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Mercury formed about 4.5 million years ago when gravity pulled swirling and dust together to form this small planet nearest the Sun. Like its fellow terrestrial planets, Mercury has a central core, a rocky mantle and a solid crust.
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Mercury's highly eccentric, egg-shaped orbit takes the planet as close as 29 million miles (47 million kilometers) and as far as 43 million miles (70 million kilometers) from the Sun. It speeds around the Sun every 88 days, traveling through space at nearly 29 miles (47 kilometers) per second, fa...
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Mercury's surface resembles that of Earth's moon, scarred by many impact craters resulting from collisions with meteoroids and comets. Craters and features on Mercury are named after famous deceased artists, musicians or authors.
Temperatures on the surface of Mercury are extreme, both hot ...
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Mercury's environment is not conductive ot life as we know it The temperatures and solar radiation that characterize this planet are most likely too extreme for organisms to adapt to.
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Day: 176 Earth days
Year: 88 Earth days
Radius: 1,516 miles | 2,439.7 kilometers
Planet type: Terrestrial
Temperature: 800 degrees Fahrenheit, 430 degrees Celsius/ -290 degrees Fahrenheit ...
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Instead of an atmosphere Mercury possesses a thin exosphere made up of atoms blasted off the surface by the solar wind and striking meteoroids. Mercury's exosphere is composed mostly of oxygen, sodium, hydrogen, helium and potassium.
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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.
From an average distance of 36 million miles (58 million kilometers), Mercury is 0.4 astronomical un...
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Mercury's magnetic field is offset relative to the planet's equator.
Though Mercury's magnetic field at the surface has just one percent the strength of Earth's, it interacts with the magnetic field of the solar wind to sometimes create intense magnetic tornadoes that funnel the fast, hot ...
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Mercury is the second densest planet, after Earth. It has a large metallic core with a radius of about 1,289 miles (2,074 kilometers), about 85 percent of the planet's radius.
There is evidence that it is partly molten, or liquid. Mercury's outer shell, comparable to Earth's outer shell (c...
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The smallest planet in our solar system and nearerst to the Sun,
Mecury is only slightly larger than the 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 bright...
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When the solar system settled into its current layout about 4.5 billion years ago, Venus formed when gravity pulled swirling gas and dust together to form the second planet from the Sun.
Like its fellow terrestrial planets, Venus has a central core, a rocky mantle and a solid crust.
When the solar system settled into its current layout about 4.5 billion years ago, Mars formed when gravity pulled swirling gas and dust in to become the fourth planet from the Sun.
Mars is about half the size of Earth, and like its fellow terrestrial planets, it has a central core, a rock...
Uranus took shape when the rest of the solar system formed about 4.5 billion years ago, when gravity pulled swirling gas and dust in to become this ice giant.
Like its neighbor Neptune, Uranus likely formed closer to the Sun and moved to the outer solar system about 4 billion years ago, wh...
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