Scientists Say The Universe Is Growing Or Shrinking? And In What Year Did They Discover This?

General
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Scientists Say The Universe Is Growing Or Shrinking? And In What Year Did They Discover This?

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Scientists Say The Universe Is Growing Or Shrinking? And In What Year Did They Discover This?

Answer:

The universe is expanding. This discovery, rooted in the observation of distant galaxies, revolutionized our understanding of cosmology.

Discovery of Expansion:

  1. Edwin Hubble’s Contribution (1929):

    • Edwin Hubble observed that galaxies are moving away from us.
    • He found a relationship between their distance and velocity, showing that galaxies further away move faster.
    • This led to the formulation of Hubble’s Law, supporting the idea that the universe is expanding.
    v = H_0 \cdot d

    Here, ( v ) is the galaxy’s velocity, ( d ) is the distance, and ( H_0 ) is Hubble’s constant.

  2. Cosmic Microwave Background Radiation (1965):

    • Arno Penzias and Robert Wilson discovered cosmic microwave background radiation.
    • This discovery provided evidence of the Big Bang, supporting theories of an expanding universe.

  3. Accelerating Expansion (1998):

    • Observations of distant supernovae showed that the universe’s expansion rate is accelerating.
    • This led to the hypothesis of dark energy, a mysterious force driving the acceleration.

Current cosmological models, like the Big Bang theory, describe an expanding universe with increasing speed due to dark energy. This expansion continues to be a fundamental aspect of our understanding of the cosmos.