What is a galaxy?

• a star and it's surrounding planets
• billions of stars held together by gravity
• the big bang
• a cluster of nebulas

What type of electromagnetic radiation has the longest wavelength?

• gamma
• x-ray
• radio
• infrared

What type of electromagnetic radiation has the shortest wavelengths?

• microwaves
• visible light
• ultra violet
• x-rays

What type of EMR is heat?

• radio
• infrared
• visible
• ultra violet

What type of EMR does the Sun produce?

• ultra violet
• all of the above
• visible light
• gamma

What type of EMR do we use for communication?

• infrared
• visible
• x-ray
• radio

If a star is moving toward us the spectral lines will be

• blue shifted
• red shifted
• green shifted
• pulsating

If a star is moving away from us the spectral lines will be

• blue shifted
• red shifted
• green shifted
• pulsating

What element made up about 75% of the early universe

• Hydrogen
• Helium
• Oxygen
• Carbon

What is the second most abundant element in the Universe?

• Hydrogen
• Helium
• Cargon
• Oxygen