Fill in the blank: The geocentric model says that the ______ is at the center of the cosmos or universe, and the planets, the sun and the moon, and the stars circle around it.

The heliocentric model considers the sun as the center, and the planets revolve around the sun.

Who were the strong supporters of the geocentric theory according to the passage?

According to Copernicus' model, what is the center of the cosmos?

Fill in the blank: The motion of the celestial bodies is uniform, eternal, and ______ or compounded of several circles.

In the geocentric model, which celestial body is considered the center of the universe?

In the heliocentric model, the sun is considered as the center of the universe, and the celestial bodies move around the sun.

Who discovered the force of gravity around the mid 1600s?

Newton’s Law of Universal Gravitation states that any two objects in the universe have gravity and will attract each other.

Gravity is an ______ (pull) between two objects.

Gravitational Force is a ______-contact force that causes attraction between objects.

What two factors affect the strength of gravitational force between two objects?

Mass is the amount of ______ in an object and does not change when an object changes locations.

Weight is a measure of the force of ______ pulling on an object.

An object's weight changes when the object changes locations based on the pull of ______ on the object.

If you were on the Moon, you would still have the same mass you did on Earth; however, your weight on the Moon would be one-sixth of your weight on Earth. This is because the Moon has a ______ mass than Earth and a ______ gravitational pull.

This Law explains why you come back down to Earth when you jump. (Earth's gravitational pull is stronger than your upward motion.) Which law is being described?

Inertia is an object's tendency to ______ a change in motion.

Gravity and inertia keep Earth in orbit around the Sun and the Moon in orbit around the Earth. An ______ is the circular path one object travels around another object.

A model is:

A reduction (from original to smaller) has a scale factor less than 1. Which of the following is an example of a model reduction?

An enlargement (from original to larger) has a scale factor greater than 1. Which of the following is an example of an enlargement?

A scale model is:

A scale is:

An 18 ft long car would have a scale factor of 2 ft = 1 cm. How many cm would the car be in the model?

An Astronomical Unit (AU) is:

Which of the following planets are considered inner planets?

The inner planets are also known as ______ planets because they are made of or having to do with solid rock.

Terrestrial planets are denser and smaller because they are made of rock.

Which of the following statements is true about outer planets?

Gaseous planets are less dense and larger because they are made of ______.

Asteroids are metallic, rocky objects in space that are too small to be considered ______ planets.

The asteroid belt is a doughnut-shaped ring located between the orbits of ______ and ______.

A comet is a mass of ______ and ______ dust particles that look like giant dirty snowballs.

Comets are in the outer reaches of our solar system called the ______ Belt beyond Neptune, with millions of other comets in an area called the ______ Cloud.

When a comet flies near the Sun in its orbit, a tail forms of gas and dust that always points ______ from the Sun.

When Earth passes through a comet's dust, burning particles can be seen streaking through the sky in a display called a meteor shower.

A comet has three parts called a ______, ______, and a ______.

What is the spherical blob of gases that surrounds the nucleus of a comet called?

What is the frozen center of a comet composed of ice, gas, and dust called?

What is the trail of dust and gas that forms opposite of the Sun as it boils away from a comet called?

Meteors are tiny chunks of space rocks dislodged from comets, planets, asteroids, or moons.

What are meteoroids that enter Earth's atmosphere and burn up due to friction, creating a bright streak of light in the sky called?

A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky.

What is a small body in outer space, distinguished as an object significantly smaller than asteroids, called?

What are meteoroids that don’t burn up completely when traveling through the atmosphere and land on Earth’s surface called?

Impact craters are craters on a planet or moon caused by the impact of a meteorite or other object, typically circular with a raised rim.

What is the raised outer edge of an impact crater that extends above the height of the local surface called?

What are bright streaks of impact material thrown for great distances from a crater called?

What is the central uplift in the middle of a crater caused by settling of impact material called?

What is the explosion and ejection of materials at the impact site called?

Alabama has an impact crater in which city?

The crater diameter in Wetumpka, Alabama is 5 miles wide and occurred 84 million years ago.