WordNet
n. an object occurring naturally; not made by man [ant: artifact]
Usage examples of "natural object".
The most remarkable natural object is, of course, the Norfolk Island pine, which rears its stately head a hundred feet above the surrounding forest.
Accordingly, the tenderest affection which a beneficent Father allows, as a partial compensation to the mother for the pains and lacerations of her heart, incident to the maternal relation, was, in my case, diverted from its true and natural object, by the envious, greedy, and treacherous hand of slavery.
I am no stranger to the faults and defects of the subverted government of France, and I think I am not inclined by nature or policy to make a panegyric upon anything which is a just and natural object of censure.
As it lay to the north-east of the Julian Alps, that important territory became a natural object of dispute between the sovereigns of Italy and of Illyricum.
There was much thin luminosity between, and no details could be observed, but it was surely no natural object.
But its orbit seems too similar to the Earth's for it to be a natural object.