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Star field in the halo of the Andromede galaxy - Deep field image in the...
IMAGE
number
PIX4572242
Image title
Star field in the halo of the Andromede galaxy - Deep field image in the halo of Andromeda galaxy - Deep field in the halo of the Andromede galaxy obtained by the Hubble space telescope in 2003. 300,000 stars as well as thousands of background galaxies are visible. Astronomers using Nasa's Hubble Space Telescope (HST) have reliably measured the age of the spherical halo of stars surrounding the neighboring Andromeda galaxy (M31). To their surprise, they have discovered that approximately one - third of the stars in Andromeda's halo formed only 6 to 8 billion years ago. That's a far cry from the 11 - to - 13 billion - year age of the stars in the Milky Way's halo. Why the difference in halo ages? Apparently, M31 must have gone through a major “” corporate merger”” with another large galaxy, or a series of mergers with smaller galaxies, billions of years ago. Astronomers cannot yet tell whether this was one tumultuous event or a more continual acquisition of smaller galaxies. The newly discovered younger stars in Andromeda's halo are richer in heavier elements than the stars in our Milky Way's halo, or in most of the small dwarf galaxies that surround the Milky Way. Indeed the level of chemical enrichment seen in these younger stars is characteristic of relatively massive galaxies, containing at least a billion stars. This suggests three possibilities: (1) Collisions destroyed the young disk of M31 and dispersed many of its stars into the halo; (2) a single collision destroyed a relatively massive invading galaxy and dispersed its stars and some of Andromeda's disk stars into the halo; and/or (3) many stars formed during the collision itself. Astronomers say it will take more detailed observations to unravel the acquisition history of these early cataclysmic events. Located only 2.5 million light - years away, the magnificent Andromeda galaxy, visible as a naked - eye spindle of light in the autumn sky has long been considered a near twin to our
Star field in the halo of the Andromede galaxy - Deep field image in the halo of Andromeda galaxy - Deep field in the halo of the Andromede galaxy obtained by the Hubble space telescope in 2003. 300,000 stars as well as thousands of background galaxies are visible. Astronomers using Nasa's Hubble Space Telescope (HST) have reliably measured the age of the spherical halo of stars surrounding the neighboring Andromeda galaxy (M31). To their surprise, they have discovered that approximately one - third of the stars in Andromeda's halo formed only 6 to 8 billion years ago. That's a far cry from the 11 - to - 13 billion - year age of the stars in the Milky Way's halo. Why the difference in halo ages? Apparently, M31 must have gone through a major “” corporate merger”” with another large galaxy, or a series of mergers with smaller galaxies, billions of years ago. Astronomers cannot yet tell whether this was one tumultuous event or a more continual acquisition of smaller galaxies. The newly discovered younger stars in Andromeda's halo are richer in heavier elements than the stars in our Milky Way's halo, or in most of the small dwarf galaxies that surround the Milky Way. Indeed the level of chemical enrichment seen in these younger stars is characteristic of relatively massive galaxies, containing at least a billion stars. This suggests three possibilities: (1) Collisions destroyed the young disk of M31 and dispersed many of its stars into the halo; (2) a single collision destroyed a relatively massive invading galaxy and dispersed its stars and some of Andromeda's disk stars into the halo; and/or (3) many stars formed during the collision itself. Astronomers say it will take more detailed observations to unravel the acquisition history of these early cataclysmic events. Located only 2.5 million light - years away, the magnificent Andromeda galaxy, visible as a naked - eye spindle of light in the autumn sky has long been considered a near twin to our
Personal Prints, Cards, Gifts, Reference. Not for commercial use, not for public display, not for resale.
Eg: Put this image on a mug or as a single print for oneself or a present for someone.
$25.00
Personal website or social media
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$50.00
Corporate website, social media or presentation/talk
Use on a company website, in a company social media post/page/blog, in an app or in a corporate presentation (internal or external). Not for advertising or collateral. All languages, 3 years.
$190.00
Editorial (Books, magazines and newspaper) - standard
Print and/or digital. Single use, any size, inside only. Single language only. Single territory rights for trade books; worldwide rights for academic books. Print run up to 1500. 7 years. (excludes advertising)
eg:Illustrate the inside of a book or magazine with a print run of 1,000 units
$100.00
Editorial (Books, magazines and newspaper) - extended
Print and/or digital. Single use, any size, inside only. Single language only. Single territory rights for trade books; worldwide rights for academic books. Print run up to 5000. 7 years. (excludes advertising)
eg: Illustrate the inside of a book or magazine with a print run of 5,000 units
