If astronauts attempt interplanetary space travel, then heavy shielding will be required to protect them from solar radiation. If massive amounts of either fuel or water are carried, then the spacecraft must be very large. Therefore, if heavy shielding is required to protect the astronauts from solar radiation only if massive amounts of fuel are carried, then if astronauts attempt interplanetary space travel, then the spacecraft must be very large. (A = Astronauts attempt interplanetary space travel. H = Heavy shielding will be required to protect astronauts from solar radiation. F = Massive amounts of fuel are carried. W = Massive amounts of water are carried. L = The spacecraft must be very large.)

If astronauts attempt interplanetary space travel, then heavy shielding will be required to protect them from solar radiation. If massive amounts of either fuel or water are carried, then the spacecraft must be very large. Therefore, if heavy shielding is required to protect the astronauts from solar radiation only if massive amounts of fuel are carried, then if astronauts attempt interplanetary space travel, then the spacecraft must be very large. (A = Astronauts attempt interplanetary space travel. H = Heavy shielding will be required to protect astronauts from solar radiation. F = Massive amounts of fuel are carried. W = Massive amounts of water are carried. L = The spacecraft must be very large.)

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