What force keeps celestial bodies in a regular predictable motion?

Describe the effect of gravity on the planets.

Explain gravity

What is responsible for causing ocean tides?

Why does Earth's tilted axis cause seasons?

What causes day and night on Earth?

What causes the moon phases?

What is the sun?

Why don't solar and lunar eclipses occur every month?

Which celestial bodies are most likely to have many craters?

Why are the inner planets called terrestrial planets?

What causes a high surface temperature on Venus?

Why is Venus sometimes called Earth's twin?

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