# Understanding Our Universe

## Stacy Palen, Laura Kay

Language: English

Pages: 560

ISBN: 0393912108

Format: PDF / Kindle (mobi) / ePub

Innovative pedagogy and unique application exercises teach students to apply what they've learned, as they learn it.

Understanding Our Universe was constructed with the latest astronomy education research in mind: students learn by doing. The learning system allows students to immediately apply what they learn, gain a deeper understanding of the science, build confidence, and make meaningful connections to their everyday lives.

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E. all the features we can see are the same age. 18. Geologists can find the actual age of features on a world by a. radioactive dating of rocks retrieved from the world. b. comparing cratering rates on one world to those on another. c. assuming that all features on a planetary surface are the same age. d. both a and b e. both b and c 19. Impacts on the terrestrial worlds a. are more common than they used to be. b. have occurred at approximately the same rate since the formation of.

Working It Out  2.1  Manipulating Equations So far, we have discussed scientific notation and units. Now we want to relate quantities to each other, such as distance and time. In Section 2.1, we mentioned the speed of the surface of Earth as it rotates. How do we know that speed? How are distance, time, and speed related? If you travel a distance of 100 kilometers, and it takes you a time of 1 hour, you have traveled at a speed of 100 kilometers per hour. That’s how we say it in English. How do.

Period is in Earth years, which can be determined by careful observation of Neptune’s position relative to the fixed stars. Neptune’s period is 165 years. Plugging this into Kepler’s third law, we find that (Pyears)2 = (AAU)3 (165)2 = (AAU)3 To solve this equation, we must first square the left side to get 27,225 and then take its cube root. Calculator hint: A scientific calculator usually has a cube root function. It sometimes looks like x1/y and sometimes like x √y. You use it by typing the.

Force is inversely The force proportional is inversely proportional to the square of to thethe distance square of the distance between the masses. between Larger the masses. Larger distances produce distances smallerproduce forces. smaller forces. F m2 F 62 C HAPTE R 3  Laws of Motion |  3.5 Orbits Are One Body “Falling Around” Another Kepler’s laws regarding the motions of planets allowed astronomers to predict the positions of the planets accurately, but these laws did not explain why.

Redder than if the source were not moving away from you, so it is redshifted, as seen in Figure 5.20c. The faster the object is moving with respect to you, the larger the shift. The amount by which the wavelength of light is shifted by the Doppler effect is called the Doppler shift of the light, and it depends on the speed of the object emitting the light. The Doppler shift provides information only about the radial velocity of the object: the part of the motion that is toward you or away from.