Which model of the solar system has Earth in the middle?

Which model of the solar system has the sun at the center?

Kepler discovered that planets do NOT orbit the sun in a perfect circle. Instead, they orbit in ____________ orbits.

What color is seen when galaxies are moving away?

Which theory states the universe started with a singularity that suddenly expanded?

What theory shows galaxies are moving apart by looking at wavelengths of EM radiation?

How old do scientists believe the universe is?

What was the temperature like immediately after the Big Bang?

What do we need to find in a galaxy to produce young stars?

Where is our solar system located inside of the Milky Way galaxy?

How do scientists know about the universe?

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