Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 7, Problem 25Q
To determine
The evidence that impact craters are actually caused by impacts.
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Students have asked these similar questions
The iron meteorite that created Barringer Crater (Arizona) was 50 m in diameter. It caused a crater 1.2 km (1200 m) in diameter, that is, 24 times bigger than the impactor. Keeping in mind that the size of the crater depends on many factors, such as the type of rocks present in the area, estimate the approximate size of the impactor that produced Mare Serenitatis.
Which of the following is least reasonable regarding impact craters?
Group of answer choices
The size and shape of the crater and the amount of material excavated depends on factors such as the velocity and mass of the impacting body and the geology of the surface.
Craters are most often are circular but more elongate craters can be produced with impactors striking the surface at very low angles.
The Moon has more craters than the Earth because of its strong tidal force on the impactors.
Objects from space typically hit Earth at about 20 km/s ande produce craters that can be approximately 20 times larger in diameter than the impacting objects.
The faster the incoming impactor, the larger the crater.
A crater on the Moon is 28 km in diameter. If a
typical meteorite is 11 times smaller than the
diameter of the crater, what was the diameter (in
km) of the original meteorite?
km
What is the estimated depth (in km) of the crater if
its depth is one-ninth its diameter?
km
Chapter 7 Solutions
Universe: Stars And Galaxies
Ch. 7 - Prob. 1QCh. 7 - Prob. 2QCh. 7 - Prob. 3QCh. 7 - Prob. 4QCh. 7 - Prob. 5QCh. 7 - Prob. 6QCh. 7 - Prob. 7QCh. 7 - Prob. 8QCh. 7 - Prob. 9QCh. 7 - Prob. 10Q
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- Why did it take so long for geologists to recognize that the lunar craters had an impact origin rather than a volcanic one?arrow_forwardWhat methods do scientists use to distinguish a meteorite from terrestrial material?arrow_forwardWhy do planetary scientists hypothesize that the Moon formed with a molten surface?arrow_forward
- We believe that chains of comet fragments like Comet Shoemaker-Levy 9’s have collided not only with the jovian planets, but occasionally with their moons. What sort of features would you look for on the outer planet moons to find evidence of such collisions? (As an extra bonus, can you find any images of such features on a moon like Callisto? You can use an online site of planetary images, such as the Planetary Photojournal, at photojournal.jpl.nasa.gov.)arrow_forwardWhat is the difference between a meteor and a meteorite?arrow_forwardExplain the role of impacts in planetary evolution, including both giant impacts and more modest ones.arrow_forward
- Why do astronomers conclude that the surface of Mercury, shown here, is old? When did the majority of those craters form?arrow_forwardWhat evidence can you cite that the Moon had volcanism? Does the Moon have volcanism today? How do you know?arrow_forwardIf all life were destroyed on Earth by a large impact, would new life eventually form to take its place? Explain how conditions would have to change for life to start again on our planet.arrow_forward
- Which of the following events can NOT be explained by a giant impact event? The large metallic core of Mercury The extreme axis tilt of Uranus The formation of the Moon The backwards rotation of Venusarrow_forwardWhat is impact parameter?arrow_forwardA lot of asteroid and comet dust collides with Earth's atmosphere everyday. Assume that 500 tons of mass is added to Earth daily from the millions of meteors that enter our atmosphere. Estimate the time it would take for the Earth's mass to increase 0.2% with this impact rate. Is this mass accumulation significant to Earth as a planet.arrow_forward
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