What type of stars does the bar contain?

A.) Old, cool stars that glow redder.
B.) Young, cool stars that glow bluer.
C.) Old, hot stars that glow bluer.
D.) Old, cool stars that glow bluer.
E.) The bar isn't made of stars, just gas.


Answer: A.) Old, cool stars that glow redder.

Physics & Space Science

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If you shout across a canyon and the echo returns in four seconds, how far away is the other side? (Velocity of sound in air is 300 m/s)

a. 150 b. 300 c. 600 d. 1200 e. 2400 meters

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