File:Astronomers use Hubble to measure the expansion rate of the Universe (opo9621c).jpg

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An open Universe expands forever because it does not contain enough mass, and so does not have enough gravity to slow down the expansion of space.A closed universe contains enough mass to halt the expansion, and eventually collapses.

Summary

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Description
English: An open Universe expands forever because it does not contain enough mass, and so does not have enough gravity to slow down the expansion of space.A closed universe contains enough mass to halt the expansion, and eventually collapses.A universe with a 'critical density' of matter in space is exactly balanced between these two alternatives, and expands at an ever-slowing rate.
Date 9 May 1996 (upload date)
Source Astronomers use Hubble to measure the expansion rate of the Universe
Author Unknown authorUnknown author

Licensing

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Public domain 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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current20:20, 21 June 2024Thumbnail for version as of 20:20, 21 June 2024500 × 639 (65 KB)OptimusPrimeBot (talk | contribs)#Spacemedia - Upload of https://esahubble.org/media/archives/images/original/opo9621c.jpg via Commons:Spacemedia
20:20, 21 June 2024Thumbnail for version as of 20:20, 21 June 2024500 × 639 (65 KB)OptimusPrimeBot (talk | contribs)#Spacemedia - Upload of https://cdn.esahubble.org/archives/images/large/opo9621c.jpg via Commons:Spacemedia

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