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There are at least three catalogues that are counting up-to-date discovered exoplanets. What criteria do they use to count the number of planets? Every catalogue has a different count value.

So at this moment various catalogues as:

  • exoplanet.eu
  • Open exoplanet catalogue
  • NASA exoplanet archive
  • etc.

show values of confirmed number of exoplanets between approx. 3500 and 4050.

Why do they disagree with each other?

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