ESS1.1 and ESS1.2 Universe Expansion and Gravity Flashcard Review

Front

What is gravity?

Back

Gravity is a force that attracts two bodies towards each other. It is responsible for keeping planets in orbit around stars and objects on the ground.

Front

What are the main elements that compose stars?

Back

Stars are primarily composed of Hydrogen and Helium.

Front

What does a redshift in a star's spectral lines indicate?

Back

A redshift indicates that the star is moving away from us at a faster speed.

Front

What is an orbit?

Back

An orbit is the path that a planet or other celestial body follows as it moves around a star or planet.

Front

How does mass change when moving to a different planet?

Back

Your mass remains the same regardless of the planet you are on; however, your weight will change due to the different gravitational forces.

Front

What is the relationship between gravity and mass?

Back

The strength of gravity between two objects is directly proportional to their masses; the more massive an object, the stronger its gravitational pull.

Front

What is the Big Bang Theory?

Back

The Big Bang Theory is the leading explanation for the origin of the universe, suggesting it began from a singular point and has been expanding ever since.

Front

What is the role of gravity in the universe?

Back

Gravity is the force that governs the motion of celestial bodies, keeping planets in orbit around stars and galaxies together.

Front

What is a light-year?

Back

A light-year is the distance that light travels in one year, approximately 5.88 trillion miles (9.46 trillion kilometers).

Front

What is the difference between rotation and revolution?

Back

Rotation is the spinning of an object around its own axis, while revolution is the movement of an object around another object.