File:Globular Clusters around Milky Way (2019-16-4369).pdf
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Captions
This illustration shows the fundamental architecture of our island city of stars, the Milky Way galaxy: a spiral disk, central bulge, and diffuse halo of stars and globular star clusters.
Summary[edit]
| Description |
English: This illustration shows the fundamental architecture of our island city of stars, the Milky Way galaxy: a spiral disk, central bulge, and diffuse halo of stars and globular star clusters. Not shown is the vast halo of dark matter surrounding our galaxy. A comprehensive survey that combines the observing prowess of both the Hubble Space Telescope and the European Space Agency's Gaia satellite measured the total mass of our galaxy at 1.5 trillion solar masses. Only a few percent of the estimated 200 billion stars in our galaxy contributes to this total. Most of the rest is locked up in invisible dark matter. The precision of Hubble and Gaia each allowed astronomers to measure the movement of the isolated spherical islands called globular star clusters. The more massive a galaxy, the faster its clusters move under the pull of gravity. And, this allows for the mass of our galaxy to be calculated. |
| Date | 7 March 2019 (upload date) |
| Source | Globular Clusters around Milky Way |
| Author | NASA, ESA, and A. Feild (STScI) |
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Licensing[edit]
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This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use. The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org. For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag. |
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| current | 09:25, 27 August 2023 |  | 1,500 × 1,200 (24 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://stsci-opo.org/STScI-01EVSWQJAYQQNCD721HQPXT2H1.pdf via Commons:Spacemedia |
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