Facts about Dark Energy Discovery

1. 05

   A cosmological constant, originally introduced and then abandoned by Einstein, was revived as a leading theoretical explanation for dark energy after the 1998 discovery.

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2. 04

   Before dark energy discovery, the prevailing assumption among cosmologists was that gravity would eventually slow and possibly reverse the universe's expansion.

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3. 03

   Observations of Type Ia supernovae served as the critical evidence revealing that a mysterious repulsive force, later termed dark energy, is driving the universe's accelerating expansion.

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4. 02

   Dark energy is estimated to constitute approximately 68 percent of the total energy content of the observable universe.

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5. 01

   The 1998 discovery that the universe's expansion is accelerating, made by two independent supernova research teams, earned Saul Perlmutter, Brian Schmidt, and Adam Riess the 2011 Nobel Prize in Physics.

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