looking into space

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  • Created by: hanz
  • Created on: 15-05-12 18:28


problems with telescopes:

  • if you're trying to detect light, earth's atmosphere gets in the way - it absorbs a lot of the light coming fro space before it can reach us. the observe the frequencies absorbed, you have to go above the atmosphere
  • then there's pollution light pollution (street lights etc.) makes is hard to pick out dim objects. And air pollution (e.g. dust particles) can reflect and absorb light coming from space. So to get the best view possible from earth, a telescope should be on top of a mountain and far away from any cities
  • but to avoid the problem of the atmosphere, the thing to do is put your telescope in space, away from the mist and murk down here. The first space telescope (Hubble) was launched by NASA in 1990. it can see objects that are about  billion times fainter than you can see unaided from earth


the earliest telescopes were all optical telescopes which detect visible light. They're used to look at objects close by and in other galaxies. but many objects in the universe aren't detectable using visible light - so other types of em wves are needed to observe…


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