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2. It is the closest planet to the sun.
1. Its orbit takes 88 days.
3. It usually can't be seen because it's so close to the sun.
5. Mercury is named after the swift messenger of Gods in Roman mythology.
4. Mercury has no moons.
6. It has a thin atmosphere because of its relationship to the sun and size.
7. Mercury is believed to be once volcanic.
8. Mercury has a very weak gravitational field.
9. Heavily cratered surface suggests Mercury hasn’t changed much since the beginning.
10. Temperatures can range from -173 degrees Celsius and 427 degrees Celsius.
6. Our sun is a main-sequence G2 star, one of more than 100 billion more in the solar system.
1. The Sun is about 70% hydrogen and 28% helium
7. At the center of the core the Sun's density is more than 150 times that of water.
9. The Sun's energy output is produced by nuclear fusion reactions.
10. The surface of the Sun, called the photosphere, is at a temperature of about 5800K.
4. Sunspots are caused by complicated interactions with the Sun's magnetic field.
2. Sun emits a low density stream of charged particles known as the solar wind
3. Since the formation of the solar system the Sun's output has increased by about 40%.
8. The Sun is about 4.5 billion years old.
5. The Sun is in the top 10% of biggest stars by mass.
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