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New borderless print measures 5" x 7" (approximate). Our prints are custom made-to-order using a gloss finish on heavy-weight photographic paper. Print is also coated for water-resistance and acid free to prevent yellowing. **A Note on Image Quality: The quality of historic images are subject to the wearing of time, the capabilities of the original photographer, and limitations of period technology. History affords us no re-takes; we must content ourselves with what has been left to us. Please note that we do not attempt to fix, enhance or disturb the original image in any way, as we feel these eccentricities add to its historic charm. Thank you for taking this into consideration before making your purchase.
- Title - Variable Stars in a Distant Spiral Galaxy
- Description Source - NASA
- Year - May 1, 1999
- SKU - NAS-0013
- Description - NASA Hubble Space Telescope (HST) view of the magnificent spiral galaxy NGC 4603, the most distant galaxy in which a special class of pulsating stars called Cepheid variables have been found. It is associated with the Centaurus cluster, one of the most massive assemblages of galaxies in the nearby universe. The Local Group of galaxies, of which the Milky Way is a member, is moving in the direction of Centaurus at a speed of more than a million miles an hour under the influence of the gravitational pull of the matter in that direction. Clusters of young bright blue stars highlight the galaxy's spiral arms. In contrast, red giant stars in the process of dying are also found. Only the very brightest stars in NGC 4603 can be seen individually, even with the unmatched ability of the Hubble Space Telescope to obtain detailed images of distant objects. Much of the diffuse glow comes from fainter stars that cannot be individually distinguished by Hubble. The reddish filaments are regions where clouds of dust obscure blue light from the stars behind them. This galaxy was observed by a team affiliated with the HST Key Project on the Extragalactic Distance Scale. Because NGC 4603 is much farther away than the other galaxies studied with Hubble by the Key Project team, 108 million light-years, its stars appear very faint from the Earth, and so accurately measuring their brightness, as is required for distinguishing the characteristic variations of Cepheids, is extremely difficult. Determining the distance to the galaxy required an unprecedented statistical analysis based on extensive computer simulations.
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