In addition to the planets and moons seen in this simulated photo, our solar system contains a star, asteroids and comets, and dwarf planets such as Pluto.

除了在此模拟的照片里所看到了行星和卫星外，我们的太阳系统还包含一个恒星、一些小行星和彗星，和像冥王星那样的侏儒行星。

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The outer comet ring orbits from 35 to 90 astronomical units from the star; our solar system's analogous Kuiper Belt extends from about 30 to 50 astronomical units from the sun.

外侧那些沿着轨道运行的彗星距离恒星最远90个天文单位，最近35个天文单位；我们太阳系中的柯伊伯带与太阳的距离为30到50个天文单位。

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Although our solar system only has one star, most stars like our sun are not solitary, but are binaries where two stars orbit each other a pair, or multiples involving even more stars.

虽然我们的太阳系只有一颗恒星，但其实大部分和我们太阳相似的恒星都不是单个的，而是由两个恒星相互旋转组成的双星系统，或者甚至包含更多恒星的多星系统。

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Or so suggests new observations of a nearby bright solar type star that is a close analogue to our own.

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This implies that one solar-like star out of three harbours such planets.

BBC: Trio of 'super-Earths' discovered

On Wednesday, Dr. Welsh and his colleagues announced that they have confirmed the existence of two more worlds in distinctive double-star solar systems in the constellation Cygnus.

WSJ: Galaxy Hosts 100 Billion Planets, in New Estimate