Gravity in our universe

Gravity is a fundamental force that attracts and holds objects together. Earth's gravity pulls everything towards its center, including the moon, keeping it in orbit. The Sun, with its massive gravitational pull, keeps all planets in the solar system in their orbits. Our galaxy, the Milky Way, contains about 200 billion stars, each exerting gravitational forces that hold the galaxy together. Beyond our galaxy, gravity is the force that maintains the structure of billions of galaxies in the universe, making it one of the most crucial forces in existence.

What role does Earth's gravity play in relation to the moon?

• It has no effect on the moon.

• It causes the moon to spin faster.

• It keeps the moon in Earth's orbit.

• It pushes the moon away from Earth.

Why doesn't Earth drift away into space?

• Because of the gravitational pull of the moon.

• Because of the gravitational pull of the Sun.

• Because of the gravitational pull of other planets.

• Because of its own gravitational pull.

What is the primary reason the Sun can keep all planets in orbit?

• It is the hottest object in the solar system.

• It is the closest object to the planets.

• It is the brightest object in the solar system.

• It has the largest mass in the solar system.

Approximately how many stars are estimated to be in the Milky Way galaxy?

• 200 million

• 200 billion

• 2 billion

• 20 billion

What force is responsible for keeping the universe intact?

• Magnetism

• Electricity

• Nuclear force

• Gravity