The Oort Cloud is a theoretical object in the solar system that Professor Childermass believes has been disturbed, thereby causing more comets to be seen (The Chessmen of Doom, 66-7).


In 1950, Dutch astronomer Jan Oort postulated the existence of an immense spherical cloud surrounding the planetary system. Comets are observed to come to the solar system from all directions, therefore the place where the comets come from is thought to be this sphere, dubbed the Oort Cloud and extending approximately 30 trillion kilometers from the Sun. Although its existence has not yet been proven through direct observation, the reality of the cloud is widely accepted in the scientific community[1].


  1. Wikipedia: Oort cloud

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