circumlunar flight造句

• The Gemini-Centaur proposal was predicted to have been able to achieve a 72-hour circumlunar flight.
• He was one of the first NASA managers to become involved in the decision to send Apollo 8 on a circumlunar flight.
• In the late 1960s a stripped down Soyuz variant, under the name Zond, made several attempts at circumlunar flight, with eventual success.
• The Soviets thus believed they could achieve a manned Zond circumlunar flight years before a U . S . manned lunar landing and so score a propaganda victory.
• Proton launched the unmanned Soviet circumlunar flights, and was intended to have launched the first Soviet circumlunar spaceflights, before the United States flew the Apollo 8 mission.
• The Soyuz 7K-L1 was designed to launch a crew from the Earth to circle the moon, and was the primary hope for a Soviet circumlunar flight.
• Zond 5 was the first spacecraft to carry a group of terrestrial creatures ( tortoises being the most complex ) on a circumlunar flight and return relatively safely to Earth.
• However, in his earlier book dealt with here, Heinlein was far more cautious, placing the first circumlunar flight ( not yet an actual landing ) only in 2089.
• There were also concerns from the Central Intelligence Agency that the Soviet Union was planning their own circumlunar flight for December to upstage the Americans once again ( see Zond program ).
• Judging the direct ascent approach to be the most feasible, they concentrated their attention accordingly, and proposed circumlunar flights in late 1965 using the Saturn C-3 launch vehicle.
• But the Lunar Module was not ready in time, so NASA decided to make Apollo 8 a circumlunar flight of the Command / Service Module, flown by Frank Borman, Jim Lovell, and William Anders.
• This was cancelled because of delays in achieving a reliable circumlunar flight ( only the later Zond 7 and Zond 8 members of the programme were successful ) and the Apollo 8 mission had already achieved that step in the Space Race with the United States gaining that prestige first.
• However, due to NASA's continuing problems with the CIA reports of a potential Soviet manned circumlunar flight in late 1968, NASA fatefully changed the flight plan of Apollo 8 from an Earth-orbit lunar module test to a lunar orbit mission scheduled for late December 1968.
• Photographs taken by the " McMorris " of the descent module bobbing in the ocean aroused concern at NASA that the Soviets were planning a manned circumlunar flight soon, especially since the US had been tracking Zond 5 for its entire flight, and was a catalyst for the decision to launch Apollo 8 to the Moon in December instead of its originally planned mission of testing the lunar module in high Earth orbit.