space

Sometimes, electromagnetic waves are completely ______ from Earth's atmosphere.

• absorbed
• reflected
• focused
• blocked

What light does an optical telescope gather/focus?

•  UV light
•  gamma rays
•  visible light
• infrared radiation

What is the shortest electromagnetic wave?

• Radiowaves
• microwaves
• ultraviolet rays
• gamma rays

What speed to light waves travel at per second? 

• 400km
• 100,000km
• 300,000km
• 299,792 km

What is the longest electromagnetic wave?

• gamma rays
• radio waves
• microwaves
• infrared laser

What does a refracting telescope do?

• concentrates light from distant objects
• concentrates light from nearby objects
• focuses light from distant object
• focuses light from nearby objects

Electromagnetic waves travel through ______

• Empty space
• solids
• liquids
• gases

A wave with a large wavelength will have a ______ frequency and _____ energy

• high, low
• high, high
• low, high
• low, low

A _________________ telescope uses a curved mirror to collect and focus light. 

• refracting telescope
• reflecting telescope
• optical telescope

Which of the following allowed astronauts to explore the moon?

• Gemini

• Apollo

• Mercury

• Skylab