Unit 3 Review

The outer planets are small, rocky planets with iron cores.

• True
• False 
• Neither 
• Both 

A meteor, is actually a meteorite that burns up in the Earth's atmosphere. 

• True
• False
• Neither 
• Both

A group of stars, gas and dust held together by by gravity is a _______ . 

• galaxy
• constellation
• Local Group
• both a and b 

The outer planets are mainly composed of which of the following? 

• hydrogen and oxygen
• hydrogen and helium
• helium and oxygen 
• nitrogen and helium

Which of the following is a common trait of the inner planets? 

• They are the same size.
• The atmospheres are made up of the same gases. 
• They all have water.
• They all have a solid outer layer. 

All of the outer planets have which of the following? 

• both moons and ring systems
• just moons
• just ring systems
• none of the above; Saturn has rings while the rest have moons. 

What is the basic shape of every planet's orbit? 

• circle 
• elipse
• oval 
• egg

Its _____ makes Sirius the brightest star in the night sky.

• apparent magnitude
• parallax
• color
• absolute magnitude

A galaxy that has a shape similar to a football is a(n) _____ galaxy. 

• normal spiral 
• barred spiral 
• elliptical 
• irregular

Why do artist feel it necessary to represent the inner planets with a pulled out piece (such as in the image above). 

• They thought it was prettier
• The distances between the planets in the outer part of the solar system are so great that drawing everything on the same scale makes it impossible to represent the inner planets.
• The distances between the planets in the inner part of the solar system are so great that drawing everything on the same scale makes it impossible to represent the outer planets. 
• It is a more dramatic representation.