How is distance determined to the nearest stars? How far out can ...

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How is distance determined to the nearest stars? How far out can this technique be applied? How many stars can be measured in this way?
 
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Question 2

The concept that on the grandest of scales, the universe is similar in appearance everywhere is:
 
  A) special relativity.
  B) general relativity.
  C) homogeneity.
  D) isotropy.
  E) universality.

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Answer to Question 1

The distance to the nearest stars is measured using parallax. The star is observed when the Earth is on either side of its orbit, six months apart. From the slight motion of the star, resulting from the Earth's change in perspective, and knowing the size of the Earth's orbit, the distance to the star can be calculated. The Hipparcos mission measured about a million stars out to 200 parsecs, or about 700 light years.

Answer to Question 2

C

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TYSM

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Excellent