21ST CENT.AST.W/WKBK+SMARTWORK >BI<
6th Edition
ISBN: 9780393415216
Author: Kay
Publisher: NORTON
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Chapter 8, Problem 12QP
To determine
The reason for scientists propose an early period of heavy bombardment in the solar system.
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Chondrites are meteorites that have
a.
never been heated.
b.
been heated sufficiently to release volatiles they contained.
c.
been heated sufficiently to melt the chondrules.
d.
been completely melted.
e.
entered Earth’s atmosphere but will be destroyed before reaching the ground.
5) What is the ratio of the number of asteroid impacts on the moon to the number of impacts
on Earth? Assume the asteroids are originally traveling 15 km/s and use the following data.
Mass: 5.97x1024 kg Earth, 7.3x1022 kg moon
Radius: 6372 km Earth, 1738 km moon
Note we count the number of craters on the moon to infer the number of impacts on Earth
because many Earth craters have been hidden by erosion.
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Chapter 8 Solutions
21ST CENT.AST.W/WKBK+SMARTWORK >BI<
Ch. 8.1 - Prob. 8.1CYUCh. 8.2 - Prob. 8.2CYUCh. 8.3 - Prob. 8.3ACYUCh. 8.3 - Prob. 8.3BCYUCh. 8.4 - Prob. 8.4CYUCh. 8.5 - Prob. 8.5CYUCh. 8.6 - Prob. 8.6CYUCh. 8 - Prob. 1QPCh. 8 - Prob. 2QPCh. 8 - Prob. 3QP
Ch. 8 - Prob. 4QPCh. 8 - Prob. 5QPCh. 8 - Prob. 6QPCh. 8 - Prob. 7QPCh. 8 - Prob. 8QPCh. 8 - Prob. 9QPCh. 8 - Prob. 10QPCh. 8 - Prob. 11QPCh. 8 - Prob. 12QPCh. 8 - Prob. 13QPCh. 8 - Prob. 14QPCh. 8 - Prob. 15QPCh. 8 - Prob. 16QPCh. 8 - Prob. 17QPCh. 8 - Prob. 18QPCh. 8 - Prob. 19QPCh. 8 - Prob. 20QPCh. 8 - Prob. 21QPCh. 8 - Prob. 22QPCh. 8 - Prob. 23QPCh. 8 - Prob. 24QPCh. 8 - Prob. 25QPCh. 8 - Prob. 26QPCh. 8 - Prob. 27QPCh. 8 - Prob. 28QPCh. 8 - Prob. 29QPCh. 8 - Prob. 30QPCh. 8 - Prob. 31QPCh. 8 - Prob. 32QPCh. 8 - Prob. 33QPCh. 8 - Prob. 34QPCh. 8 - Prob. 35QPCh. 8 - Prob. 36QPCh. 8 - Prob. 37QPCh. 8 - Prob. 38QPCh. 8 - Prob. 39QPCh. 8 - Prob. 40QPCh. 8 - Prob. 41QPCh. 8 - Prob. 42QPCh. 8 - Prob. 43QPCh. 8 - Prob. 44QPCh. 8 - Prob. 45QP
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- Imagine that you visit a planet orbiting another star and discover that it is heavily cratered, but its small moon is nearly crater free. Why would that be a surprise? Speculate about what might have happened to those objects.arrow_forwardQuestion: The current and most scientifically accurate theory for the formation of the Moon is: a.) The large impact theory. b.) The capture theory. c.) The fission theory. d.) The twin formation theory.arrow_forwardHow many impacts would you expect to strike a 100m2 region in one hour during Earth’s formation, assuming that Earth grew to its present size in 10 million years from particles averaging 100 grams each? (Hint: Assume that Earth had its current radius of 6378km.) (Notes: The surface area of a sphere is 4pir2 ; 1yr=3.2x107 .) a. About 1300. b. About 13 . c. About 13,000. d. About 130arrow_forward
- Some planets have very strong magnetic fields. What features must a planet have to cause this? a.both rapid rotation and a conducting liquid core b.only a rapid rotation c.only a liquid conducting core d.both a rapid rotation and a solid metallic core e.only a metallic corearrow_forwardAlthough Deimos is smaller than Phobos, Deimos has more debris on its surface. This difference in the two moons is probably the result of a. the greater number of impact craters on Deimos. b. Martian gravity, which is strong enough to pull debris off the surface of Phobos. c. the lack of volcanic activity on the surface of Phobos. d. the comparatively weaker gravity on Deimos. e. the slower rotation rate of Deimos on its axis.arrow_forwardBased on the physical aspects of Catena Mendeleev, what is the most plausible explanation for how crater chains are formed on the Moon? a. these craters chains are formed by a series of impacts from a passing comet or asteroid that just passed to close too the Moon and ended up colliding with the Moon b. they are the result of surface collapse due to the prescence of an underground fault c. they are primarily the result of secondary fragments hitting the lunar surface from an initially from an larger impact fragment that resulted in another larger, distant craterarrow_forward
- 1. Which of the outer planets have compositions dominated by the "ices" ingredient? Check the correct two. 2. Which of the outer planets have compositions dominated by the "gases" ingredient? Check the correct two. 3. Most of the spaceflight missions to the outer planets have been flyby missions, but two of them were orbiters. Which of these two spacecraft orbited giant planets? Check the correct two. (Hint: An orbiter might do a flyby of one planet and then go on to orbit a different planet.) 4. Jupiter's mass is how many times larger than the Earth's? Just type a number, no words or any other extra stuff. 5. Which of the outer planets has extreme seasons, with its rotational axis being tilted so much that it is practically in the plane of its orbit?arrow_forwardWhich of the following statements is correct? a. The formation of planets stopped because the solar nebula got cooler c. The formation of planets stopped because the solar nebula ran out of planetesimals d. The formation of planets stopped because the solar nebula spinning was slowing down e. The formation of planets stopped because the young Sun's strong solar wind swept away material not yet accreted onto the planetsarrow_forwardHellas Planitia includes the word "planitia" which is the latin word for "plain" in its name. The name would seem to indicate thats Hellas Planitia is a low lying plain, yet it is clearly a crater, and a very large one at that. The most probable reason for this discrepancy in its name is because: a. It is a simple naming error that for some reason has so far escaped correction. b. There is a disagreement among astronomers about the true nature of Hellas Planitia. c. Its true nature was not apparent over 100 years ago when it was observed using ground based telescopes. d. Astronomers really know its true nature and misconceptions among the public among the public are not of great concern to them.arrow_forward
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