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21.Mars’ seasons are twice as long as those on Earth because it takes Mars 687 days to orbit the sun, twice as long as Earth’s 365-day journey.a

22.With no large moon like Earth’s to stabilize it, Mars periodically tilts much more toward the sun, creating warmer summers on Mars than it otherwise would have.d

[[23.The Earth’s moon is 240,000 miles away. Earth’s next closest neighbor is Venus, which comes as near as 24 million miles. After the moon and Venus, Mars is our next closest neighbor at 34 million miles away—though when Mars and Earth are at the opposite sides of their orbits around the sun, they are separated by 249 million miles.e]]

24.Mars is home to Hellas, a vast and featureless plain that covers 1300 miles (the size of the Caribbean Sea). It was created by asteroids crashing into the planet’s surface of Mars nearly four billion years ago

25.During a Mars winter, almost 20% of the air freezes

[[26.Mars’ moon Phobos (“fear”) rises in the west and sets in the east—twice a day. Deimos (“panic”), on the other hand, takes 2.7 days to rise in the east and set in the west. The moons are named after the twin gods who accompanied Ares (or Mars) into battle.e]]

[[27.Mars’ moon Phobos (fear) rises in the west and sets in the east—twice a day. Deimos (panic), on the other hand, takes 2.7 days to rise in the east and set in the west. Mars’ moons are so named because the twin gods—panic and fear—accompanied Ares (or Mars) into battle]]

28.Phobos orbits remarkably close to Mars and is gradually sinking into the Red Planet. In about 50 million years it will either crash into Mars or break up and form a small ring around the planet.e

[[29.Mars has no magnetic field, indicating that it does not have a molten metal core, like Earth does. However, there is evidence that Mars once had a magnetic field and that the field experienced reversals, much like Earth’s magnetic field which reverses every few thousand years.b]]

30.Mars has 37.5% of the gravity that Earth has. This means that a 100-pound person on Earth would weigh only 38 pounds on Mars and could jump three times as high.a

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