Looking into space

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We can't travel to stars to study them-it'd take thousands of years. All we can do is measure the electromagnetic radiation coming from them.

Radiation can tell us a lot about stars ad galaxies

  • We can tell a lot about a star by studying the electromagnetic (EM) radiation it emits (gives out)
  • You can get an idea of how far away a star is by measuring the light radiation coming from it (its brightness)
  • A star that looks very bright on Earth could be either quite close to Earth but not very bright, OR a long way away and very bright
  • But astronomers know how much radiation certain types of stars actually emit
  • So by seeing how bright they look from Earth, they can tell how far away those stars must be
  • You can also use parallax to measure the distance to nearby stars
  • Parallax is when


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