How does the Milky Way compare to other spiral galaxies in size?
What will be an ideal response?
The Milky Way is a large spiral. It is larger and more luminous than most spirals, but there are spiral galaxies that are significantly larger.
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The Pliocene is a(n)
a. epoch. b. era. c. eon. d. period.
What two observable properties of a Cepheid variable are directly related to one another?
A) the period between its peaks of brightness and its luminosity B) the period between its peaks of brightness and its distance C) its luminosity and its mass D) its mass and its distance
An object is placed 27.0 cm to the left of a lens of focal length 17.0 cm. 39.0 cm to the right of this lens is a plane mirror. Where does the final image form?
a. 6.9 cm to the right of the mirror b. 6.9 cm to the left of the mirror c. 32.1 cm to the left of the lens d. 45.9 cm to the left of the lens e. 28.6 cm to the left of the mirror
It is more difficult to determine the total amount of dark matter in an elliptical galaxy than in a spiral galaxy. Why?
A) Elliptical galaxies lack the atomic hydrogen gas that we use to determine orbital speeds at great distances from the centers of spiral galaxies. B) Elliptical galaxies contain much less dark matter than spiral galaxies, so it's much more difficult to measure. C) Stars in elliptical galaxies are dimmer, making them harder to study. D) cannot observe spectral lines for elliptical galaxies.