The astronomer who originally classified galaxies into S, E, and Irr was
A) Henrietta Leavitt.
B) Carl Sagan.
C) William Herschel.
D) Harlow Shapley.
E) Edwin Hubble.
E
Physics & Space Science
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Answer the following statement true (T) or false (F)
Physics & Space Science
The two concepts that led Niels Bohr to refine the planetary model of the atom are
A. discovery of the nucleus and quantization of energy. B. properties of electrons and the hydrogen spectrum. C. discovery of the nucleus and properties of electrons.
Physics & Space Science
Tensile stress is
A) the strain per unit length. B) the same as force. C) the ratio of the change in length. D) applied force per cross-sectional area.
Physics & Space Science
If new moon fell on March 2nd, what is the Moon's phase on March 14th?
A) waning crescent B) first quarter C) full D) waxing gibbous E) waxing crescent
Physics & Space Science