尽管金星和水星没有卫星，火星却有两个卫星，更别提各有超过60个卫星的土星和木星。
While Venus and Mercury have no moons, Mars has two, while Saturn and Jupiter have more than 60 each.
金星和水星都没有卫星。
金星和水星都被观测到与月球经历相同的阶段。
Both Venus and Mercury are observed to go through phases just like the Moon.
当然4月15日小月龄的蛾眉月加入了金星和水星的会合。
Of course on April 15, Venus and Mercury were joined by a young crescent Moon.
信使号于六年前发射，穿过太阳系内部，飞越地球、金星和水星。
Messenger was launched more than six years ago, travelling through the inner solar system and embarking on flybys of Earth, Venus and Mercury.
5月11日(周三)那天，木星、金星和水星将形成一条笔直的线。
Then on Wednesday May, 11, Jupiter, Venus and Mercury will be in a very straight line ", said David L." DeBruyn.
你可以使用这份力量去发挥你的火星、金星和水星的力量。
You can use that power to exert your Mars power and Venus power and Mercury power.
该航天器与六年前启程航向内太阳系，并对地球、金星和水星从事飞近探测。
The spacecraft began its journey more than six years ago, traveling through the inner solar system and embarking on flybys of Earth, Venus and Mercury.
本月早些时候，金星和水星爬进西边的暮色中，为地球上的天空凝望者上演美丽的昏星会合。
Earlier this month, Venus and Mercury climbed into the western twilight, entertaining skygazers around planet Earth in a lovely conjunction of evening stars.
随着黎明的到来，火星和木星将继续上升，而金星和水星则落向地平线，向着升起的太阳靠近。
In dawns to come, Mars and Jupiter will continue to rise while Venus and Mercury sink toward the horizon, drawing closer to the rising Sun.
在太阳系内的行星拥有的卫星是很少的，金星和水星没有卫星，火星有两颗卫星，但跟我们的比起来就像是小小的鹅卵石。
Moons are rare in the inner solar system: Venus and Mercury don't have any, and Mars's two moons are tiny pebbles in comparison with ours.
在五月期间，人们每天早晨都可以用肉眼看见火星、木星、金星和水星，用小型望远镜还可以看见天王星和海王星。
Every morning in May the naked eye will be able to spot Mars, Jupiter, Venus and Mercury, and with a small telescope one can see Uranus and Neptune.
水星、金星、地球、火星、木星和土星的轨道恰好符合这种模式；1781年发现的天王星也同样符合该定律。
The orbits of Mercury, Venus, Earth, Mars, Jupiter and Saturn fit neatly into this pattern; Uranus, discovered in 1781, also obeyed the law.
按照它们与太阳的距离排列，这些行星分别是水星、金星、地球、火星、木星、土星、天王星、海王星和冥王星。
The planets, in order of their distance from the Sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
但有一个问题：和水星凌日不同的是，金星凌日是罕见的，大约每隔一百年会成对出现八年的时间。
But there was a problem: transits of Venus, unlike those of Mercury, are rare, occurring in pairs roughly eight years apart every hundred or so years.
这些行星跟水星，金星，地球和火星类似。
我们的地球和其他行星——水星、金星、火星、木星、土星、天王星、海王星、冥王星一起围绕着太阳旋转，构成所谓的太阳系。
Our planet Earth, together with other planets, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto revolve around our Sun in what is called our Solar system.
从底部向上依次是水星、金星、火星和木星，它们在黄道盘上延伸开来。
In order from bottom to top, wandering Mercury, Venus, Mars, and Jupiter are stretched along the ecliptic plane.
最接近它的四颗行星是石质的类地行星——水星、金星、地球和火星。
The four planets nearest it are rocky, terrestrial worlds — Mercury, Venus, Earth and Mars.
水星、金星、地球和火星通常被称为陆地行星。
Mercury, Venus, Earth, and Mars are sometimes called the terrestrial planets.
由太阳往外看，是四个小型岩石行星：水星、金星、地球和火星。
Moving away from the Sun are four tiny rocky planets, Mercury, Venus, Earth and Mars.
余下的八大行星为：水星、金星、地球、火星、木星、土星、天王星和海王星。
Eight planets officially remain: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
金星（左边较亮的那颗）和水星（右）在黄昏的天空中正接近它们预期的会合。
Venus (left) and Mercury (right) are near their much anticpated conjunction in the early evening sky.
直到1781年，占星学里所知的影响我们的行星只有5颗：水星、金星、火星、木星和土星。
Until 1781 there were only five planets known to affect us in the minds of astrologers: Mercury, Venus, Mars, Jupiter and Saturn.
太阳系内部行星的相对体积(拍自1 - r)：水星、金星、地球和火星。
Relative size of the inner planets of the solar system (from l-r) : Mercury, Venus, Earth, and Mars.
戴维l狄布恩说：“行星最紧密的会合将在5月10日(周二)发生，金星、木星和水星将形成一个紧密会合的三角，火星在左边，位于三角下方。”
The very closest grouping will come Tuesday, May 10, when Venus, Jupiter and Mercury will be in a very close-knit triangle, with Mars to the left and below the triangle.
5月13日，水星、金星和木星将形成一个“闪亮天体三角”，之后在5月20日，还会形成一个新的三角。
On May 13th, Mercury, Venus and Jupiter will form a "bright celestial triangle", and on May 20th, a new triangle will form.
太阳系内部行星的相对体积(拍自1 - r)：水星、金星、地球和火星。
Relative size of the inner planets of the solar system (from l-r) : Mercury, Venus, Earth, and Mars. New research supports the idea that Mars owes its small size to its relatively rapid formation.
例如，水星的密度比地球、金星和火星大吗？
Why, for example, is Mercury so much denser than Earth, Venus and Mars?
例如，水星的密度比地球、金星和火星大吗？
Why, for example, is Mercury so much denser than Earth, Venus and Mars?
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