Mercury Can Be Seen Easily from Earth Only

question 591

Multiple Choice

Mercury can be seen easily from Earth only:

• A) during a lunar eclipse, when the sky is sufficiently dark near the Moon, because Mercury is always close to the Moon in the sky.
• B) at midnight, when it is high in the sky.
• C) when Mercury is near the Sun, just after sunset or just before sunrise.
• D) in the winter, when the ecliptic plane is high in the sky at night.