The best replacement for celestia is stellarium.

The best alternatives to celestia are rated as following:
★★★★★  stellarium
★★★★  luna
★★★★  chrysalis
★★★★  nightmare moon
★★★  sombra
★★★  space engine
★★  book of moon
★★  universe sandbox
★  discord
★  queen chrysalis
★  king sombra
★  princess luna
★  molestia
★  garoth
★  starlight road
  black garden
  twilight sparkle
  orbiter
  pulling the rug

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Google Trends

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celestia
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