During a solar eclipse, the Moon's phase must be
A) first quarter.
B) third quarter.
C) full.
D) new.
D) new.
Physics & Space Science
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The thermal motions of the atoms in a gas cloud can make it collapse to form a protostar
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
As far as we know all forms of life on Earth use ____________ as a medium for chemical reactions
a. gaseous helium b. gaseous helium c. frozen carbon dioxide d. liquid water e. frozen water
Physics & Space Science
Before about 4 billion years ago the universe was:
A) radiation dominated. B) quark dominated. C) lepton dominated. D) matter dominated. E) dark energy dominated.
Physics & Space Science
When a nucleus in an excited state decays to the ground state, a beta particle is emitted
Indicate whether the statement is true or false
Physics & Space Science