Per NASA, the goals of the Apollo program were: to bring humans to the moon and back to Earth safely. to create technology that would help meet space exploration goals. to be the first to land a human on the moon. to study and explore the moon. to develop man's capability to work on the moon. Apollo 9 launched in 1969. Its mission was to test the lunar model, the part of the space vehicle that would take the astronauts to the moon. The astronauts in the lunar module tested its engines and equipment while they orbited Earth. Which specific NASA goal did Apollo 9's mission focus on?

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explanation:

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answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

your answer is, orbit around the nucleus