Stars on the upper left of the H-R diagram are longer lived than those on the lower right
Indicate whether the statement is true or false
FALSE
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Imagine another solar system, with a star more massive than the Sun. Suppose a planet with the same mass as Earth orbits at a distance of 1 AU from the star. How would the planet's year (orbital period) compare to Earth's year?
A) The planet's year would be shorter than Earth's. B) The planet's year would be longer than Earth's. C) The planet's year would be the same as Earth's. D) An orbit at a distance of 1 AU would not be possible around a star more massive than the Sun.
A star with a right ascension of 1.0 hours will rise
A) 1.0 hours before the vernal equinox. B) 1.0 hours after the vernal equinox. C) at the same time as the vernal equinox. D) 13.0 hours before the vernal equinox. E) 11.0 hours after the vernal equinox.
Binary star systems are thought to form when
A) gravity pulls two neighboring protostars quite close together, but angular momentum causes them to orbit each other rather than collide. B) two interstellar gas clouds happen to contract so close together that there's no room for a disk or planets. C) the protostellar disk around a protostar has enough material to form a second star. D) a protostar emits two jets, each of which turns into a star.
All of the following have occurred over long periods of time on Earth. Which one is not thought to have played a major role in long-term changes in Earth's climate?
A) changes in the Earth's axis tilt B) changes in the Earth's overall reflectivity C) a gradual rise in the atmospheric content of oxygen D) changes in the atmospheric concentration of greenhouse gases