The Solar System

CHAPTER 25 | METEORITES, ASTEROIDS, AND COMETS 573 SCIENTIFIC ARGUMENT How do comets help explain the formation of the planets? ...

574 PART 4^ |^ THE SOLAR SYSTEM Barringer Crater Barringer Crater near Flagstaff , Arizona, is 1.2 km ( 3 __ 4 of a mile) in dia ...

CHAPTER 25 | METEORITES, ASTEROIDS, AND COMETS 575 asteroid about 30 m in diameter, perhaps one-tenth the mass of the Barringer ...

576 PART 4^ |^ THE SOLAR SYSTEM near limestone deposits, large amounts of carbon dioxide could be released into the atmosphere a ...

CHAPTER 25 | METEORITES, ASTEROIDS, AND COMETS 577 and astronomical time scales. For exam- ple, astronomers estimate an Apollo o ...

578 PART 4^ |^ THE SOLAR SYSTEM one big impact. Astronomers point out that the biggest objects are so rare they can be ignored. ...

CHAPTER 25 | METEORITES, ASTEROIDS, AND COMETS 579 ▶ Most asteroids lie in a belt between Mars and Jupiter. Kirkwood gaps (p. 56 ...

580 PART 4^ |^ THE SOLAR SYSTEM Learning to Look What do you see in the image to the right that tells you the size of plan- ete ...

581 Guidepost This chapter is either unnecessary or vital. If you believe that astronomy is the study of the physical universe a ...

582 PART 5^ |^ LIFE defi nition of what living things do, distinguishing them from nonliving things, might be: Life is a process ...

CHAPTER 26 | ASTROBIOLOGY: LIFE ON OTHER WORLDS 583 the rungs, providing instructions to guide specifi c chemical reactions with ...

584 PART 5^ |^ LIFE The traits you inherit from your parents, the chemical processes that animate you, and the structure of your ...

CHAPTER 26 | ASTROBIOLOGY: LIFE ON OTHER WORLDS 585 As a cell begins to divide, its DNA duplicates itself. The duplicated chromo ...

586 PART 5^ |^ LIFE Life in the Universe Life as we know it consists of just the single example of life on Earth. It is OK to th ...

CHAPTER 26 | ASTROBIOLOGY: LIFE ON OTHER WORLDS 587 you can imagine there probably were earlier, simpler organisms. Where did th ...

588 PART 5^ |^ LIFE Th e Miller experiment is important because it shows that complex organic molecules form naturally in a wide ...

CHAPTER 26 | ASTROBIOLOGY: LIFE ON OTHER WORLDS 589 it is for complex organic molecules to form naturally from sim- pler compoun ...

590 PART 5^ |^ LIFE If you watched closely, you might see the fi rst humanoid forms by late afternoon on New Year’s Eve, and by ...

CHAPTER 26 | ASTROBIOLOGY: LIFE ON OTHER WORLDS 591 environment is called an extremophile. Maybe you have friends like that. Lin ...

592 PART 5^ |^ LIFE liquid as the medium in which the processes of life can occur. Water is a cosmically abundant substance with ...