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.   a year in sidereal time.
B.   the distance light travels in 1 year.
C.   105 AU (astronomical units)
D.   the diameter of our solar system.
Question #2
Motion of light at the constant speed of light tells us:
A.   Light causes many optical illusions.
B.   Light moves instantly from all objects to Earth.
C.   We see distant objects as they were long ago. 
D.   Different colors of light travel at different constant speeds.
Question #3
Patterns of stars in the sky, clusters, and constellations, help us to identify:
A.   star groups are stars close together
B.   our astrological future
C.   Greek legends
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.   making an educated guess
B.   expressing the results as a "law" or "principle"
C.   collecting data
D.   a careful analysis of data
E.   comparing results with expectations

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