Light from the Andromeda Galaxy that is just reaching us first left Andromeda when
A) the woolly mammoth last walked the Earth.
B) humans began exploring the skies with telescopes.
C) Homo erectus first walked the Earth.
D) the Solar System formed.
E) the universe began.
Correct Answer:
Verified
Q30: In the scientific method, a fact is
Q31: A theory is
A) tied to known physical
Q32: The scientific method is a process by
Q33: The statement "our universe is but one
Q34: The first event in the history of
Q36: A scientific theory can be shown to
Q37: The majority of the mass in our
Q38: A _ becomes a _ when repeated
Q39: The majority of the energy in our
Q40: How long does it take light to
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