The ancient Greeks, including Ptolemy, thought that the stars were
A) scattered everywhere between the moon and the inside surface of a large sphere that enclosed the universe.
B) scattered throughout infinite space.
C) alive.
D) scattered everywhere between Earth and the moon.
E) fixed to the inside surface of a large sphere that enclosed the universe.
E
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Which part of the electromagnetic spectrum generally gives us our best views of stars forming in dusty clouds?
A) infrared B) visible light C) ultraviolet D) blue light
A uniform solid sphere has a moment of inertia I about an axis tangent to its surface. What is the moment of inertia of this sphere about an axis through its center?
A) 1/7 I B) 2/7 I C) 2/5 I D) 3/5 I E) 7/5 I
The heavier elements on Earth (those with atomic numbers greater than 5):
were in existence at the moment of the big bang. were formed immediately after the big bang. are formed by stellar nucleosynthesis during the life cycles of existing stars. are constantly being created by fusion in our Sun and blown here by the solar wind. All of the above are true statements.
A helium balloon rises because of __________ principle
Fill in the blank(s) with correct word