Author Question: Why are telescopes sometimes called time machines? A) because the author, H.G. Wells, used the ... (Read 43 times)

Starlight · **on:** Jul 27, 2018

Why are telescopes sometimes called time machines?

A) because the author, H.G. Wells, used the term to describe telescopes in a book
B) because some of the oldest telescopes are still in use today
C) because observations of distant objects reveal them as they were in the past
D) because astronomers can use telescopes to see the Milky Way as it was when it was much younger
E) It's a journalistic misnomer: you cannot travel into the past or the future.

Question 2

Why is Europa considered a good candidate for the possible existence of life?

A) Strong evidence suggests that it has a deep, subsurface ocean of liquid water.
B) The Galileo spacecraft found strange seasonal changes on its surface that look like they could be due to life.
C) It is located within our Sun's habitable zone.
D) It has a thick atmosphere with a surface pressure greater than that on Earth.