The Universe – Revision Questions

  1. What is the main difference between a reflecting telescope and a refracting telescope?
     
  1. What are the advantages of putting a large telescope on top of a mountain?
     
  1. Why do radio telescopes have to be very big?
     
  1. Why do X-ray telescopes have to be in space?
     
  1. If a car is moving away from you quickly what happens to the wavelength of the sound that you hear?
     
  1. What is this effect called?
     
  1. Which has a bigger wavelength, red light or blue light?
     
  1. The light from far away galaxies is “red shifted”.

a)      What has happened to the wavelength of the light from these galaxies?

b)      What does this tell us that the galaxies are doing?

  1. What did Edwin Hubble discover about how fast galaxies are moving?
     
  1. What does this tell us that the Universe is doing?
     
  1. How do many scientists think that the Universe began?
     
  1. What other evidence is there for this?