Unit 1 Part 1 Solar System and Universe Review

Front

What is the Universe?

Back

The Universe is space together with all the matter and all the energy in it.

Front

Who proposed the geocentric model of the solar system?

Back

Ptolemy proposed the geocentric model of the solar system.

Front

What is the Solar System?

Back

The Solar System is the Sun and all the planets and other bodies that orbit it.

Front

What did Newton propose kept planets in orbit around the Sun?

Back

Newton proposed that gravity and inertia kept planets in orbit around the Sun.

Front

What is retrograde motion?

Back

Retrograde motion is the apparent backward movement of a planet as observed from Earth.

Front

What are epicycles?

Back

Epicycles are small circles that planets move along while orbiting Earth in the geocentric model.

Front

What is a galaxy?

Back

A galaxy is a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter.

Front

What is an astronomical unit (AU)?

Back

An astronomical unit (AU) is the average distance from the Earth to the Sun, about 93 million miles.

Front

Who was Galileo?

Back

Galileo was an astronomer who supported the heliocentric model and made significant contributions to observational astronomy.

Front

What is inertia?

Back

Inertia is the tendency of an object to resist changes in its state of motion.