At last astronomers have something that they can realistically compare with the eight-planet system that includes the Earth.

最终，天文学家们也就实际拥有能与包含地球的八星体系相提并论的东西。

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Saturn is the second biggest planet in the solar system.

土星是太阳系的第二大的行星。

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Our planet Earth, together with other planets, revolve around our Sun in what is called our Solar system.

我们的行星地球，连同其他行星，围绕我们的太阳旋转，这就是我们的太阳系。

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In that event,astronomers were able to observe the icy comet long before it struck the solar system's biggest planet.

VOA: special.2009.08.25

Mars Day at the Smithsonian Air and Space Museum in Washington is a celebration of our solar system's most famous planet.

VOA: special.2010.07.28

This most recent collision with Jupiter brought attention to how the huge planet's gravity affects our solar system.

VOA: special.2009.08.25

At the start of the upcoming season four of the TV series, the Calamari planet system is at the center of a fierce battle between the Republic and the Separatists.

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But in constructing the first atmospheric model that has the orbital dynamics of a star-planet-moon system fully included, astronomers Duncan Forgan, at the Royal Observatory in Edinburgh, and David Kipping, at the Harvard Smithsonian Center for Astrophysics in Cambridge, turn that idea on its head.

FORBES: Earth-Like Exo-Moons Can Lurk Well Beyond Planetary Habitable Zones, Say Astronomers

This is the second system discovered where a planet is orbiting two stars, and the first system discovered with multiple planets orbiting two stars.

FORBES: NASA Finds Multiple Planets Circling Binary Star System