Earth and Gravity, HR Diagram and Electromagnetic Spectrum

What force attracts a body toward the center of another physical body having mass?

• gravitropism

• gravity

• astrobiology

• none of these

What determines the gravitational strength of an object?

• Mass and weight

• Mass and distance

• Distance and density

• Density and mass

What causes all of the planets in the solar system to orbit around the Sun?

• the Sun's magnetic field pulls on all of the planets due to the metal core of each planet

• the massive size and mass of the Sun creates an extremely strong gravitation force that holds all planets in orbit

• the planets orbit the Sun due to its very fast rotational speed causing the graviton effect

• none of these

The gravity on the outer planets of our solar system is not as strong as the inner planets. Why is this?

• the inner planets are smaller and therefore have less gravity than the larger outer planets

• gravity is the same on all planets in the solar system regardless of their size and distance from the Sun

• none of these

• the outer planets are further away and therefore gravity is weaker than on the inner planets

True or False? The closer an object is to another the stronger the gravitational force.

• True

• False

• Not enough information to answer the question

An astrobiologist has found a two new planets orbiting a star similar to our own Sun. Planet A is closer than Planet B. Which planet will be affected the least by the gravitational pull of the star?

• Planet B

• Planet A

• neither planet will be affected by the gravitational pull of the star

• the gravitational pull will not be noticeable

If mass ____________ the force of gravity increases. If distance _____________ the force of gravity will decrease.

• increases, decreases

• decreases, increases

• stops, increases

• none of these

________________ the movement of Earth one time around the Sun.

• Orbit

• Rotation

• Revolution

The Earth is ALWAYS moving.

• True

• False

A force that pulls things toward the center of earth is called _________.

• friction

• motion

• gravity