Which of the following identifies two technological advancements during the dawn of the space age between 1951 and 1959?
a. the first successful orbiting satellite was launched by the soviet union, and several space craft launches in the advancement of space exploration.
b. the first human was sent into space, and water was discovered on mars.
c. numerous spacecraft launches resulted in technological advancements, and humans landed on the moon.
d. robotic spacecrafts were sent to gather information about halley’s comet, and the twin voyagers gathered data from distant planets.
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