Unit 2: Tools of Astronomy

How do we observe the visible universe?

• Visible color

• Our eyes

• Telescopes

• Electromagnetic Spectrum

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This limitation of a refracting telescope is called what? *HINT* two words

Why are radio telescopes so big? *HINT* there are two answers

• They have to pick up faint EM waves (radio waves)

• They have to deal with Earth's atmosphere

• They can collect EM data that optical telescopes cannot "see"

• We used radio telescopes to image our very first black hole in 2019! Super cool science in action!

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How does the Newtonian design fix limitations with the refracting telescope (Check all that apply)

• No more chromatic aberration (colors bend at different angles)

• No more lens warping if telescope is too big

• No more atmospheric refraction

• The allow you to look directly at the sun

What is both the greatest advantage and disadvantage of Nasa's space telescopes like Hubble?

• It uses a Cassegrain compound telescope to collect data

• It has an Intel processing chip from 1998

• It runs solely on solar power

• It is in space

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How does a larger aperture (a bigger objective) help us see stars?

(The James Webb telescope will have an objective 15 times bigger than Hubble)

• Great photo effects

• Limits light polluiton

• Collects more light

• Helps us see further into the stars

What happens when you go beyond resolution of a telescope?

• Images become blurry and/or pixelated

• You see the ugly side of stars

• images become more clear and crisp

• you see one headlight instead of two

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How does a telescope helps us see the stars?

• Massive magnifying power helping us to see further

• Limits light pollution

• They act like a bucket (objective) with a big funnel that collects light, helping us to see stars

• They don't help, astronomers just like big toys

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Why do stars twinkle in the night sky?

• Stars increase and decrease brightness

• The atmosphere refracts the light

• Stars are always moving

• It's an illusion and a conspiracy

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What is it mean if light is "redshifted"?

• Light shifts to the red spectrum of the rainbow as things move away

• Light shifts to the blue spectrum of the rainbow as things move towards us

• What happens when you put on red tinted glasses

• What happens when you shine a light through a prism and see a rainbow

• Light is becoming CHROMATICALLY ABERRATED

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