Extraterrestrial object and Natural object

Extraterrestrial object noun - A natural object existing outside the earth and outside the earth's atmosphere.

Natural object and extraterrestrial object are semantically related. In some cases you can use "Natural object" instead a noun phrase "Extraterrestrial object".

Natural object noun - An object occurring naturally; not made by man.

Extraterrestrial object and natural object are semantically related. Sometimes you can replace phrase "Extraterrestrial object" with "Natural object", this phrases are similar.