Astronomy 1 Vocabulary Review

a scientific model that explains how the universe began about 14 billion years ago. It states that the universe started as a single point, then expanded and stretched to grow as large as it is today

• Big Bang Theory

• Solar System

• Universe

• Rotation

Tags

NGSS.HS-ESS1-2

the idea that the Earth is the center of the universe, with the sun, moon, and planets revolving around it. The word comes from the Greek words meaning "earth" and "pertaining to a center".

• Geocentric Theory

• Inertia

• Solar System

• Milky Way Galaxy

is a force of nature that pulls objects toward each other, even if they aren't touching. It's what keeps us on the ground, makes things fall, and keeps planets in orbit around the sun

• Gravity

• Planets

• Heliocentric Theory

• Revolution

Tags

NGSS.MS-ESS1-2

NGSS.MS-ESS1-1

NGSS.MS-PS2-4

something which has the sun at its center, or is referred to or measured from the sun's center. For example, our solar system, meaning the Earth revolves around the sun, not the other way around

• Heliocentric Model

• Solar System

• Inertia

• Universe

Tags

NGSS.MS-ESS1-2

A property of matter that describes an object's resistance to changes in its motion. It can also be defined as a tendency not to move or change. For example, when a car turns, a person's body resists the change in direction and feels a slight pull.

• Inertia

• Rotation

• Scientific Theory

• Geocentric Theory

A large group of stars, dust, and gas in space. It's called a barred spiral galaxy because it has a bar in the center and many arms that extend out from it. When viewed from above or below, it would look like a spinning pinwheel

• Milky Way Galaxy

• Gravity

• Planets

• Big Bang Theory

Tags

NGSS.MS-ESS1-2

A celestial body that orbits a star, like our sun, and meets three conditions:

• Orbit: Orbits the star in a circular or elliptical orbit.

• Gravity: Has enough gravity to overcome rigid body forces and assume a spherical shape.

• Clearance: The gravity has cleared away any objects of similar size near its orbit.

• Planets

• Big Bang Theory

• Revolution

• Solar System

Tags

NGSS.MS-ESS1-2

NGSS.MS-ESS1-3

The orbital motion of one object around another. For example, Earth moves around the sun in a counterclockwise direction, which takes 365 and 1/4 days to complete. This is what causes a year.

• Revolution

• Rotation

• Milky Way Galaxy

• Planets

Tags

NGSS.MS-ESS1-2

NGSS.MS-ESS1-1

The circular motion of an object around its center, or axis. For example, Earth spins on its axis every 24 hours, which causes day and night.

• Rotation

• Big Bang Theory

• Heliocentric Theory

• Scientific Theory

Tags

NGSS.MS-ESS2-6

A well-substantiated explanation of how or why something in the natural world works or happens. It's based on observations, facts, and hypotheses that can be tested and corroborated using the scientific method.

• Scientific Theory

• Geocentric Theory

• Gravity

• Inertia

Tags

NGSS.MS-PS2-4

NGSS.MS-PS1-2