What do the orbits of halo and disk stars tell us about the formation of the Milky Way?
What will be an ideal response?
Older halo stars move in comet-like orbits, well above the plane of the Galaxy in a spherical distribution. The disk stars formed later, after most of the remaining gas and dust had settled down into a disk, flattened by the rotation of the condensing Galaxy. Their orbits are much more like those of planets, fairly circular and in the Galactic plane.
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Tables based on a heliocentric model of the universe which used elliptical orbits for the planets were more accurate than ____________________
Fill in the blank(s) with correct word
One star is emitting mostly visible light, and another star is emitting mostly infrared light. Which star is hotter?
A) The temperature also depends on the radius of the star, so one can't decide based on the information provided. B) Both stars are the same temperature. C) The star emitting visible light. D) The star emitting infrared light.
Two balls have the same size and surface texture, but one is twice as heavy as the other. How many times larger is the terminal speed of the more massive ball falling through air than that of the lighter ball?
A. The balls fall with the same speed in air. B. The massive ball’s terminal speed is [2]1/2 times larger than the other’s. C. The massive ball’s terminal speed is 2 times larger than the other’s. D. The massive ball’s terminal speed is 4 times larger than the other’s. E. The massive ball’s terminal speed is some other multiple of the other’s (specify).
The bright blue stars of Orion's Belt are Population I, while our yellow Sun is population II
Indicate whether the statement is true or false