水星M
众神迅捷的信使。
关于 水星
水星是太阳系最小的行星，也是离太阳最近的一颗。由于几乎没有大气，其表面在灼热的白天与严寒的夜晚之间剧烈摆动。MESSENGER 与 BepiColombo 任务揭示了这颗富含铁、被古老撞击坑刻满的行星。
铁核 (半径的约 75%)、硅酸盐地幔
微量: 氧、钠、氢、氦
你知道吗？
- ·一个水星日约 176 个地球日 - 是其公转周期的两倍。
- ·尽管离太阳最近，它却不是最热的行星。
- ·没有大气，也没有卫星。
- ·表面昼夜温差达 600℃。
来自 NASA
Mercury
Mercury is the closest planet to the Sun, and the smallest planet in our solar system - only slightly larger than Earth's Moon.
Mercury is the closest planet to the Sun, and the smallest planet in our solar system. It's only slightly larger than Earth's Moon.
Mercury is the smallest planet in our solar system and the nearest to the Sun.
Mercury is only slightly larger than Earth's Moon. It's the fastest planet, zipping around the Sun every 88 Earth days. Mercury is named for the swiftest of the ancient Roman gods.
The first spacecraft to visit Mercury was NASA's Mariner 10.
NASA's MESSENGER spacecraft flew by Mercury three times, and orbited the planet for four years before crashing on its surface at the end of its mission.
Explore a curated collection of resources about Mercury.
Mercury: Exploration
The first spacecraft to visit Mercury was NASA's Mariner 10, which launched in 1973. MESSENGER launched in 2004, and was the first spacecraft to orbit Mercury.
Because Mercury is so close to the Sun, it is hard to directly observe from Earth except during dawn or twilight when the Sun's brightness doesn't outshine little Mercury. The first spacecraft to visit Mercury was NASA's
The first spacecraft sent to study Mercury.
The first spacecraft to orbit Mercury.
An international mission comprised of two spacecraft.
Mercury: Facts
Mercury is the smallest planet in our solar system and nearest to the Sun. It's only slightly larger than Earth's Moon.
Mercury is the smallest planet in our solar system and nearest to the Sun. It's only slightly larger than Earth's Moon. From the surface of Mercury, the Sun would appear more than three times as large as it does when viewed from Earth, and the sunlight would be as much as seven times brighter.
Mercury's surface temperatures are both extremely hot and cold. Because the planet is so close to the Sun, day temperatures can reach highs of 800°F (430°C). Without an atmosphere to retain that heat at night, temperatures can dip as low as -290°F (-180°C).
Despite its proximity to the Sun, Mercury is not the hottest planet in our solar system – that title belongs to nearby Venus, thanks to its dense atmosphere. But Mercury is the fastest planet, zipping around the Sun every 88 Earth days.
Mercury is appropriately named for the swiftest of the ancient Roman gods.
Mercury's environment is not conducive to life as we know it. The temperatures and solar radiation that characterize this planet are most likely too extreme for organisms to adapt to.
With a radius of 1,516 miles (2,440 kilometers), Mercury is a little more than 1/3 the width of Earth. If Earth were the size of a nickel, Mercury would be about as big as a blueberry.