Multiple Choice
The main practical problem associated with building an interstellar ramjet is
A) making the ship large enough to scoop up enough hydrogen fuel given that the density of hydrogen in space is so low
B) producing enough thrust to accelerate the spacecraft to a high enough speed
C) separating the matter and antimatter fuels from each other
D) receiving enough photon energy to propel the craft
Correct Answer:

Verified
Correct Answer:
Verified
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