Planetary observation and deep space observation are two areas of space study. Above all, it’s exciting. Something that is easy to notice is that people who are beginners in astronomy, quickly enter the observation and study of deep space. They follow the planets they see in that period for a few days, and “immediately go” on. But both of these areas are interesting, and planetary observation is just as exciting as deep space observation. Moving planets in the sky is an interesting experience, and one event always brings excitement to astronomers — the transit of planets “across the Sun”. By moving the planets in the solar system, sometimes the planets are positioned to block part of the sun’s rays from reaching the Earth. During this period, the planets are seen as black and round shadows moving “across the Sun”.
Since the Earth is the third planet from the Sun — only the action of the two inner planets, Mercury and Venus, can be seen from the Earth. How often does the transit of Mars or Venus occur? Very rarely. Unfortunately, the action of Venus “across the Sun” will no longer occur in this century. It happened in 2004 and 2012. Mercury will make a transit “across the Sun” 27 times in this century. But when that happens — never look directly at the Sun without protection. Mercury is a small planet, and the image shows the transit and size of Mercury relative to our Sun.
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