We see galaxies and stars as they were in the past

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  • Created by: Naana
  • Created on: 07-04-14 13:55

We see galaxies and stars as they were in the past

·         Electromagnetic radiation (e.g. light) travels in a vacuum at about 300 000km per second

·         The radiation from the sun that reaches us leaves about 8 minutes before we see it, as the sun is about  150 million km away from Earth

·         That means that when we look at the sun we see it as it was about 8 minutes ago

·         Since the nearest star to us after the sun is about 4.2 light years away, light from it takes 4.2 years to reach us. This means that we see it as it was 4.2 years ago

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