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At least how many galaxies are there in the observable universe as estimated from Hubble XDF data?
1. <100000
2. Between 100000 and 1 million
3. Between 1 million and 100 billion
4. Between 100 billion and 1 trillion

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Correct Answer - Option 4 : Between 100 billion and 1 trillion

The correct answer is Between 100 billion and 1 trillion.

  • The Astrophysical Journal Christopher Conselice using 3D modeling of images collected over 20 years by the Hubble Space Telescope concluded that there are more than two trillion (2×1012) galaxies in the observable universe.
  • Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity.
  • In 1936, Hubble debuted a way to classify galaxies, grouping them into four main types:
    • Spiral Galaxies
    • Lenticular Galaxies
    • Elliptical Galaxies
    • Irregular Galaxies
  • More than two-thirds of all observed galaxies are spiral galaxies.
  • We live in one of the arms of a large spiral galaxy called the Milky Way.
  • The Sun and its planets (including Earth) lie in this quiet part of the galaxy, about halfway out from the center.

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