Comets formed in circular orbits but were gravitationally flung into their present-day elliptical orbits when they ventured too close to planets.

彗星在圆形轨道上形成，但当它们冒险太接近行星时，就会被引力抛入现在的椭圆轨道。

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The nearly circular orbits of planets in our solar system led scientists to expect that planets around other stars would also reside in circular orbits.

在我们的太阳系中，行星的轨道几乎是圆形的，这使得科学家们预测，其他恒星周围的行星也会位于圆形轨道上。

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Now, circular orbits are special.

圆形轨道非常特殊。

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Often, exoplanets just get tugged from their orginal, near-circular orbits into more eccentric ones, the simulations showed.

MSN: Alien planets face danger from double-star systems

The eight regular satellites include four large objects discovered by Galileo and four small objects in circular orbits interior to that of the major volcanic moon Io.

BBC: More moons for Jupiter

In particular, one thing that I noticed in reading this book is how the insistence on simplicity and elegance, whether that be as a matter of geocentrism, or circular orbits, or a steady state universe, cause even some of the most intelligent people in history to ignore the evidence.

FORBES: The Weekly E-Book Reading List