The Solar System

CHAPTER 21 | THE MOON AND MERCURY: COMPARING AIRLESS WORLDS 453 from the Imbrium impact (■ Figure 21-7), and by the Apollo 15 as ...

454 PART 4^ |^ THE SOLAR SYSTEM components while it was in space, so the moon would have formed lacking volatiles. Such an impac ...

CHAPTER 21 | THE MOON AND MERCURY: COMPARING AIRLESS WORLDS 455 Th e large-impact hypothesis is consistent with the known eviden ...

456 PART 4^ |^ THE SOLAR SYSTEM In 1962, radio astronomers detected blackbody emissions from the planet and concluded that the d ...

CHAPTER 21 | THE MOON AND MERCURY: COMPARING AIRLESS WORLDS 457 around the sun (Figure 21-12). It would require another entire o ...

458 PART 4^ |^ THE SOLAR SYSTEM may have been produced by tidal stresses generated when the sun slowed Mercury’s rotation. Th e ...

CHAPTER 21 | THE MOON AND MERCURY: COMPARING AIRLESS WORLDS 459 The Interior of Mercury One of the most striking diff erences be ...

460 PART 4^ |^ THE SOLAR SYSTEM It is also diffi cult to explain the proportionally large size of the metallic core inside Mercu ...

CHAPTER 21 | THE MOON AND MERCURY: COMPARING AIRLESS WORLDS 461 it fractured the crust and allowed lava fl ows to resurface wide ...

462 PART 4^ |^ THE SOLAR SYSTEM called the large-impact hypothesis (p. 454). The moon appears to have formed from a ring of debr ...

CHAPTER 21 | THE MOON AND MERCURY: COMPARING AIRLESS WORLDS 463 The trenches where Earth’s seafl oor slips downward are 1 km or ...

464 Guidepost You have been to the moon and to Mercury, and now you are going to fi nd Venus and Mars dramatically different fro ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 465 Th ere wasn’t a breath in that land of death... — ROBERT SERVICE, “TH ...

466 PART 4^ |^ THE SOLAR SYSTEM past or orbited Venus, and over a dozen have landed on its sur- face. Th e resulting picture of ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 467 atmosphere of Venus in 1978, it discovered that deuterium is about 15 ...

468 PART 4^ |^ THE SOLAR SYSTEM (■ Figure 22-4) that bounce the radar signal around and shoot it back the way it came. Th ese ro ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 469 Data Manipulation Why do scientists think it is OK to visually enhanc ...

470 PART 4^ |^ THE SOLAR SYSTEM Volcanism on Venus Volcanism seems to dominate the surface of Venus. Much of Venus is covered by ...

CHAPTER 22 | COMPARATIVE PLANETOLOGY OF VENUS AND MARS 471 Remember that the colors in this image are artifi cial; if you could ...

472 PART 4^ |^ THE SOLAR SYSTEM Chains of composite volcanoes are not found on Venus or Mars, which is evidence that subduction ...