U5W4 Light Detectives

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Why are astronomers called "light detectives"?

They look for life on other planets.

They build satellites to explore the solor system.

They carefully study how the sun's rays reflect off of objects.

They look for patterns in the stars to predict the future.

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Reread "Discovering Pluto" on page 353. Based on paragraph two, what does a "blink comparator" do?

It compares the orbits of different planets.

It compares two images to show movement.

It compares the brightness of two stars.

It compares distance between two objects.

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Reread "Scanning the Kuiper Belt". What happens next after the Brown's team takes repeated pictures of the night sky?

The CIT computers superimpose the images on top of each other.

The astronomers analyze the data and track movement.

A 161 camera is mounted to the telescope.

In 2003, the team discovers a slow moving bright shape.

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Reread "Combining New Data with Old". Because Eris's atmosphere has a high level of frozen nitrogen which reflects light, what is Brown's team believe?

They discovered Pluto.

They calculated that Eris takes 560 to orbit the sun.

They believe there could be more dwarf planets in the Kuiper belt.

They thought Eris was much larger than it was.

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What happened as a result of Brown's discover of Eris?

They created the blink comparator to look for moving objects.

They created a method of superimposing images on top of each other.

They demoted Pluto to a "dwarf planet".

They could see that Eris was about the same size as Pluto.

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Brown was able able confirm his belief that Eris affected that orbits of other planets.

Nokorɛ

Ɛnyɛ ampa

1

How did technology lead to the discovery of Pluto and Eris?

Clyde Tombaugh invented the blink comparator.

Gerard Kuiper believed that a disk-like region of objects on the edge of the solar system.

Astronomers used multiple computers to superimpose images on top of each other.

Brown was able to confirm the effects of Eris by using old photographs.

Brown's team overestimated the size of Eris.

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Based on the text, what is a deduction?

a wild guess

a repetative sound

to continue for a time

an idea arrived through observation

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Eris was discovered to move quickly around the sun.

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Ɛnyɛ ampa

1

U5W4 Light Detectives

Why are astronomers called "light detectives"?

Reread "Discovering Pluto" on page 353. Based on paragraph two, what does a "blink comparator" do?

Reread "Scanning the Kuiper Belt". What happens next after the Brown's team takes repeated pictures of the night sky?

Reread "Combining New Data with Old". Because Eris's atmosphere has a high level of frozen nitrogen which reflects light, what is Brown's team believe?

What happened as a result of Brown's discover of Eris?

Brown was able able confirm his belief that Eris affected that orbits of other planets.

How did technology lead to the discovery of Pluto and Eris?

Based on the text, what is a deduction?

Eris was discovered to move quickly around the sun.

What features of Expository text are found in "Light Detectives"? Choose all that apply.

Why are astronomers called "light detectives"?

Reread "Discovering Pluto" on page 353. Based on paragraph two, what does a "blink comparator" do?

Reread "Scanning the Kuiper Belt". What happens next after the Brown's team takes repeated pictures of the night sky?

Reread "Combining New Data with Old". Because Eris's atmosphere has a high level of frozen nitrogen which reflects light, what is Brown's team believe?

What happened as a result of Brown's discover of Eris?

Brown was able able confirm his belief that Eris affected that orbits of other planets.

How did technology lead to the discovery of Pluto and Eris?

Based on the text, what is a deduction?

Eris was discovered to move quickly around the sun.

What features of Expository text are found in "Light Detectives"? Choose all that apply.