What is the major difference between an elliptical galaxy and a spiral galaxy?
A) A spiral galaxy contains mostly younger stars.
B) A spiral galaxy has a spherical halo.
C) An elliptical galaxy lacks a disk component.
D) Elliptical galaxies are not as big as spiral galaxies.
E) There are no dwarf spiral galaxies, but there are dwarf ellipticals.
C
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Earth never passed through the cratering stage in planetary development
a. True b. False Indicate whether the statement is true or false
The distance to a hypothetical galaxy is estimated at about 7 × 10^6 light years. A light year is the distance traveled by light in one year; if the speed of light is 3 × 10^8 m/s, about how far is it from our galaxy to this hypothetical galaxy? (1 year = 3.15 × 10^7 s)
a. 7E+21 m b. 1E+9 m c. 7E+22 m d. 7E+5 m
An unbalanced force of 42 N is applied to a mass of 7.0 kg. What will be the resulting acceleration?
By the early part of the 20th century, theoretical physics had changed dramatically because of so many new results. The work of Franck and Hertz showed that the atomic levels were quantized. Why did that work specifically make so much of an impact at that time?