Question

1a) If you lived on Jupiter, which planets would exhibit retrograde motion like that observed for Mars from Earth? (Select all that apply.)

a) Mercury

b) Venus

c) Earth

d) Mars

e) Saturn

f) Uranus

g) Neptune

1b) Which would never be visible as crescent phases? (Select all that apply.)

a) Mercury

b) Venus

c) Earth

d) Mars

e) Saturn

f) Uranus

g) Neptune

Answer 1

Most of the planets move around the Sun in east or Direction but planets including Venus Uranus and Pluto rotating in Westward Direction.

This is known as retrograde motion.

It is generally defined as an occasional backward motion of a planet as seen from Earth

This motion is not really but it just appears to do so depend on the relative position of planet Moon and how planets are moving around the Sun.

The retrograde motion is for earth Venus and Mercury.

Crescent phases for Saturn Uranus and Neptune