As far as I know, there are no man-made objects as big as this.

据我所知，再没有像它这样大的人造物体了。

youdao

People often mistake some man-made objects such as a kite or a balloon for a UFO.

人们常常把一些人造的物体，诸如风筝、气球错认成飞碟。

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They offer a sharper look that more clearly distinguishes man-made objects from rocks. The closest images are of the Apollo 17 site from 1972.

照片的清晰度足矣让我们区分出其上是岩石还是人造物，距离最近的一张照片是阿波罗17号的着陆点（如图），这也是迄今为止距此着陆点最近的一张照片。

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The number of man-made objects in Earth orbit has been growing each year.

VOA: special.2009.04.01

Man-made objects buried under shifting sands, such as pipes or water aqueducts, are particularly good at reflecting microwaves.

ECONOMIST: Archaeology: What lies beneath | The

It blasted a disused weather satellite into tiny fragments that threaten the safety of other man-made objects in space.

ECONOMIST: After a successful Olympics, China��s next spectacular

The debris is essentially the residue of hundreds of rocket launches, exploration missions and other man-made objects left circling Earth.

WSJ: Falling Satellite Debris Might Hit U.S.