What is the source of the energy the Sun radiates to us?
A)
chemical reactions
B)
nuclear fission reactions
C)
nuclear fusion reactions
D)
magnetic explosions
E)
cosmic rays
C
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If two stars have the same parallax, but the brighter is magnitude +2.3, and the fainter is magnitude +3.3, then the fainter star is ________ less luminous
Fill in the blank(s) with correct word
About how long does it take a spacecraft to go from Earth to Jupiter?
a. a week b. a month c. a year d. several years e. several decades
The ratio of the electric field to the magnetic field in the electromagnetic wave is the speed of the light
Indicate whether the statement is true or false
The iridium layer at the Cretaceous-Tertiary boundary is attributed to
A) meteorite bombardment. B) massive volcanic eruptions. C) massive earthquakes and shock waves. D) extinction of the dinosaurs.