Question

Two spacecraft (that we know of!) have visited the planet Mercury. Name one of them.

1) Mariner 10
2) Messenger
3) Voyager 1
4) Cassini

Answer 1

Both Mariner 10 and MESSENGER have visited Mercury, with Mariner 10 being the first in 1974 and MESSENGER orbiting and mapping the planet from 2011 to 2015.

Step-by-step explanation:

Among the options given, both Mariner 10 and MESSENGER are spacecraft that have visited the planet Mercury. Mariner 10 was the first to provide a close-up look at Mercury in 1974, transmitting over 2000 photographs back to Earth, while the MESSENGER mission, launched in 2004, went into orbit around Mercury in 2011 and provided detailed mapping of the planet's surface until its end in 2015.