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Home Science & Tech

Goldilocks Zone

April 24, 2020
in Science & Tech
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Context:  NASA planet hunter finds Earth-sized world in ‘Goldilocks zone’

  • The Goldilocks Zone refers to the habitable zone around a star where the temperature is just right – not too hot and not too cold – for liquid water to exist on an planet
  • The location of a Goldilocks Zone around another star depends on the type of star,
  • Bigger hotter stars have their Goldilocks Zones further out, while smaller cooler stars such as M-type red dwarf stars have habitable zones much closer in.
  • Just because a planet or moon is in the Goldilocks Zone of a star, doesn’t mean it’s going to have life or even liquid water. Earth isn’t the only planet in the Sun’s Goldilocks Zone – Venus and Mars are also in this habitable zone, but aren’t currently habitable.
  • NASA’s planet-hunter satellite TESS had discovered an Earth-sized world within the habitable range of its star, which could allow the presence of liquid water.
  • A few other similar planets have been discovered before, notably by the former Kepler Space Telescope, but this is the first discovered by TESS, which was launched in 2018
  • The planet, named “TOI 700 d”, is relatively close to Earth — only 100 light-years away, 
  • TESS was designed and launched specifically to find Earth-sized planets orbiting nearby stars

 

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