Which of the following statements is generally true for stars in the halo?
A) Halo stars all orbit the center of the galaxy in approximately the same plane.
B) Halo stars always remain in the halo, never passing through the disk of the galaxy.
C) All halo stars will end their main-sequence lives within the next 100 million years.
D) Halo stars have a much smaller proportion of elements besides hydrogen and helium than our Sun.
E) Halo stars come in a wide variety of ages.
D) Halo stars have a much smaller proportion of elements besides hydrogen and helium than our Sun.
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Which statement accurately describes how observations of distant galaxies help us learn about galaxy evolution?
A) By observing galaxies with different lookback times, we learn how galaxies appeared at different stages of their evolution. B) We can observe the birth of galaxies. C) We can observe the evolution of a single galaxy over time. D) We can watch as two galaxies merge and view the result, helping us learn how mergers affect evolution. E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.
The larger a turkey cooked in a conventional oven at a given temperature, the
A) more time per pound is needed. B) less time per pound is needed. C) the same time per pound is needed.
All jovians have at least eight moons and equatorial rings
Indicate whether the statement is true or false
Which of these (hypothetical) modifications would cause lunar eclipses to happen once per month?
A) Change the Moon's orbital plane so it tilts the opposite way. B) Change the orbital plane of the Moon so it lies in the same plane as Earth's orbit around the Sun. C) Relocate the Moon to twice its current distance from the Earth. D) Make the Moon orbit the Earth twice as fast.