Of all the galaxies, _____ are easiest to notice
A) elliptical galaxies
B) spiral galaxies
C) lenticular galaxies
D) dwarf spheroidal galaxies
B
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What is the quark structure of a neutron?
a. uud b. udd c. uuu d. ddd e. the question does not make sense
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object is at rest in region(s)
a.
I.
b.
II.
c.
III.
d.
no regions
If the communication lifetime of civilizations in our galaxy is 100 million years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?
A) 1 in 1,300,000 B) 1 in 13 C) 1 in 1300 D) 1 in 130
The mass of 238U is not quite an integer multiple of 1H mass. This is primarily because
a. the proton and neutron have different masses. b. there are several isotopes of uranium. c. of the binding energy of uranium. d. uranium is radioactive.