Which of the following is not one of the factors of the Drake equation?

What is anything that comes from beyond Earth?

What is the condition in which there is no resistance to the pull of gravity?

What is a self-contained and self-sustaining natural system?

What is a feeling experienced in free fall, that there is no gravity?

Which of the following would be most important for astronauts to take into space with them?

Which of the following would be most important for astronauts to have in space?

Which of the following would be a program that may most likely be available at Space Camp in Huntsville, AL?

Why would people bring plants into space?

What is a way of estimating the chances of communicating with extraterrestrials?

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