Why is Mercury usually hard to see without a telescope?
Answer (3)
To see Mercury with your naked eye is only possible when it is at its greatest "elongation" or basically when the angle of separation between the Sun or Mercury is at it's greatest value, however it is not always a promised success of viewing Mercury. It also depends on the phase of the plant to determine how bright it is!
Mercury is hard to see from Earth because it's so close to the bright sun. It is the closest planet to the sun and the smallest of all the 8 big planets. Mercury is only a little bigger than Earth's moon.
Mercury is hard to see without a telescope due to its close proximity to the Sun and the limited angles at which it can be viewed. It is best seen during its greatest elongation, appearing as a bright star in twilight, but visibility is brief and depends on phase and location. Overall, these factors make it easy to overlook despite its brightness.
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