• Since the early 1990s, astronomers have discovered other solar systems.
  • As of April 2014, more than 4,600 exoplanets have been found, with 1706 confirmed.
  • Most are discovered because of some tell-tale signs, such as the slight motion of a star.
  • If there is life elsewhere in the Universe, it is most likely on an Earth-like exoplanet.
  • According to NASA, a statistical analysis shows that the Milky Way galaxy contains 100 million planets.
  • In this video by Science Friday, artist Helena Kauppila explains how she makes drawings of the night sky.
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