How did conditions differ from the present era when the universe was young?
A.) The young Universe was colder, less dense, and smoother.
B.) The young Universe was hotter, less dense, and smoother.
C.) The young Universe was colder, less dense, and bumpier.
D.) The young Universe was hotter, more dense, and smoother.
E.) The young Universe was colder, more dense, and bumpier.
Answer: D.) The young Universe was hotter, more dense, and smoother.
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What causes some asteroids leave the asteroid belt and sometimes approach Earth?
A. Because Earth's gravitational field attracts them. B. Because Jupiter's gravitational field ejects them. C. Because they crash into one another and get ejected.
An eclipse season is the period of time during which the
a. Moon crosses a node in its orbit. b. Sun crosses a node in the Moon's orbit. c. line of nodes crosses the Moon's orbit. d. Moon is new or full. e. Moon is visible during the day.
The visible parts of galaxies contribute about one-tenth of the critical density of the universe
Indicate whether the statement is true or false
If a negatively charged rod is brought close to (but not touching) an initially neutral object, the object becomes polarized and has ________ charge.
Fill in the blank(s) with the appropriate word(s).