PEC U Activity 5 checkpoint

If an object is moving toward us, its spectrum will experience

• no shift
• red shift
• black spectrum
• blue shift

Hubble observed that galaxies are

• expanding
• moving away from us
• moving towards us
• standing still

In red shift, the wavelengths of light become

• Bluer
• shorter
• longer

What happened after the Big Bang?

• The universe expanded
• Nothing
• The universe shrank
• The universe imploded

Which color has the highest frequency?

• red
• orange
• green
• blue

High frequency waves have _________ wavelengths.

• varying
• long
• the same
• short

A collection of stars, dust, and gas bound together by gravity is...

• Universe
• Solar System
• Planet
• Galaxy

The most common elements stars are made of...

• Iron & Carbon
• Gold & Zinc
• Hydrogen & Helium
• Fire and Ice

The distance that light travels in one year...

• Light year
• Quantumyear
• Stellar-year
• 1 million kilometers

The universe is expanding!  This means that:

• all of the galaxies are spreading out.
• the universe must have started from a single point.
• the universe is cooling down.
• all of the above.