Nearly 100% by mass of Earth's core is composed of the two elements
a. iron and nickel
b. aluminum and silicon
c. oxygen and aluminum
d. silicon and oxygen.
b
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If the spiral density wave were the only thing producing spiral arms, it would be expected that
a. all spiral arms would be gas and dust free. b. all galaxies would have only two smooth spiral arms. c. the Milky Way would show and irregular pattern of short arms d. the Milky Way wouldn't have any spiral arms. e. the halo component of the Milky Way would show spiral arms as well.
How is it possible that orphan planets are potentially habitable, even though they do not orbit a star?
What will be an ideal response?
During an isothermal process, 5.0 J of heat is removed from an ideal gas. How much work does the gas do during this process?
A) 5.0 J B) 10 J C) -5.0 J D) 2.0 J E) 0.00 J
Mercury, the closest planet to the Sun, has an orbital period that is
1.greater than that of all of the other planets. 2.less than that of all of the other planets. 3.greater than that of some of the planets and less than that of others. 4.equal to one Earth year.