太阳是一个巨大的旋转系统的中心，这个旋转系统由九大行星、它们的卫星和无数的小天体组成，包括小行星、彗星和流星体。
The Sun is the hub of a huge rotating system consisting of nine planets, their satellites, and numerous small bodies, including asteroids, comets, and meteoroids.
科学家们想知道火卫一是被火星捕获的小行星还是在轨道上形成的星体，还想了解火卫一上是否有水或曾经有过水。
Scientists would like to know if Phobos is a captured asteroid or formed in orbit, and whether it had, or has, water.
此外，科学家利用SDSS数据已经发现近5亿个天体，其中包括小行星、恒星、星系和类星体。 科学家还公布了所有这些天体最新最精确的位置、颜色和形状。
The latest, most precise positions, colours and shapes for all these objects are also being released today.
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