这两组行星的构成物质根据熔点分为三类：气体、岩石和冰。
The substances that make up both groups of planets are divided into three groups—gases, rocks, and ices—based on their melting points.
然而，如今的类地行星与木星不同，几乎没有轻气体和冰。
However, unlike Jupiter, the terrestrial planets today are nearly void of light gases and ices.
一开始你可能不会这样认为，因为太阳系里和彗星发生过碰撞的行星都比火星还远，在那样的轨道上水永远是以冰的形式存在。
On first blush, you might think not: the planet where the comet or comets came to grief is farther out than Mars, in an orbit where water would be permanently frozen.
冥王星在2006年被降格至一个新创造的类别，“矮行星”，部分原因是在那之前一年，在冥王星的轨道附近，一颗名叫厄里斯的冰态天体被发现。
Pluto was demoted to a newly created category, "dwarf planet," in 2006, partly because of the discovery a year earlier of Eris, another icy body from Pluto's neighborhood.
这颗行星可能拥有一个“热冰”的表面，由于受到行星引力的压缩，水虽然受热但依然保持固态。
It might have a surface of "hot ice" - water that remains solid despite its heat because it gets compressed by the planet's gravity.
他们发现的一种遍及该行星表面的物质，其化学成分与水结成的冰极其匹配。
And the chemical signature they saw was a good match for water ice, which they found all over the asteroid.
只有少数星球在大小上接近于我们所居住的这颗行星，而且也只有这其中的少数可能像地球一样呈岩石状，而不是像木星那样呈气态状或海王星那样的冰状。
Just a handful are close in size to our planet, and only a few of those may be rocky like the Earth, rather than gaseous like Jupiter or icy like Neptune.
土星外面有一圈冰冷的土星环，可能是遥远时期它的一颗由冰和岩石组成卫星的遗留物，而这颗卫星已经被土星这个巨大的气质行星撕裂、吞噬了。
The icy rings of Saturn could be what's left of an ancient ice-rock moon that got stripped and swallowed by the gas-giant planet. Christopher Intagliata reports.
有理论认为地球上的水可能是由其它小行星以冰的形态运送而来，如今的这一发现为该理论提供了有力佐证。
The find provides support for the theory that Earth's water could have been delivered as ice by an asteroid.
这些环，有成千上万个，是由数十亿个冰和岩石的粒子所组成，这些粒子被认为是彗星、小行星和粉碎卫星的碎片。
The rings—there are thousands—are made up of billions of ice and rock particles, thought to be pieces of comets, asteroids, or shattered moons
根据2010年4月28日的宣布，科学家利用美国宇航局的红外望远镜设备已检测到小行星表面有水-冰和碳-基有机化合物。
Announced on April 28, 2010, scientists using NASA's Infrared Telescope Facility have detected water-ice and carbon-based organic compounds on the surface of an asteroid.
天文学家们已经不再把小型，冰状天体，比如冥王星已被规为行星了，但无论如何，它们围绕其它恒星时是无法探测到的。
Small, icy objects such as Pluto are no longer regarded as planets, but in any case, they would be undetectable around another star.
拥有硅酸盐金属核心与冰质幔层的大量已分化小行星是最佳选择。
A large, differentiated satellite - with a core composed of silicates and iron, and a lighter mantle made of water ice - would be a good choice.
NASA航天器也已经在红的行星的其它地区查明怀疑的水冰的巨大的商店，包括南方极地的地区。
The NASA spacecraft has detected vast stores of suspected water ice in other areas of the red planet as well, including the south polar region.
小行星的冰可能是地球上的水是从哪里来的这一难题最好的答案。
This ice on asteroids may be the answer to the puzzle of where Earth's water came from.
现在看来，在太阳系初期行星和小行星首次形成时，冰深深地延伸进入主带区域。
It now appears when the asteroids and planets were first forming in the very early Solar System ice extended far into the Main Belt region.
土星距离太阳的位置排在太阳系各行星的第6位，并且由于其易于辨认，经常被用于图解，土星的光环主要由冰、尘埃以及宇宙碎片组成的。
The 6th planet from the Sun and frequently used as an illustration due to easy recognition, it's rings are composed mainly of ice, dust and cosmic debris.
以前曾经认为，小行星过于温暖而不能在它们的表面上保持水冰。
It had previously been thought that asteroids were too warm to retain water ice on their surfaces.
西弥斯女神24上的冰可能是来自早期太阳系的一种时间囊，并且可能类似于也许已经在猛烈轰击期间从小行星到达地球上的冰。
The ice on Themis 24 could be a sort of time capsule from the early solar system and could be similar to the ice that may have arrived on Earth from asteroids during the Heavy Bombardment.
至少有一个行星被一层薄薄的冰层覆盖，这些冰可能就是地球上水的来源。
Because at least one asteroid appears to be coated by a thin layer of ice. And just that kind of asteroidal frosting could have been the source of our water here on Earth.
至少有一个行星被一层薄薄的冰层覆盖，这些冰可能就是地球上水的来源。
Because at least one asteroid appears to be coated by a thin layer of ice. And just that kind of asteroidal frosting could have been the source of our water here on Earth.
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