Please Answer the Following questions.
1. Explain how the size of the Earth was first measured. [3 marks]
2. Explain how astronomers can measure the distance to nearby stars using parallax.
[3 marks]
3. Explain how parallax measurements would change (relative to those performed on Earth) if
they made by an astronomer on Mars. [2 marks]
4. Explain why the most distant galaxies we can see are 40 billion light years away, even
though the Universe is only 13.8 billion years old. [2 marks]
