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Question
Prior to the formation of the protostar, ________.A) the interstellar clouds are composed of equal amounts of hydrogen and helium
B) the temperature of the cloud is greater than 10,000 K
C) nuclear fusion converts hydrogen to helium
D) nuclear fusion does not occur
Answer
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Related questions
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What is the main factor that determines what will happen to a star after it consumes all of its nuclear fuel?
A) temperature
B) size
C) mass
D) velocity
E) composition
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A neutron star theoretically will form from a supernovae collapse that ________.
A) fuses all of the atoms into super atoms with very high atomic numbers
B) compresses all atoms so that electrons are so close to the nucleus that all of the protons are converted to neutrons
C) forms ions that bond electrostatically into very small volumes
D) converts the atomic nucleus to a small volume with high mass by expelling all neutrons
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Balance for a main sequence star is achieved when ________.
A) nuclear fusion and fission occur at the same rate
B) gas pressure matches temperature
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E) all of the above
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The Sun belongs to this class of stars.
A) black hole
B) main-sequence star
C) red giant
D) white dwarf
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A red star is ________ our Sun.
A) hotter and smaller than
B) hotter and larger than
C) colder and larger than
D) colder and smaller than
E) approximately the same temperature and size as
Q:
When viewed through an optical telescope, planetary nebula ________.
A) look like giant planets such as Jupiter
B) have visible planets within their cloud of debris
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Q:
What was Hubble's major contribution to Cosmology?
A) He identified Cepheid Variable stars.
B) He measured the size of the universe.
C) He identified numerous new galaxies outside the Milky Way.
D) He developed a new method for measuring the absolute magnitude of stars.
E) He proved the Big Bang Theory.
Q:
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Q:
Label the Giant and Supergiant stars, the Main Sequence stars, and the White dwarf stars on the H-R diagram below.
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Which fate of the universe is currently favored: Big Crunch or Big Chill?
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Has the Big Bang hypothesis been successfully tested?
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Very large red stars, such as Betelgeuse in the constellation Orion, are called ________.
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Possibly the most cataclysmic event associated with the death of a star is the ________.
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The hottest main-sequence stars are also the most massive.
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The measure of a star's brightness is called its magnitude.
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Examine the words and/or phrases for each question below and determine the
relationship among the majority of words/phrases. Choose the option which does not fit the pattern. magnitude
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temperature
composition
Q:
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The Sun produces energy by converting ________ to energy.
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The Sun is composed almost entirely of two gases. They are ________ and ________.
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Streams of protons and electrons emitted from the Sun are known as the ________.
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In some instances, light behaves like waves, and in others, like discrete particles.
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Examine the words and/or phrases for each question below and determine the
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photosphere
chromosphere
sunspots
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Thunderstorms are usually associated with nimbostratus clouds.
Q:
Divergence aloft helps maintain surface lows.