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31. Most meteorites are thought to come from the asteroid belt between Mars and Jupiter.

32. All but one of these orbit in the asteroid belt, safely beyond the orbit of Mars.

33. Through the high-powered telescope, they could see that the asteroid was very irregular, and turning slowly end over end.

34. In 1976 a small asteroid, 2062 Aten, was discovered in an orbit that actually circles the Sun faster than Earth.

35. The number of trips that can be expected for a spacecraft that transports water back from an asteroid is difficult to estimate.

36. Thus the four terrestrial planets are all affected in important but very different ways by comet and asteroid impacts.

37. Three small NEAs have spectra very similar to those of basaltic achondrites and of the asteroid Vesta.

38. All this data combined will allow scientists to determine Eros's density, and any density variations deep inside the asteroid.

39. The solid residue left after baking the volatiles out of carbonaceous asteroid materials is of considerable interest in its own right.

40. Against the darkened portion of the asteroid there was a sudden, dazzling explosion of light.

41. For example, Vesta, the fourth-largest asteroid, reflects light in a unique way: some 50 meteorites match it closely.

42. The measured brightness variations over the rotation period are called the light curve of the asteroid.

43. The effects of comet and asteroid impacts are potentially damaging to life in general, and to human civilization in particular.

44. The asteroid belt is broadly zoned into bands of different classes of asteroids.

45. Scientists speculate that a giant asteroid hit Earth millions of years ago.

46. An elaborate system of spectral classes has been established by a persistent cadre of asteroid observers.

47. The first and largest asteroid discovered, Ceres, was found on the night of January 1, 1801.

48. The Father General and the asteroid and the plane and all these people working on this crazy idea.

49. It was the bicentenary of the discovery of the first asteroid.

50. The continuous bombardment of asteroid surfaces by small impactors generates a constantly replenished supply of crushed rock.

51. Asteroid lies between Mars and Jupiter.

52. Gargantuan asteroid to pass near Earth this fall.

53. Could an asteroid obliterate Los Angeles?

54. This asteroid takes 238 years to orbit the sun.

55. You're not actually going into an asteroid field?

56. Large meteorites actually come from the asteroid belt.

56. Wish you can benefit from our online sentence dictionary and make progress every day!

57. These spacecraft can be launched by electromagnetic mass drivers from the Moon to the planets, their satellites, and to the asteroid belt.

58. Dodge being hit in an asteroid belt, and get ready to land as you approach a deserted moonscape.

59. It's very unlikely that an asteroid will crash into Earth but the danger exists.

60. In March, NASA’s Messenger mission is due to become the first craft ever to orbit Mercury, and the agency’s Dawn probe will orbit one of the biggest members of the asteroid belt, Vesta, in August.