Which of the following characteristics is a feature of all planets? A They all have atmospheres.
B They all make their own light.
C They all have rings of rock and gas.
D They all are round and made up of rock.

ANSWER: A. They all have atmospheres.

Choice A) They all have atmospheres

Explanation:

Let's go through the four answer choices to see which are true and which are false.

A) This is true. The gravity from the planet holds the gas atmosphere from escaping into space.B) This is false. Only stars make their own light. The light you see from other planets is the reflection of star light, most notably the sun's light.C) This is false. Some planets don't have rings of rock and/or gas orbiting around them. Saturn is one planet that does, but Jupiter does not.D) This is false for all planets. If you said "terrestrial planets", then it would be true. In general however, a planet like Jupiter is made of gasses and not rock. We consider this a gas giant.

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