

US space agency NASA has released spectacular images of cosmic objects far far away from Earth but captured using advanced technologies by Chandra Observatory

NASA
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US space agency NASA has released spectacular images of cosmic objects far far away from Earth but captured using advanced technologies by Chandra X-ray Observatory as well as other telescopes.

Telescopes around the globe and a fleet of observatories in space lend humans an 'eye' that can detect all different types of light. From radio waves to gamma rays, this "multiwavelength" approach to astronomy is crucial to getting a complete understanding of objects in space.

NASA's compilation gives examples of images from different missions and telescopes being combined to better understand the science of the universe. Each of these images contains data from Chandra and other telescopes of various types of objects such as galaxies, supernova remnants, stars, planetary nebulas; but together they demonstrate the possibilities when data from across the electromagnetic spectrum are assembled.

Each composite image contains X-ray data from Chandra as well as other telescopes. The objects represent a range of different astrophysical objects and include the galaxy Messier 82, the galaxy cluster Abell 2744, the supernova remnant 1987A, the binary star system Eta Carinae, the Cartwheel galaxy, and the planetary nebula Helix Nebula.

M82

Messier 82, or M82, is a galaxy that is oriented edge-on to Earth. This gives astronomers and their telescopes an interesting view of what happens as this galaxy undergoes bursts of star formation. X-rays from Chandra (appearing as blue and pink) show gas in outflows about 20,000 light-years long that has been heated to temperatures above ten million degrees by repeated supernova explosions. Optical light data from NASA's Hubble Space Telescope (red and orange) shows the galaxy.

Abell 2744

Galaxy clusters are the largest objects in the universe held together by gravity. They contain enormous amounts of superheated gas, with temperatures of tens of millions of degrees, which glows brightly in X-rays, and can be observed across millions of light-years between the galaxies. This image of the Abell 2744 galaxy cluster combines X-rays from Chandra (diffuse blue emission) with optical light data from Hubble (red, green, and blue).

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Supernova 1987A (SN 1987A)

On February 24, 1987, observers in the southern hemisphere saw a new object in a nearby galaxy called the Large Magellanic Cloud. This was one of the brightest supernova explosions in centuries and soon became known as Supernova 1987A (SN 87A). The Chandra data (blue) show the location of the supernova's shock wave — similar to the sonic boom from a supersonic plane — interacting with the surrounding material about four light-years from the original explosion point. Optical data from Hubble (orange and red) also show evidence for this interaction in the ring.

Eta Carinae

What will be the next star in our Milky Way galaxy to explode as a supernova? Astronomers aren't certain, but one candidate is in Eta Carinae, a volatile system containing two massive stars that closely orbit each other. This image has three types of light: optical data from Hubble (appearing as white), ultraviolet (cyan) from Hubble, and X-rays from Chandra (appearing as purple emission). The previous eruptions of this star have resulted in a ring of hot, X-ray emitting gas about 2.3 light-years in diameter surrounding these two stars.

Cartwheel Galaxy

This galaxy resembles a bull's eye, which is appropriate because its appearance is partly due to a smaller galaxy that passed through the middle of this object. The violent collision produced shock waves that swept through the galaxy and triggered large amounts of star formation. X-rays from Chandra (purple) show disturbed hot gas initially hosted by the Cartwheel galaxy being dragged over more than 150,000 light-years by the collision. Optical data from Hubble (red, green, and blue) show where this collision may have triggered the star formation.

Helix Nebula

When a star like the Sun runs out of fuel, it expands and its outer layers puff off, and then the core of the star shrinks. This phase is known as a "planetary nebula," and astronomers expect our Sun will experience this in about 5 billion years. This Helix Nebula image contains infrared data from NASA's Spitzer Space Telescope (green and red), optical light from Hubble (orange and blue), ultraviolet from NASA's Galaxy Evolution Explorer (cyan), and Chandra's X-rays (appearing as white) showing the white dwarf star that formed in the center of the nebula. The image is about four light-years across.

(IMAGES CREDIT: NASA)

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Published September 4th, 2020 at 16:17 IST

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