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61. Of the production run of nine, only three Ranger spacecraft remained.

62. Astronauts have problems moving around in the spacecraft because they are virtually weightless.

63. Short-term forecasts are required day-to-day in spacecraft management for orbit prediction.

64. These signals falsely indicated to the on board systems that the spacecraft was safely on the surface.

65. Pressures and temperatures in the Jovian atmosphere have largely been determined by spacecraft, using a variety of techniques.

66. There was no alien spacecraft, and there were no alien beings and no secret autopsies in the desert in 1947.

67. The spacecraft has sent back new data about Jupiter's atmosphere.

68. Decreasing the velocity will mean that the spacecraft moves away from perigee less quickly.

69. The most significant of these may be the use of helium-3 in spacecraft propulsion, in a fusion rocket.

70. That book contained a proposal for electrical propulsion of spacecraft, a technique we would now call ion propulsion.

71. Nova was developing in parallel as a booster capable of hurling a spacecraft to the Moon on a direct flight mission.

72. If executed close enough to the Moon, this maneuver can place the spacecraft on a collision course with the Moon.

73. Then, with a single powerful engine burn, the spacecraft can decelerate to a soft landing on the lunar surface.

74. The gravitational field has been explored in some detail by observations of the satellites and of the paths of fly-by spacecraft.

75. Endeavour also will carry a Satellite Test Unit to try out a new laser-based attitude system for positioning spacecraft.

76. Even so, the system on board the spacecraft retained some independence should contact with ground control be lost.

77. At any point on the ellipse between apogee and perigee a spacecraft will have both a horizontal and a radial velocity.

78. Meanwhile[sentencedict.com], the Soviets had launched two Luna-type spacecraft at the Moon in early 1963.

79. NASA officials found a way to work around the technical glitch on the Galileo spacecraft.

80. The spacecraft results also confirm that ground-based observations can indirectly tell us about fluctuations in the solar constant.

81. In late 1958 the United States launched three Pioneer spacecraft on missions to the Moon.

82. Spacecraft electronics systems are vulnerable to damage by high-energy charged particles and are at particular risk during magnetic storms.

83. A somewhat similar process could he used to produce thrust for a spacecraft.

84. During shuttle spacewalks, pilots can maneuver their spacecraft quickly to chase an astronaut whose security line has snapped.

85. The fully fuelled Saturn V sitting on the launch pad had a total mass some 56 times that of the Apollo spacecraft.

86. In September a second Luna spacecraft impacted on the near side of the moon.

87. Inside a spacecraft in orbit round the Earth an astronaut could float weightless, hardly in contact with the floor.

88. The Moon in a cloudless blue sky is visible directly above the spacecraft.

89. As part of the bicentennial festivities of the United States, two Viking spacecraft were landed on Mars in 1976.

90. The first spacecraft missions to the Moon were launched surprisingly soon after the dawn of the space age.