Question

1. choose all that apply.

choose two facts about pluto.
□ pluto’s orbit crosses that of neptune’s.
□ a day on pluto is 1.9 earth days long.
□ charon is pluto’s only moon.
□ it takes 248 earth years for pluto to orbit the sun.

1. choose the best answer.

pluto is sometimes unofficially considered a double planet system because ______
○ it is shaped like two smaller planets stuck together
○ it crosses neptune’s orbit
○ its moon charon is almost the same size as pluto
○ it has a halo around it when viewed in a telescope

Explanation:

Question 5

1. Pluto's orbit does cross Neptune's orbit, so this is a correct fact.
2. A day on Pluto (its rotational period) is about 6.4 Earth days, not 1.9, so this is incorrect.
3. Pluto has five known moons (Charon, Styx, Nix, Kerberos, Hydra), so "only moon" is wrong.
4. Pluto's orbital period around the Sun is about 248 Earth years, so this is a correct fact.

So the two correct facts are "Pluto’s orbit crosses that of Neptune’s" and "It takes 248 Earth years for Pluto to orbit the sun."

• Option 1: Pluto's shape isn't two planets stuck; it's a dwarf planet with a moon system. Eliminate.
• Option 2: Orbiting Neptune's orbit doesn't relate to being a double planet system. Eliminate.
• Option 3: Charon is very large relative to Pluto (about half its size), so their barycenter is outside Pluto, leading to the double - planet - like consideration. Correct.
• Option 4: A halo (atmosphere - related) doesn't make it a double planet system. Eliminate.

Answer:

• Pluto’s orbit crosses that of Neptune’s.
• It takes 248 Earth years for Pluto to orbit the sun.

Question 6