Question

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1. A student made the following observations about astronomical bodies.

Observation 1: Mars reverses its direction of motion in the night's sky.
Observation 2: The stars move across the sky.

Which observation(s) can be explained using the heliocentric model but not the geocentric model?

Only observation 1
Only observation 2
Both observation 1 and observation 2
Neither observation 1 nor observation 2

2. The following table shows the duration of a year on some unknown planets of equal mass.


Duration of Year
Planet Duration of Year
Y 224 days
Z 320 days


Which of the following best explains which planet is closer to the sun?
Planet Y, because gravity is directly proportional to square of distance
Planet Z, because gravity is directly proportional to the square of distance
Planet Z, because the sun exerts a greater gravitational force on it than on planet Y
Planet Y, because the sun exerts a greater gravitational force on it than on planet Z

Answer 1

1 - both can be proved by the heliocentric model since it is the currently most accepted theory.

2 - since planet y has a lower planet duration year, it means it is closer and the sun exerts a higher gravitational attraction making it spin faster therefore completing the year (equivalent to one spin around the sun) in less time.


Hope it helped,

Happy homework/ study/ exam!

Answer 2

Both the statements can be proved by the heliocentric model since it is the currently most accepted theory. since planet y has a lower planet duration years.

It means it is closer and the sun exerts a higher gravitational attraction making it spin faster therefore completing the year in less time.

What is heliocentric model?

• A cosmological model in which the sun is assumed to lie at or near a central point.
• Example of the solar system or of the universe while the Earth and other bodies revolve around it.

Learn more about heliocentric model below,

https://brainly.com/question/15022652

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