Astronomy › Section H · The Moon, Mercury, Venus, and Mars › Topic H.4
Mercury
At first glance Mercury looks like a slightly larger copy of the Moon. Look closer and it turns out to be one of the strangest planets: a giant iron ball under a thin rocky shell, with a day twice as long as its year.
In this topic
- The innermost planet
- Size and a surprising density
- Worked example: Mercury's density
- An iron planet with a magnetic field
- A slow spin locked to its orbit
- Worked example: the length of a day
- Extreme temperatures
- A Moon-like but different surface
- How did Mercury lose its rock?
- Common mistakes to avoid
- Key takeaways
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