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Which planet by itself contains the majority of mass of all the planets?
E) the Earth
A loop of gas following the magnetic field lines between sunspots' poles is
A) a prominence.
B) a coronal hole.
C) a flare.
D) a ray.
E) a coronal mass ejection
Density is defined as
A) weight divided by the planet's radius.
B) size divided by weight.
C) weight per square inch.
D) mass times weight.
E) mass per unit volume.
mass per unit volume.
The temperature of the photosphere is about
A) 11,000 K.
B) 5,800 K.
C) one million K.
D) 3,200 K.
E) ten million K.
How long does the sunspot cycle last, on average?
A) about 11 years
B) between 25 and 35 days
C) 365.25 days
D) about 76 years
E) about seven year
about 11 years
When strong solar winds are displaced poleward by our magnetic fields, we get
A) hurricanes in the tropics.
B) intense auroral displays.
D) droughts and dust bowls in the American West.
E) the Van Allen radiation belts.
intense auroral displays.
Which of these are not associated with the active Sun?
Iron meteorites are believed to come from
A) a broken up cometary nucleus.
B) debris from the Kuiper Belt.
C) interstellar space.
D) the crust of a differentiated asteroid, now broken up.
E) the core of a differentiated asteroid, now broken up
the core of a differentiated asteroid, now broken up
In terms of composition
A) the jovian planets are made only of ice, and the terrestrials only of rock.
B) the terrestrials are more like the Sun, since they formed close to it.
C) all planets condensed from the same nebula, and have similar compositions.
D) the jovian planets are more like the Sun than are the terrestrials.
E) the Sun is unique, made of nothing but hydrogen and helium.
the jovian planets are more like the Sun than are the terrestrials.
What two energy transport mechanisms, in order from outside the core to the surface, are found in the Sun?
A) radiation, conduction
B) conduction, convection
C) radiation, convection
D) convection, conduction
E) conduction, radiation
The primary source of the Sun's energy is
A) dark energy.
B) gravitational collapse of the helium towards the core.
C) the weak force creating energy from uranium decay.
D) the strong force fusing hydrogen into helium.
E) oxidation of carbon in the core
the strong force fusing hydrogen into helium.
According to the Solar Nebula theory, planets
A) should be extremely rare.
B) should be randomly oriented to their star's equator.
C) should be a common result of star formation.
D) will revolve opposite the star's rotation.
E) should orbit perpendicular to their star's equator.
should be a common result of star formation.
The critical temperature to initiate the proton-proton cycle in the cores of stars is
A) 2,300,000 K.
B) 5,800 K.
C) 100 million K.
D) 3,000 K.
E) 10 million K.
10 million K.
Meteor showers are
A) usually annual events, as the orbits again intersect.
B) caused by the Earth passing near the orbit of an Earthgrazing asteroid.
C) caused by the Earth passing near the orbit of an old short-period comet.
D) Both A and B are correct.
E) Both A and C are correct.
Both A and C are correct.
As a rotating gas cloud contracts, it spins faster.
In the proton-proton chain, helium atoms are fused into hydrogen.
The thickness of the photosphere is about 100 times the diameter of the Earth, and large sunspots are larger than our whole planet
Sunspots usually come in pairs of north and south magnetic poles.
The granules in the photosphere are about as big as Texas, or around 1,000 km across.
All the planets orbit the Sun in exactly the same plane as the Earth.
Many astronomers now regard Pluto as just one of the largest of the thousands of Kuiper Belt bodies found beyond Neptune
Due to their great masses, all four jovian worlds are much denser than the Earth.
The key ingredient in planetary formation in the solar nebula is ________.
interstellar dust, or dust grains