What percentage of the solar nebula's mass consisted of rocky material?
answer
0.4 percent
question
What was the frost line of the solar system?
answer
the distance from the Sun where temperatures were low enough for hydrogen compounds
to condense into ices, between the present-day orbits of Mars and Jupiter
question
Which of the following is the origin of almost all the large moons around the jovian planets?
answer
They were formed by condensation and accretion in a disk of gas around the planet.
question
Observations of young stars (as well as theory) tell us that when the Sun was young the solar wind ?
answer
was stronger than it is today.
question
At first, the Sun's present-day rotation seems to contradict the prediction of the nebular theory because ?
answer
the theory predicts that the Sun should have been rotating fast when it formed, but the actual rotation is fairly slow.
question
Which of the following are relatively unchanged fragments from the early period of planet building in the solar system?
answer
Oort cloud comets,asteroids ,Kuiper belt comets,the moons of Mars/ all of the above
question
According to the nebular theory, how did the Kuiper belt form?
answer
it is made of planetesimals that formed beyond Neptune's orbit and never accreted to form a planet.
question
Based on our current theory of Earth's formation, the water we drink comes from ?
answer
comets that impacted Earth.
question
Which of the following is not evidence supporting the giant impact theory for the formation of the Moon?
answer
Scientists have found several meteorites that appear to be the remains of the object that caused the giant impact
question
The nebular theory of the formation of the solar system successfully predicts all but one of the following. Which one does the theory not predict?
answer
the equal number of terrestrial and jovian planets
question
The age of the solar system can be established by radioactive dating of?
answer
the oldest meteorites.
question
Suppose you find a rock that contains some potassium-40 (half-life of 1.3 billion years). You measure the amount and determine that there are 5 grams of potassium-40 in the rock. By measuring the amount of its decay product (argon-40) present in the rock, you realize that there must have been 40 grams of potassium-40 when the rock solidified. How old is the rock?
answer
3.9 billion years
question
All the planets in the solar system rotate in the same direction as they orbit the Sun?
answer
False
question
The more massive planets in the solar system tend to be less dense than the lower mass planets?
answer
True
question
Impacts were extremely common in the young solar system but no longer occur today?
answer
False
question
The Moon probably formed at the same time that Earth formed, rather like the formation of a double planet.?
answer
False
question
Based on our theory of how our own solar system formed, we would expect that other solar systems would be quite common?
answer
True
question
Process of Science: We cannot test the nebular theory for the formation of the Solar System in a rigorous scientific way because the Sun and planets formed in the distant past.
answer
False
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