Intro to

What is the Solar System? The Solar System is the ________ bound system of the Sun and the objects that orbit it.

• gravitationally

• chemically

• magnetically

• electrically

How old is the Solar System?

• 4.6 billion years old

• 1 billion years old

• 10 billion years old

• 500 million years old

Fill in the blank: A ______ is a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction. We are part of the Milky Way ______.

• galaxy

• planet

• asteroid

• comet

Based on the diagram, the Milky Way Galaxy is located within the Local Galactic Group.

• True

• False

What does the universe include?

• Only planets

• Only stars

• Planets, stars, galaxies, and all other forms of matter and energy

• Only galaxies

Fill in the blank: The Big Bang theory is the current theory of how the _______ formed.

• universe

• solar system

• galaxy

• planet

The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.

• True

• False

Fill in the blank: The Sun is the ____ that the planets of our solar system orbit around.

• star

• planet

• comet

• asteroid

How far is one Astronomical Unit (AU), which is also the distance between the Earth and the Sun?

• About 39 million miles

• About 93 million miles

• About 150 million miles

• About 9 million miles

Fill in the blank: The Sun is the center of our ____ system.

• solar

• lunar

• stellar

• galactic