What is a Galaxy?

• Collection of comets

• Collection of meteorites

• Collection of stars

• Collection of satellites

Earth's only natural satellite is

• The sun

• The Moon

• The solar system

• International space station

What is a comet?

• Huge stones

• Huge ball of dust

• Huge snowballs

• Huge ball of gases

Any meteor that makes it to the ground is called a

• Meteor

• Meteorite

• Meteoride

• Asteroid

Between the orbits of Mars and Jupiter there is a an

• Meteorite belt

• Dust and stone belt

• Asteroid belt

• Gas ball belt

What is the Universe?

• Billions of stars

• Billions of planets

• Billions of solar systems

• Billions of galaxies

The inner planets are called

• Gas giants

• Terrestrial planets

• Dusty planets

• Natural planets

The outer planets are called gas giants; they are made mainly of gases such as :

• Nitrogen and oxygen

• Hydrogen and oxygen

• Hydrogen and helium

• Helium and nitrogen

All of the planets orbit the Sun. Each orbit is slightly squashed circle called

• Asteroid

• Meteorite

• Solar system ring

• An ellipse

Terrestrial planets ( inner planets) are made up of

• Gases

• Dust

• Rock

• Meteors