The Medusa galaxy is seen in a composite of x-ray data from the Chandra X-ray Observatory and visible light captured by the Hubble Space Telescope in this image released March 10.The x-ray data, rendered in blue, also shows a black hole on the left-hand side of the image.
Since x-rays can be sensed long after the stars that created them expire, x-rays can be used as "fossils" to study the history of a galaxy’s star formation.Astronomers also believe that stars that produce greater quantities of x-rays form more quickly.
Two hearts are about to become one in a rare picture of galaxies colliding.The bright object NGC 6240 is actually a pair of galaxies tangled together in a late phase of their evolution just before they merge. The cores of the two galaxies, still visible as separate points, are hurtling toward each other and will likely combine in just a few million years.The galactic "train wreck" is generating huge amounts of heat, seen above as visible and infrared light in combined images from the Hubble and Spitzer space telescopes.
This cosmic oddball, a chaotic tangle of two galaxies, appears in its sharpest detail yet in this new image from the ESO Very Large Telescope at Chile’s Paranal Observatory.The composite image–created with blue, green, red, and infrared filters–gives astronomers a closer look at the unusual structure, which lies lies about 70 million light-years away in the constellation of Libra.Source
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