File:MACHO-96-BLG-5.jpg
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English: [Left] Two images of a crowded starfield as seen through a ground-based telescope show the subtle brightening of a star due to the effect of gravitational microlensing, where an invisible but massive foreground object passes in front of the star and amplifies its light. The dark lensing object is estimated to be a six-solar-mass black hole that is drifting alone among the stars. [Right] A NASA Hubble Space Telescope image of the same field clearly resolves the lensed star and yields its true brightness. The Hubble observation was needed because the ground-based images do not tell how bright the lensed star actually was before (or after) it was lensed. The star fields where microlensing events are observed are so crowded with stars that the lensed star images are often blended together with images of unlensed stars. But with the Hubble images, astronomers can identify the lensed star and determine its normal brightness. The Hubble images were taken on June 15, 1999. |
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| Source | https://hubblesite.org/contents/news-releases/2000/news-2000-03.html |
| Author |
[LEFT] – NOAO (https://noirlab.edu), Cerro Tololo Inter-American Observatory; [Right] – NASA and Dave Bennett |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) |  |
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This media was created by the National Optical-Infrared Astronomy Research Laboratory (NOIRLab).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public NOIRLab website, along with the texts of press releases, announcements, images of the week and captions; are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible." To the uploader: You must provide a link (URL) to the original file and the authorship information if available. |
  This file is licensed under the Creative Commons Attribution 4.0 International license.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 11:11, 3 July 2023 | | 3,001 × 2,401 (499 KB) | Юрий Д.К. (talk | contribs) | original |
| 11:26, 6 August 2010 |  | 1,536 × 1,229 (337 KB) | Henrykus (talk | contribs) | {{Information |Description={{en|1=[Left] Two images of a crowded starfield as seen through a ground-based telescope show the subtle brightening of a star due to the effect of gravitational microlensing, where an invisible but massive foreground object pas |
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