Answers2001310 Earth Science Sem 1 - PearsonThe Expanding Universe

Star Systems and Galaxies Answers

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A binary star system is made of [___] stars, one of which is brighter than the other. Astronomers are able to detect the dimmer star because its gravity causes the bright star to [___]. Astronomers can also spot the dimmer star by observing a phenomenon called a(n) [___] binary. This happens when the dim star passes in front of the bright star.

Answer:

two

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Which statement does Lola need to correct, and why?

A
Statement 1 because spiral galaxies do not have arms.
B
Statement 2 because the bulges contain mostly young red stars.
C
Statement 3 because the arms are made of mostly young blue and blue-white stars.
D
Statement 4 because spirals galaxies contain little to no dust.
3

Use the drop-down menus to identify each type of galaxy pictured.

Answers:
Galaxy A::elliptical galaxy
Galaxy B::irregular galaxy
Galaxy C::spiral galaxy
4

Solve log812 = x – 2 . Round your answer to four decimal places.

A
Option
B
Option
C
Option
D
Option
5

Why was science fiction an ideal genre for expressing fears that arose from the Cold War? Check all of the boxes that are correct.

A
It showed frightening visions of what could happen if society followed certain paths.
B
It played on people's fears of being invaded by an enemy with superior technology.
C
It was acceptable because people knew that such fears could never come true.
D
It let authors safely analyze controversial issues of the present by putting them in the future.
E
It assured readers that technology would always save them from foreign threats.

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