Assertion: moon | /r/HasProperty | hollow
Facets:
Source sentences:
text: it's size that it may be possible, like Phobos that the moon is hollow.
text: This fact together with various research proves that the Moon is a hollow object.
text: Speculation that Moon is hollow
text: The Hollow Moon hypothesis, or Spaceship Moon hypothesis, proposes that Earth's Moon is either wholly hollow or otherwise contains a substantial interior space.
text: The Hollow Moon hypothesis is the suggestion that the Moon is hollow, usually as a product of an alien civilization.