Asteroids are minor planets, most of which circle the sun in a region known as the asteroid belt, between the orbits of Mars and Jupiter.

小行星是较小的行星，它们中的大部分在火星和木星轨道间的小行星带中环绕太阳运行。

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The three planets are all relatively large, having masses between five and 13 times that of Jupiter, according to a report published in Science this week.

据本周出版的《科学》杂志的一份报告称，这三个行星都相对较大，质量是木星的5至13倍。

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We're also good at seeing big clouds of small particles of dust. ... But in between dust grains up to a millimeter in size and the smallest planets we can see, we're blind.

我们也同样擅长于发现那些一大堆的尘埃...但是如果要去发现那些毫米级的尘埃，和那些我们能看到的最小的行星，我们几乎就成了盲人。

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In fact, there's a property of gravitational fields anywhere, even in outer space, but there is some residual field between all the planets and all the stars in the universe, that the force on a body is proportional to the mass of the body.

实际上,这是任何地方的引力场都具备的属性,甚至是在外太空,在所有的行星和恒星之间,存在着某种剩余场,在这个场里作用在物体上的力,和物体的质量之间存在比例关系

耶鲁公开课 - 基础物理课程节选

In other words, the gap between the heaviest-known planets and the smallest stars has all but closed.

ECONOMIST: Twinkle, twinkle, giant planet

In theory, this should provide a clear distinction between stars and planets.

ECONOMIST: Twinkle, twinkle, giant planet

Hughes's best explanation for this series of events is something known as a triple conjunction between Jupiter and Saturn - with the two planets coming close together in the sky three times over a short period.

BBC: Star of Bethlehem: The astronomical explanations