Question

which of the following best describes the difference between stars and planets in the night sky?
planets appear fixed in constellations, while stars wander across the sky.
stars appear fixed in constellations, while planets wander against the starry background.
stars change their position relative to one another, while planets stay fixed in place.
both stars and planets move randomly across the night sky.

Explanation:

To determine the correct answer, we analyze the motion of stars and planets:

• Stars are very far away, so their relative positions to each other (forming constellations) appear fixed over human timescales.
• Planets are much closer (within our solar system) and orbit the Sun, so they appear to "wander" (change position) against the background of fixed stars (constellations).

Now we evaluate each option:

• First option: Incorrect. Planets wander, stars are fixed in constellations.
• Second option: Correct. Matches the analysis of star and planet motion.
• Third option: Incorrect. Stars’ relative positions are fixed; planets move.
• Fourth option: Incorrect. Stars are fixed relative to each other, planets move in predictable orbits (not random).

Answer:

B. Stars appear fixed in constellations, while planets wander against the starry background.