Cosmos - Episode 4

 What does William Herschel mean when he tells his son there is a “sky full of ghosts”?

• They are flying all around and going...Boo!
• The light from faraway stars can take many years to reach Earth. By the time it reaches us the Stars may already be dead.
• Stars are ghosts because they only come out at night.

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CCSS.RI.5.4

CCSS.RI.6.4

CCSS.RL.5.1

CCSS.RL.5.4

CCSS.RL.6.4

How fast does light travel in space

• 100,000 kilometers per hour
• way fast, yo!
• 300,000 kilometers per second

Why do we see the sun rise before it is over the horizon?

• Light allows our eyes to time travel
• The surface of the Earth is curved
• We don't. It's an optical illusion. 
• The Earth's atmosphere bends the light.

How far away is Neptune (not that other place) from the earth in light hours?

• 4
• 40
• 14

How long would it take the Voyager Spacecraft to reach the nearest star in our galaxy?

• 8000 plus years
• 800 plus years
• 80,000 plus years

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CCSS.6.RP.A.3D

Using the idea of how fast light travels, how do scientists know our universe is older than 6500 years?

• We know objects are farther away then 6500 light years away. Therefore light from them would not have had enough time to reach us.
• We don't really know, it's all guess work.
• The universe is 6500 years old.

How far away is the oldest galaxy we’ve every discovered?

• 13.4 billion light years
• 134 billion light years
• 1.34 billion light years
• Like, dude, so far away.

Why does no one know what happened before the Big Bang?

• No one has ever asked that question before
• No one was there watching with a cellphone camera
• No evidence survives from before that moment

How long after the Big Bang did it take for stars to form?

• a few thousand million years
• a few hundred million years
• a few billion years

Who discovered field forces that act on us even when we’re not touching other objects?

• Isaac Newton
• James Maxwell
• William Herschel
• Michael Faraday