The Solar System: Ancient Astronomers, Gravity, and Planetary Motion

The video explores the evolution of our understanding of the solar system, starting with the belief that Earth was the center, to Copernicus's heliocentric model. It explains how planets orbit the sun, the role of gravity in maintaining these orbits, and the concept of inertia in planetary motion. The video concludes with an introduction to the planets closest to the sun.

Who proposed the idea that Earth and other planets revolve around the sun?

• Galileo Galilei

• Isaac Newton

• Nicholas Copernicus

• Albert Einstein

What is the path called that planets follow as they revolve around the sun?

• Circuit

• Route

• Orbit

• Trajectory

What force keeps the planets in their orbits around the sun?

• Electricity

• Magnetism

• Friction

• Gravity

What would happen to the planets if there was no gravity?

• They would stop moving

• They would collide with each other

• They would move closer to the sun

• They would fly off into space

What is the tendency of moving objects to stay in motion called?

• Acceleration

• Velocity

• Inertia

• Momentum