[Answer] 1. The smallest and closest planet to the Sun is Mercury. Why is it difficult to study Mercury?

Step 1 : Introduction to the question "1. The smallest and closest planet to the Sun is Mercury. Why is it difficult to study Mercury?"

...1. Because it is too small 2. Because it is always behind the Sun 3. Because it is hidden by Venus 4. Because of its closeness to the Sun It was not until the 1970s that radar imaging was used and the Mariner 10 space probe was able to send back some images. Although Mercury has areas of smooth plains, it is heavily cratered like our Moon. It has no moons and almost no atmosphere. Mercury is the messenger of the Roman Gods.

Step 2 : Answer to the question "1. The smallest and closest planet to the Sun is Mercury. Why is it difficult to study Mercury?"

Because of its closeness to the Sun:

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