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Back Astronomers use Hubble to measure the Expansion Rate of the Universe

Astronomers use Hubble to measure the Expansion Rate of the Universe


Depicts: Theories on Universe expansion rate
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(Illustration) 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.

Last Update: 1 September 2019
10-Mar-2026 06:27 UT

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