Question

question 20 (multiple choice worth 3 points) which of the following identifies two technological advancements of space exploration history during the period between 1960 and 1989? satellites were launched by the united states, and solar energy was an invented. the first human was sent into space, and water was discovered on mars. numerous spacecraft launches resulted in technological advancements, and humans landed on the moon. robotic spacecrafts were sent to gather information about halley’s comet, and the twin voyagers gathered data from distant planets. question 21 (multiple choice worth 3 points)

Explanation:

1. Analyze Option 1: Satellites were launched by the US, but solar energy invention isn't directly a space exploration tech advancement of 1960 - 1989.
2. Analyze Option 2: Water on Mars was not discovered in this period (the first human in space was Yuri Gagarin, not in 1960 - 1989 for Mars water discovery).
3. Analyze Option 3: The moon landing (humans landed on the moon in 1969) and numerous spacecraft launches leading to tech advancements fit the 1960 - 1989 space exploration era.
4. Analyze Option 4: Robotic spacecrafts for Halley's comet (Halley's flyby missions in the 1980s) and Voyagers (launched in the 1970s, gathering data in 1960 - 1989) are valid tech advancements of that space exploration period.

So the correct options are the third and fourth (assuming the options are ordered as: 1. Satellites...; 2. The first human...; 3. Numerous spacecraft...; 4. Robotic spacecrafts...).

Answer:

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.