Planets that have a hard, rocky surface.

A bowl-shaped depression on the surface of a moon or planet.

The Gas Giants

Which of the following are characteristics of terrestrial planets?

Ancient people thought these dark areas of the Moon were seas of water. Scientists now know they are large, flat areas of dark-colored rock. We call them _____.

The overall term for any body that revolves around another object on an orbital path.

Which of the following is the correct order of the planets from closest to the Sun to farthest away?

These are five smaller objects that also revolve around the sun. (Ceres, Haumea, Makemake, Eris, and Pluto)

A chunk of rock or metal that passes through the Earth's atmosphere and hits the Earth's surface. They also impact the surface of other planets and moons.

A _________ is a chunk of rock or metal that creates a bright streak in the sky as it burns up in the Earth's atmosphere.

The widespread death of entire species of living organisms. Scientists think that asteroid impacts have caused these.

Made mostly of ice (frozen gases) and a bit of rock and dust....these objects have a recognizable "tail" and extremely long orbits. They are most visible as their orbit nears the sun and will often "disappear" for long periods of time as they travel on their orbit back to the outer solar system.

The path an object takes as it revolves around another object is called ________.

To spin on an axis. The Earth does this once every 24 hours. This movement gives us day and night.

To move around another object on an orbital path. The Earth takes 365 and 1/4 days to do this movement. This movement (along with the tilt of the Earth) gives us seasons.

The terrestrial planets.

The asteroid belt is the area where chunks of rock and debris orbit the sun in between ______ and ______.

Humans have walked on the moon. (TRUE or FALSE)

Which space object is at the center of the solar system and provides the gravity to hold the planets and other bodies in their orbital paths?

The force of attraction between all objects in the universe is called _________.

As an object's mass increases, its gravitational force _________.

As the distance between two objects increases, the gravitational force between them _________.

Mostly made of gases, many moons, planetary rings, colder, larger, and farther from the Sun....these are all characteristics of ___________.

The moon rotates once every 27.3 days.

The moon also revolves around the Sun once every 23.7 days. This means that....

Smaller than a planet, these bodies revolve around a parent planet. The Earth has one and a planet such as Jupiter has many.

What is the most massive object in our solar system?

In our solar system...

Planets, moons, and other bodies tend to have "elliptical" orbits. This means that their path around another object is _____-shaped.

Distances in our solar system are so great, that scientists based their measurement on the "distance from the Earth to the Sun." One of these lengths is called ____________.

Scientists believe that an impact with a large asteroid caused pieces of the Earth to fly outward into space....

Gravity collected these pieces and created another space object. Which object was this?

What stage in its life cycle is the Sun currently experiencing?

What is at the center of our solar system?

What are the two main elements (gases) that make up the sun?

Where are stars born?

What is an area of intense gravity that is so strong that not even light can escape?

What determines the color of a star?

Which star color is the hottest?

What holds all of the planets in their orbits within our solar system?

Which layer of the sun is cooler in temperature and is a "glowing red" in color?

Which layer of the sun is the very center of the sun where nuclear fusion occurs???

Which layer of the sun is seen as a "crown-like" ring around the outside edge of the sun?

Which layer of the sun is an outer layer that we see as the "shining, visible surface" of the sun?

In the sun, what happens during nuclear fusion?

Which is FALSE about the sun?

The sun is made up of superheated gases that have a positive electrical charge! What is this stuff called?

Which stage in the life cycle of a star occurs when a star runs out of hydrogen to fuse, it gets bigger, and it cools down?

Which stage in the life cycle of a star occurs when a star can no longer do nuclear fusion, the stars shrinks to its core, and it eventually just fades out?

What do scientists call "massive explosions" of stars?

What is a nebula?

The sun is just one of millions of ______ found within the Milky Way Galaxy.

An extremely hot ball of glowing gas is called a _______.

The scientific name for "particles of light."

The inner layer of the sun where hotter material is rising outwards, cooling, and sinking back inwards.

What process creates intense temperatures and incredible amounts of energy within the core of the sun?

The sun, the planets and their moons, and other bodies held by the sun's gravity in their orbits...these all make up the....?

The ________ includes all matter, space, energy, and time.

(It is everything that exists)

There are three main types of galaxies.

Which of the answers below is NOT one of the three main types of galaxies?:

What is the only part of the electromagnetic spectrum that can be seen by the human eye?

How long ago do cosmologists believe the universe began with the Big Bang?

Which best represents what happened after the Big Bang? (what is the correct order of events)

Our galaxy is called the _______ galaxy and it is a ______ galaxy.

The ideas about our universe have changed throughout time based upon scientific observations and discoveries. (TRUE or FALSE)

Which of the following are ways that humans can study the universe?

(Check all that apply)

Which is in the correct order from largest to smallest?

Researchers who were studying the origins (beginning) of the universe discovered areas of heat that were leftover from the Big Bang.

What did they call this evidence?

A ________________ is an instrument that collects electromagnetic radiation from space objects and allows us to see those objects in much better detail.

They often utilize mirrors or lenses to gather and focus energy from space objects.

With the help of computers, some can even gather invisible electromagnetic radiation to create pictures!

Astronomers estimate that the universe contains about 100 billion galaxies. (TRUE or FALSE)

Edwin Hubble was an astronomer who...

The Big Bang theory is a well accepted theory that...

Which of the following is NOT a part of the Big Bang Theory?

Which of the following can be found within galaxies?

On the electromagnetic spectrum...

______________ have the largest wavelength and _____________ have the smallest wavelength.