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You are probably aware that the earth's orbit around the sun is not shaped like a perfect circle.

你可能知道，地球围绕太阳的轨道形状不像一个完美的圆。

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Astronomers have detected an asteroid not far from Earth, moving in the same orbit around the Sun.

天文学家在距离地球不远处发现一颗小行星，它与地球在同一轨道上围绕太阳运行。

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Military officials immediately offered to use the Jupiter to put a scientific satellite into orbit around the Earth.

VOA: special.2009.06.10

He would wait in orbit around the moon while Armstrong and Aldrin landed and explored the surface.

VOA: special.2009.07.15

NASA hopes that Dawn's year long orbit around Vesta will help scientists learn more about the development of the solar system, and how asteroids and other space objects were created.

VOA: special.2011.07.27

In 1960, at Cape Canaveral, Pioneer V was launched into orbit around the sun.

CNN: Wednesday,

Soon, however, the object's motion suggested it was in an orbit around the Earth.

BBC: New 'moon' found around Earth

So most dust now in orbit around earth can be assumed to be man-made.

ECONOMIST: Orbital debris