Mercury

Mercury is the smallest and innermost planet in the solar system. It is named after the Roman deity Mercury, the messenger of the gods. It has a diameter of about 4,880 kilometers, which makes it smaller than the largest natural satellites in the solar system. Mercury has a very thin atmosphere, and its surface is heavily cratered and similar in appearance to Earth's moon.

Key Facts about Mercury:

• Orbital period: 88 Earth days
• Surface temperature: Ranges from -173°C to 427°C
• Distance from the Sun: 57.9 million kilometers
• Atmosphere: Very thin and composed mainly of oxygen, sodium, and hydrogen
• Surface features: Craters, plains, and cliffs

Study Guide:

Here are some key points to remember about Mercury:

1. Mercury is the smallest planet in the solar system.
2. It has a very thin atmosphere and no moons.
3. Mercury has a highly elliptical orbit, which means its distance from the Sun varies significantly throughout its year.
4. The surface of Mercury has been shaped by volcanism, tectonics, and impact cratering.
5. Mercury's surface is heavily cratered, similar to the moon, and has expansive plains and cliffs.

Remember to study the key facts and the study guide to gain a better understanding of Mercury!