The circular shape of the Earth's shadow on the Moon during a ...

[lunatika]

The circular shape of the Earth's shadow on the Moon during a lunar eclipse suggested to the Greeks that the Earth was
 
  A) cylindrical in shape
  B) at the center of the Universe
  C) flat
  D) spherical in shape

Question 2

Process of Science: Explain how we can use telescopes as time machines to directly test theories of galaxy formation.
 
  What will be an ideal response?

[nikmaaacs]

Answer to Question 1

D

Answer to Question 2

Telescopes see objects as they were when the light left them. For distant objects, this lookback time can be billions of years and we can literally see galaxies in the process of formation. In this way, we can directly test theories for how they form.

[lunatika]

Gracias!

[pangili4]

Thanks for the timely response, appreciate it