The Solar System

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 473 This computer model of a mountain with the vertical scale magnified 1 ...

474 PART 4^ |^ THE SOLAR SYSTEM occur on Venus as they do on Earth, the areas north and west of Lakshmi Planum appear to be rang ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 475 The Rotation of Venus Nearly all of the planets in our solar system r ...

476 PART 4^ |^ THE SOLAR SYSTEM In comparison, Earth avoided a runaway greenhouse eff ect because it was farther from the sun an ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 477 could not see the canals at all, but others drew maps showing hundred ...

478 PART 4^ |^ THE SOLAR SYSTEM A hundred years of speculation have raised high expectations for Mars. If there were intelligent ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 479 If you could visit Mars you would fi nd it a reddish, airless, bone-d ...

480 PART 4^ |^ THE SOLAR SYSTEM as massive as a carbon dioxide molecule, and would not be lost easily. In addition, argon is ine ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 481 to the atmosphere of a medium-size world. Like its atmosphere, the ge ...

482 PART 4^ |^ THE SOLAR SYSTEM lowlands were once fi lled by an ocean of liquid water. Th is is an exciting hypothesis and will ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 483 geologically speaking, is only yesterday. Mars may still retain enoug ...

484 PART 4^ |^ THE SOLAR SYSTEM Many fl ow features lead into the northern lowlands, and the smooth terrain there has been inter ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 485 from orbit reveal features that suggest subsurface ice. Gullies leadi ...

486 PART 4^ |^ THE SOLAR SYSTEM around Mars, Spirit found the mineral goethite, which only forms in the presence of water. One a ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 487 on its surface. It is a desert world now, but someday an astronaut ma ...

488 PART 4^ |^ THE SOLAR SYSTEM huge bulge on the side of Mars (■ Figure 22-22). Some of the oldest lava fl ows on Mars are in t ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 489 The Moons of Mars If you could camp overnight on Mars, you might noti ...

490 PART 4^ |^ THE SOLAR SYSTEM discover in the next chapters that low-mass moons are typically irregular in shape, whereas more ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 491 Summary ▶ Venus is Earth’s twin in size but is slightly closer to the ...

492 PART 4^ |^ THE SOLAR SYSTEM What evidence shows that Venus has been resurfaced within the last billion years? Why doesn’t M ...