F3 : Stars and Galaxies

A __________________________ is a huge collection of stars, gases, and dust that is classified by shape.

• galaxy
• Big Bang Theory
• light-year

The distance between stars is measured in units called __________________.

• astronomical unit
• light-year
• Milky Way

According to the  ________________________, the universe formed from a single point and is still expanding.

• Milky Way
• star
• Big Bang Theory

Earth and the rest of the solar system are located in the galaxy ___________________.

• Milky Way
• star
• Andromeda

The Local Group is a ___________________ made up of approximately 30 galaxies.

• light-year
• cluster
• star

A  _________________________ is a sphere of very hot, burning gas.

• star
• galaxy
• moon

........... pulls clusters of stars together in most galaxies.

• air
• Big Bang Theory
• gravity

Galaxies interact and sometimes ..........

• divide apart.
• merge together.
• dissolve.

Matter in the universe is _______ when a star explodes.

• recycled
• lost
• purple

According to most scientists, the universe formed 13 to 14 _________ years ago.

• million
• billion
• trillion