What is an atmosphere?

What is the universe?

What are atoms?

What are twin stars?

What is a telescope?

What is a black hole?

What is a galaxy?

What is a solar system?

What is gravity?

What is a solar flare?

What is matter?

What is a planet?

What is a nebula?

What is nuclear fusion?

What is an aurora?

Define rotate.

Define revolve.

What is the milky way?

What is a sunspot?

What is a prominence?

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