Unit 4: Astronomy Part 2 Pre and Post Test

How much of the nebula matter became the Sun?

• 33%
• 66%
• 99%
• 77%

How long ago did the solar system begin to form?

• 5 billion years ago
• 50 million years ago
• 5 million years ago
• 50 billion years ago

What is the shape of a planet's orbit?

• circular
• elliptical
• spherical
• round

If a planet is closer to the sun, its orbit will be _____ than one farther away. 

• longer
• slower
• bigger
• shorter

The average distance between the Earth and the sun is a(n) ____.

• light year
• light minute
• astronomical year
• astronomical unit

Kepler's 2nd Law states that a planet's velocity is ____ when farther from the sun.

• fastest
• slowest
• unchanged
• the same

Stars are formed from big clouds of gas and dust is known as:

• dust cloud

• space fog

• neutron clouds

• nebulae

A star is born when:

• nuclear fusion starts

• a nebula becomes a protostar

• gases in a nebula condense

• hydrogen is used up in fusion processes

When the core of a Red Giant collapses it becomes a:

• White Dwarf

• Supernova

• Red Supergiant

• Black Hole

Our sun is currently in what star stage?

• Protostar

• Nebula

• Main Sequence

• Red Giant