How many stars are in a galaxy.

A giant collection of gas, dust, and billions of stars held together by gravity is known as a _____________________ .

All of space, including all of the matter and energy within it is known as the ________________.

The universal force that attracts, or pulls, all objects that have mass toward one another.

A large, nearly round object that moves around a star.

Which class of planets is made of rocks and metals?

Which class of planets is made mostly of Hydrogen and Helium.

A class of planets that orbit the Sun, just as true planets do, but do not have enough mass to clear, or sweep up all other bodies in their orbit is known as _____________________ .

The Sun and all of its satellites is known as the _____________________.

An object that revolves around another object is known as a _________________________.

The force of gravity between two objects depends on the ______________ of the objects and the __________________ between them.

What do all of the inner planets have in common?

Which one is larger?

How does being farther from the Sun affect an object?

What are two pieces of evidence for the Big Bang?

Hubble's Law States that

This is the first planet from the Sun; it is very hot in the day and very cold in the night.

The fourth planet from the Sun; also known as the "red planet."

The sixth planet from the Sun; known for its large rings.

These are the 4 planets (Mercury, Venus, Earth, Mars) are known as

This is the eighth (last) planet from the Sun; it is deep dark blue in color.

These are the four planets the Sun; Jupiter, Saturn, Uranus, and Neptune are classified as

Where is the Asteroid Belt located in the Solar System?

Which planet has the most gravity?

What factor causes one planet to have more gravity than other planets

How many moons does Earth have?

How many planets does the solar system have?

Which planet is the closest planet to the sun?

How many stars in our solar system?