How far is a light year?
A) nearly 10 trillion km
B) the distance of one Earth orbit
C) 300,000 km
D) All of the above
Correct Answer:
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Q14: The nearest star system closest to our
Q15: A radio signal emitted from Earth would
Q16: The Milky Way galaxy is about
A)4 light
Q17: The background stars during a solar eclipse
Q18: A light year is a unit of
A)time.
B)energy.
C)distance.
D)mass.
Q20: The diurnal rotation of the stars refers
Q21: Which star will emit the shortest wavelength
Q22: The temperature of a star is evidenced
Q23: The event that changes a protostar to
Q24: Luminosity is
A)the total amount of light energy
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