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Parallax angle less than 0.01 arcsec are very difficult to measure from Earth due to the-
1. varying light intensity from Sun
2. larger distances between Earth and other celestial bodies
3. inaccuracy of measurement in vacuum of outer space
4. effects of the Earth's atmosphere

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Correct Answer - Option 4 : effects of the Earth's atmosphere

The correct answer is option 4) i.e. effects of the Earth's atmosphere

CONCEPT:

  • Parallax method: This method is used to determine large distances such as the distance of a planet or a star from the earth.
    • Parallax is the approximate shift in the position of an object with respect to another when we shift the point observation sideways.

EXPLANATION:

  • The parallax method is affected by the path of light that travels from the distant planet to the points of observation on Earth.
  • The light from a distant object reaching the observer goes through multiple layers of the atmosphere of Earth.
  • These layers of atmosphere subject the light to undergo multiple refractions and decreases the accuracy of the method.
  • Hence, extremely small parallax angles less than 0.01 arcsec are very difficult to measure due to the effects of the Earth's atmosphere.

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