The original Big Bang model had three major problems. The ‘fix’ that solved them is known as _________.
When light from a hot solid, liquid, or dense gas passes through a cooler gas, it will produce a/an _________ spectrum.
One name that has been given the mysterious force apparently responsible for driving the acceleration of the universeâ€™s expansion is _________.
The area on the H-R diagram where â€œnormalâ€ stars can be found is known as the _________.
Although Copernicus’ model of the solar system correctly placed the sun at the center, it still provided inaccurate predictions because it maintained that the planets’ orbits were _________.
A spiral galaxy like the Milky Way has three major components: the disk, the bulge, and the _________.
The more massive a white dwarf is, the (larger/smaller) _________ its diameter will be.
The strength of an objectâ€™s gravitational pull on another is determined by its _________ and the distance between them.
Comparing a yellow star, a blue star, and a red star, we could determine just from color that the hottest star was the ________ one.
Rotation curves of spiral galaxies show that starsâ€™ orbital speeds donâ€™t drop off with distance from the galactic center as expected, and thus imply the existence of __________.
The main sequence includes the following kinds of stars:
A) Hot, blue, small, massive ones and cool, red, large, low-mass ones
B) Hot, blue, large, massive ones and cool, red, small, low-mass ones
C) Hot, red, small, massive ones and cool, blue, large, low-mass ones
D) Hot, red, large, massive ones and cool, blue, small, low-mass ones
Which of the following was not an era in the history of the universe?
The phases of the moon are caused by
A) The change of the moonâ€™s distance to Earth during its orbit.
B) The different face the moon turns toward Earth during its orbit.
C) The alignment of the Earth/moon/sun system casting shadows on the moonâ€™s surface.
D) The alignment of the Earth/moon/sun system making a different portion of the moonâ€™s daylight side visible to Earth.
Spectra help us determine the composition of astronomical objects because
A) Each element, compound, or ion has a different set of spectral lines.
B) Each element, compound, or ion has a different peak wavelength.
C) Each element, compound, or ion has a different redshift.
D) Each element, compound, or ion has a different brightness.
Dark energy is the most important factor in the _________ universe scenario for the fate of the universe.
The outer planets are more massive than the inner planets because
A) There were ices as well as rock and metal from which they could form.
B) They gained mass fast enough to capture gas from the solar nebula.
C) Both of the above
D) Neither of the above
The three basic types of galaxies are
A) Spiral, elliptical, and dwarf.
B) Spiral, elliptical, and irregular.
C) Spiral, giant, and irregular.
D) Spiral, giant, and dwarf.
A planet orbiting a star feels a force due to the starâ€™s gravity that
A) Increases with the square of the starâ€™s mass and decreases with the distance.
B) Decreases with the square of the starâ€™s mass and increases with the distance.
C) Increases with the starâ€™s mass and decreases with the square of the distance.
D) Decreases with the starâ€™s mass and increases with the square of the distance.
Massive main sequence stars
A) Have hot cores, use their hydrogen rapidly, and go supernova after a short life.
B) Have hot cores, use their hydrogen slowly, and go supernova after a long life.
C) Have cooler cores, use their hydrogen rapidly, and eject their outer layers as planetary nebulae after a short life.
D) Have cooler cores, use their hydrogen slowly, and eject their outer layers as planetary nebulae after a long life.
Hubbleâ€™s law gives us an indirect way to measure a galaxyâ€™s
We can determine an objectâ€™s temperature from its thermal (or â€œblackbodyâ€) spectrum by finding the wavelength at which it emits the most electromagnetic radiation.
A solar eclipse occurs during full moon.
We can still see radiation left over from the Big Bang today as the cosmic microwave background.
After its core hydrogen is depleted, a red main sequence star will go supernova after its red giant phase.
The oldest stars in the Milky Way are found in the disk.
Astronomers believe there is enough dark matter in the universe to slow its expansion gradually toward a stop.
Galileoâ€™s findings from his telescopic observations were revolutionary because he showed that the heavens were not perfect.
If the sun had begun fusion later, so it did not clear the solar nebula of its remaining gas so soon, Uranus and Neptune might have become as large as Jupiter and Saturn are now.
If the sun somehow instantaneously became a 1 solar mass black hole, the Earth would soon spiral into it as part of an accretion disk.
According to Hubbleâ€™s law, the redshift of a distant galaxy is directly related to its temperature.