The Solar System

PERSPECTIVE: ORIGINS 185 Aging stars exhale gas and dust into the interstellar medium. The Gas-Stars-Gas Cycle Visual image Visu ...

186 PART 2^ |^ THE STARS What Are We? Children of the Milky Way Hang on tight. The sun, with Earth in its clutch, is ripping alo ...

PERSPECTIVE: ORIGINS 187 Review Questions What evidence could you cite that there is an interstellar medium? Why are protostars ...

396 The human race lives on a planet in a planetary system that appears to have formed in a nebula around the protostar that bec ...

CHAPTER 19 | THE ORIGIN OF THE SOLAR SYSTEM 397 atoms unchanged since the universe began. Evidence indicates that almost no atom ...

398 PART 4^ |^ THE SOLAR SYSTEM encounter with another star. More important, the gas pulled from the sun and the star would be m ...

CHAPTER 19 | THE ORIGIN OF THE SOLAR SYSTEM 399 which could become a planet circling the newborn sun at the center of the disk ( ...

400 PART 4^ |^ THE SOLAR SYSTEM Gaseous cloud evaporated from dust disk Visual-wavelength image Light from central star scattere ...

CHAPTER 19 | THE ORIGIN OF THE SOLAR SYSTEM 401 *Recall from Chapter 2 that the words revolve and rotate refer to diff erent typ ...

Mercury Venus Earth Mars Asteroids Earth’s moon MercuryMercury Jupiter Saturn Uranus Neptune NASANASA © UC Regents/Lick Observat ...

Moon, © UC Regents/Lick Observatory; all planets, NASA Grundy Observatory NASA Mercury is so close to the sun it is difficult to ...

404 PART 4^ |^ THE SOLAR SYSTEM (6 mi) in diameter. Th ere are probably a million or more that are larger than 1 km (0.6 mi) and ...

CHAPTER 19 | THE ORIGIN OF THE SOLAR SYSTEM 405 Technically, the word meteor refers to the streak of light in the sky. In space, ...

406 PART 4^ |^ THE SOLAR SYSTEM ■ Figure 19-6 A meteor is a sudden streak of glowing gases produced by a bit of material falling ...

CHAPTER 19 | THE ORIGIN OF THE SOLAR SYSTEM 407 surface is not geologically active like Earth’s surface, some moon rocks might h ...

408 PART 4^ |^ THE SOLAR SYSTEM Even farther from the sun there was a boundary called the ice line beyond which water vapor coul ...

CHAPTER 19 | THE ORIGIN OF THE SOLAR SYSTEM 409 Th rough these processes, the theory proposes, the nebula became fi lled with tr ...

410 PART 4^ |^ THE SOLAR SYSTEM If planets formed by accretion of planetesimals and were later melted by radioactive decay and h ...

CHAPTER 19 | THE ORIGIN OF THE SOLAR SYSTEM 411 fi nished within 10 million years but could have continued to grow for another 2 ...

412 PART 4^ |^ THE SOLAR SYSTEM to consider catastrophic events. Uranus rotates on its side. Th is might have been caused by an ...