Final answer:
Observers on Earth will see a lunar eclipse when an astronaut on the Moon experiences a solar eclipse, as the Moon moves into Earth's shadow.
Step-by-step explanation:
When an astronaut on the Moon experiences a solar eclipse, observers on Earth would see a lunar eclipse. Observers on Earth will see a lunar eclipse when an astronaut on the Moon experiences a solar eclipse, as the Moon moves into Earth's shadow.
This occurs because a solar eclipse on the Moon happens when the Moon moves into the shadow of Earth. During a lunar eclipse, the Moon enters Earth's shadow, and this event can be seen from the night side of Earth. Hence, the geometry of a lunar eclipse enables it to be visible to anyone who can see the Moon at that time.