SMT 314 - Introduction to Cosmology » Fall 2020 » HW1

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Question #1
Light from our nearest star, the Sun, takes 8 minutes to reach us. The next closest star, Proxima Centauri, is 4.4 light years away. What is a light year?
A.   the diameter of our solar system.
B.   a year in sidereal time.
C.   105 AU (astronomical units)
D.   the distance light travels in 1 year.
Question #2
Motion of light at the constant speed of light tells us:
A.   We see distant objects as they were long ago. 
B.   Light moves instantly from all objects to Earth.
C.   Different colors of light travel at different constant speeds.
D.   Light causes many optical illusions.
Question #3
Patterns of stars in the sky, clusters, and constellations, help us to identify:
A.   Greek legends
B.   star groups are stars close together
C.   our astrological future
D.   north, and seasons; as Earth rotates
Question #4
When we observe very distant stars and galaxies, we see them as they are at the present time (or nearly the present time), since light travels at the maximum speed possible.
A.   TRUE
B.   FALSE
Question #5
Which is NOT a necessary part of the Scientific Method of Inquiry?
A.   a careful analysis of data
B.   expressing the results as a "law" or "principle"
C.   collecting data
D.   comparing results with expectations
E.   making an educated guess

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