File:Hubble and Gaia Measure Cepheid Variable Stars (2018-34-4210).tif
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[edit]DescriptionHubble and Gaia Measure Cepheid Variable Stars (2018-34-4210).tif |
English: Using two of the world’s most powerful space telescopes — NASA’s Hubble and ESA’s Gaia — astronomers have made the most precise measurements to date of the universe’s expansion rate. This is calculated by gauging the distances between nearby galaxies using special types of stars called Cepheid variables as cosmic yardsticks. By comparing their intrinsic brightness as measured by Hubble, with their apparent brightness as seen from Earth, scientists can calculate their distances. Gaia further refines this yardstick by geometrically measuring the distances to Cepheid variables within our Milky Way galaxy. This allowed astronomers to more precisely calibrate the distances to Cepheids that are seen in outside galaxies. |
Date | 12 July 2018 (upload date) |
Source | Hubble and Gaia Measure Cepheid Variable Stars |
Author | , , and A. Feild () |
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[edit]Public domainPublic domainfalsefalse |
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 | 21:55, 7 September 2023 | 1,725 × 1,800 (8.92 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://stsci-opo.org/STScI-01EVSZYD2CZJXZ08JNJTND28G8.tif via Commons:Spacemedia |
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Image title | Using the powerful Hubble and Gaia space telescopes, astronomers just took a big step toward finding the answer to the Hubble constant, one of the most important and long-sought numbers in all of cosmology. This number measures the rate at which the universe is expanding since the big bang, 13.8 billion years ago. The constant is named for astronomer Edwin Hubble, who nearly a century ago discovered that the universe was uniformly expanding in all directions. Now, researchers have calculated this number with unprecedented accuracy. Intriguingly, the new results further intensify the discrepancy between measurements for the expansion rate of the nearby universe, and those of the distant, primeval universe - before stars and galaxies even existed. Because the universe is expanding uniformly, these measurements should be the same. The so-called tension implies that there could be new physics underlying the foundations of the universe. |
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Author | Space Telescope Science Institute Office of Public Outreach |
Width | 1,725 px |
Height | 1,800 px |
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Compression scheme | Uncompressed |
Pixel composition | RGB |
Image data location | 36,226 |
Orientation | Normal |
Number of components | 3 |
Number of rows per strip | 1,800 |
Bytes per compressed strip | 9,315,000 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CC 2017 (Macintosh) |
File change date and time | 14:25, 9 July 2018 |
Exif version | 2.21 |
Color space | Uncalibrated |