What physical feature of our planet is most dependent on supernova events?
a. oceans of water
b. a breathable atmosphere
c. organic chemicals
d. uranium in Earth's interior
e. a nickel-iron core
e
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Sunspots are dark because
a. regions of the photosphere are obscured by material in the chromosphere. b. shock waves move through the photosphere. c. the sun rotates differentially. d. the strong magnetic field inhibits the currents of hot gas rising from below. e. they radiate their energy into space faster than the rest of the photosphere.
The Big Bang predicts that the universe should be 25 percent hydrogen and 75 percent helium
Indicate whether the statement is true or false
A baseball is moving in the air along the customary parabola. Ignoring air drag, where is the force on the baseball zero?
a. at the top of the parabola b. just when it has started upward c. where it is about to impact d. nowhere
A meteoroid, meteor, and meteorite could come from the same celestial body
a. True b. False Indicate whether the statement is true or false