UNIVERSE
CELESTIAL MECHANICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They continue to fall toward the Earth but miss the ground due to their horizontal speed
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They continue to fall toward the Earth, but stay in space by constantly firing their rockets
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They have successfully overcome gravity and no longer fall toward the Earth
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None of the above
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Detailed explanation-1: -If 90 percent of Earth’s gravity reaches the space station, then why do astronauts float there? The answer is because they are in free fall. In a vacuum, gravity causes all objects to fall at the same rate. The mass of the object does not matter.
Detailed explanation-2: -You won’t immediately freeze or explode when you fall from space without wearing a space suit. You will have consciousness for around 15 seconds, post which you are likely to black out. Death will occur in around three minutes due to asphyxiation.
Detailed explanation-3: -On Earth you can feel it by standing or sitting up too fast. Gravity has much the same effect on astronauts returning from a long spell in space: Blood rushes down and the space travelers become, literally, lightheaded.
Detailed explanation-4: -The answer is gravity: an invisible force that pulls objects toward each other. Earth’s gravity is what keeps you on the ground and what makes things fall.
Detailed explanation-5: -In order to leave orbit, a spacecraft needs to be going fast enough to break free of gravity. A huge push is needed to do that. Either that push was given to a ship as it was launched or it is given to a ship already in orbit.