The Sun Exerts a Gravitational Pull on Earth

question 162

Multiple Choice

The Sun exerts a gravitational pull on Earth. Why doesn't Earth fall into the Sun?

• A) Earth has angular momentum in its orbit around the Sun so Earth is pulled around in a circle.
• B) Earth also exerts a gravitational pull on the Sun that is equal and opposite to the pull it feels from the Sun.
• C) Earth and the Sun are kept apart by the interactions of their magnetic fields.
• D) Retrograde motion counteracts the gravitational pull and keeps Earth from falling into the Sun.

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Least Squares Estimate

A statistical technique that determines the line of best fit for a model by minimizing the sum of the squares of the vertical deviations from each data point to the line.

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The variable in an experiment or study that is expected to change in response to changes in the independent variable.