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- "The heavy bombardment of the inner planets by comets may have brought less prebiotic material to the inner solar system than we thought," said Boehnhardt. 贝哈特说：“由慧星构成的内行星的剧烈爆炸，会比我们想象的要少的生命起源物质来到太阳系内部。”
- The comet crosses the inner solar system once every 128 years as part of its elongated orbit around the Sun. 维弗特-图特尔彗星每隔128年穿过太阳系内部一次，这是它绕太阳转动轨道延长的一部分。
- In order to enter orbit at Mercury, MESSENGER is traveling on a long, looping tour of the inner solar system. 为了进入水星轨道，“信使”号在内太阳系沿漫长、往复的路线旅行。
- The Orionids meteors started as sand sized bits expelled from Comet Halley during one of its trips to the inner Solar System. 猎户座流星雨是哈雷彗星进入太阳系后受热喷发出的沙状大小的碎片。
- So there might be more of them in the Kuiper Belt (where comets come from) as compared with the inner solar system near the sun. 所以或许相比于太阳系内部，它们在“柯伊伯带”（彗星形成之地）比较多。
- The parent body of the Leonids meteor shower, Comet Tempel-Tuttle, leaves a trail of expelled sand-size particles every 33 years when it returns to the inner Solar System. 狮子座流星雨的母体就是每33年回归太阳系一次的坦普尔-塔尔特彗星喷射出的沙状微粒所留下的遗迹。
- By studying the moon, these missions may also illuminate the history of all the rocky planets in the inner solar system: Mercury, Venus, Mars and especially Earth. 藉由研究月球，这些任务也将揭露内太阳系所有固态行星的历史，包括水星、金星、火星，以及最重要的地球。
- Unbeknownst to most of us, a small but vocal group of conspiracy theorists is convinced that a rogue planet is about to enter the inner solar system and doom the Earth. 对于我们来说站不住脚，但是的确有一小部分阴谋论学着相信一个未知行星将会闯入太阳系的内部，并带来地球的终结。
- MESSENGER continues to glide through the inner Solar System and will pass Mercury again this October and next September, before entering orbit around the desolate world in 2011. 信使号将继续在内太阳系飞行，在今年十月和明年九月将再次通过水星，直至2011年进入绕水星轨道为止。
- But it would play a big role in the way comets made their way from their birth places in the planetary disc out to the Oort Cloud and on now they can return to the inner solar system. 但是，在彗星从它们在行星盘的诞生地前进到奥尔特云的方式上，以及它们能返回太阳系内部的途径上，这颗星扮演着重要的角色。"
- The solar system was formed 4.5 billion years ago. 太阳系是四十五亿年前形成的。
- A mechanical model of the solar system. 太阳系仪太阳系的机械模型
- The number of known satellites in the solar system rose to 32. 太阳系里已知的卫星数量增加到三十二个。
- from their birth places in the planetary disc out to the Oort Cloud and on now they can return to the inner solar system. 到奥尔特云的方式上，以及它们能返回太阳系内部的途径上，这颗星扮演着重要的角色。"
- Neptune is the eighth planet of our solar system. 海王星是我们太阳系里的第八颗行星。
- 90. "The heavy bombardment of the inner planets by comets may have brought less prebiotic material to the inner solar system than we thought," said Boehnhardt. 贝哈特说：“由慧星构成的内行星的剧烈爆炸，会比我们想象的要少的生命起源物质来到太阳系内部。”
- Pluto is the furthest planet in the solar system. 冥王星是太阳系中距离太阳最远的行星。
- Pluto is the farthest planet in the solar system. 冥王星是太阳系中最远的行星。
- Such a tilt is unusual in the solar system. 这样的倾斜在太阳系中不常见。
- There are nine planets in the solar system. 在太阳系中有九大行星。
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