Unit 9 Lesson 2: Gravity and the Universe

Front

What does it mean to simulate in science?

Back

To simulate means to create a model or representation of an event or process to study its behavior or outcomes.

Front

What is a planetary system?

Back

A planetary system consists of objects such as planets and a star or stars that are held together by gravity.

Front

Who proposed the nebular hypothesis?

Back

The nebular hypothesis was proposed by Immanuel Kant.

Front

Why do all of the planets orbit the sun rather than Earth?

Back

All of the planets orbit the sun because the sun has more mass than Earth.

Front

How does gravity affect the formation of the solar system?

Back

Gravity pulled particles together, forming clumps that eventually grew into the sun and the planets.

Front

What is gravity?

Back

Gravity is a force that attracts two bodies toward each other, depending on their masses and the distance between them.

Front

What role does mass play in gravity?

Back

The greater the mass of an object, the stronger its gravitational pull.

Front

What is the Milky Way?

Back

The Milky Way is the galaxy that contains our solar system, along with billions of other stars and their planetary systems.

Front

What is a star?

Back

A star is a massive, luminous sphere of plasma held together by gravity, undergoing nuclear fusion.

Front

What is the difference between a planet and a star?

Back

A planet orbits a star and does not produce its own light, while a star generates light and heat through nuclear fusion.