The Eight Planets八大行星
Eight planets travel around the Sun. Some are small and rocky. Some are giant balls of gas and ice.八颗行星绕着太阳转。有的小小的、是岩石做的，有的是巨大的气体和冰组成的球。
See it in 3D去看3D版Simple explanations简单说一说
What is a planet?什么是行星？
A planet is a big round world that travels around a star. In our Solar System, that star is the Sun.行星是围绕恒星转的大圆球。在我们的太阳系里，这颗恒星就是太阳。
Remember the order记住顺序
From the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.从太阳往外数：水星、金星、地球、火星、木星、土星、天王星、海王星。
Meet the planets认识行星
Rocky planets岩石行星
Mercury水星
Rocky planet岩石行星
The smallest planet, closest to the Sun.最小的行星，离太阳最近。
Spin it in 3D3D转一转Venus金星
Rocky planet岩石行星
The hottest planet, wrapped in thick clouds.最热的行星，被厚厚的云包着。
Spin it in 3D3D转一转Earth地球
Rocky planet岩石行星
Our home, the only place we know with life.我们的家，目前唯一已知有生命的地方。
Spin it in 3D3D转一转Mars火星
Rocky planet岩石行星
The Red Planet, explored by robot rovers.红色星球，有机器人火星车在探索。
Spin it in 3D3D转一转Giant planets巨行星
Jupiter木星
Gas giant气态巨行星
The biggest planet, with a giant storm.最大的行星，有一场巨大的风暴。
Spin it in 3D3D转一转Saturn土星
Gas giant气态巨行星
The planet with the beautiful rings.有美丽光环的行星。
Spin it in 3D3D转一转Uranus天王星
Ice giant冰巨行星
The pale blue planet that spins on its side.淡蓝色的行星，是“躺着”转的。
Spin it in 3D3D转一转Neptune海王星
Ice giant冰巨行星
The windy, deep blue planet far away.遥远、多风、深蓝色的行星。
Spin it in 3D3D转一转How big are they? (Compared with Earth)它们有多大？（和地球比一比）
- Mercury水星× 0.38
- Venus金星× 0.95
- Earth地球× 1
- Mars火星× 0.53
- Jupiter木星× 11.2
- Saturn土星× 9.45
- Uranus天王星× 4
- Neptune海王星× 3.88
Width across the middle, compared with Earth. Jupiter is about 11 times wider than Earth.横跨中间的宽度，和地球相比。木星大约比地球宽11倍。
Did you know?你知道吗？
- Pluto is a dwarf planet. It is smaller than the eight planets.冥王星是矮行星，比八大行星都小。
- Planets do not make their own light. They shine because they reflect sunlight.行星自己不发光，我们看到它们是因为它们反射了太阳光。
Quick quiz小测验
Which planet is the biggest?哪颗行星最大？
Jupiter is so big that more than 1,300 Earths could fit inside.木星非常大，里面能装下1300多个地球。
Which planet is called the Red Planet?哪颗行星被叫做“红色星球”？
Rusty iron in the dust makes Mars look red.尘土里生锈的铁让火星看起来是红色的。
Which planet is closest to the Sun?哪颗行星离太阳最近？
Mercury is first in line from the Sun.水星是离太阳最近的第一颗行星。