The helium flash is the cause of some supernovae
a. True
b. False
Indicate whether the statement is true or false
False
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Which event marks the birth of a star?
A) Formation of the planetary nebula B) Fusion of hydrogen atoms into helium atoms C) Collapse of an interstellar cloud D) Formation of a photosphere E) Instability in an interstellar cloud
That light can undergo interference is evidence that it:
a. has a phase of 180°. c. behaves like a wave. b. has electric properties. d. is made of corpuscles.
Estimation: Estimate how many pennies would you have to stack to reach from the floor to an average 8-ft ceiling.
A. 2 × 103 B. 2 × 102 C. 2 × 104 D. 2 × 105 E. 2 × 106
The diagram below illustrates a portion of the model for the universe described by
a.
Kepler.
b.
Tycho.
c.
Ptolemy.
d.
Copernicus.
e.
Galileo.