Mercury is very hard to observe from Earth because:
A)it always appears as only half lit from Earth.
B)it never gets more than 28 degrees from the Sun's glare.
C)its elliptical orbit causes it to change speed unpredictably.
D)its barren surface reflects too little sunlight; it is almost invisible always.
E)its very rugged surface does not allow radar to bounce back to Earth.

Question

Quizplus · Accepted Answer

Mercury's proximity to the Sun means that it never strays too far away from the Sun's glare, making it difficult to observe from Earth. It never gets more than 28 degrees away from the Sun as seen from Earth, which means that it can only be seen shortly after sunset or before sunrise, when the Sun is below the horizon. Mercury never gets more than 28 degrees from the Sun's glare, making it very difficult to observe from Earth.

Mercury Is Very Hard to Observe from Earth Because