Question

1. choose all that apply.

choose two ways that the four outer planets differ from the inner planets.

• they have no moons.
• they are the largest in the solar system.
• they are rocky.
• they are gaseous.

1. choose the best answer.

how does a planet appear when viewed by the human eye?

• it appears to shine steadily.
• it appears as a greenish or reddish disk.
• it twinkles and changes brightness.
• planets can be seen only through telescopes.

Explanation:

Question 8

• "They have no moons": Outer planets (like Jupiter, Saturn) have many moons, inner planets (Mercury, Venus) have few or none. So this is incorrect.
• "They are the largest in the solar system": Outer planets (Jupiter, Saturn) are the largest, inner planets are smaller. Correct.
• "They are rocky": Inner planets are rocky, outer are gaseous/icy. Incorrect.
• "They are gaseous": Outer planets (Jovian) are gaseous, inner (terrestrial) are rocky. Correct.

• "It appears to shine steadily": Planets don't twinkle (unlike stars) and shine steadily. Stars twinkle due to atmospheric distortion.
• "It appears as a greenish or reddish disk": Human eye can't see planets as disks (need telescope).
• "It twinkles and changes brightness": Stars twinkle, planets don't.
• "Planets can be seen only through telescopes": Planets like Venus, Jupiter are visible to naked eye.

Answer:

B. They are the largest in the solar system, D. They are gaseous (assuming options are labeled as A: They have no moons, B: They are the largest in the solar system, C: They are rocky, D: They are gaseous)

Question 9