Final answer:
The sentence from paragraph 2 is included to provide a potential real-life consequence to the threat caused by the Sputnik launch. It suggests that the Soviet Union could use its rocket technology to launch intercontinental missiles with nuclear warheads.
Step-by-step explanation:
The sentence from paragraph 2, 'If the Soviet Union had a rocket that could launch objects into space, then it was possible they could launch intercontinental missiles armed with nuclear warheads,' is included by the author to provide a potential real-life consequence to the threat caused by the Sputnik launch. This sentence suggests that if the Soviets had the capability to launch objects into space, they could potentially use that technology to launch intercontinental missiles with nuclear warheads. This adds weight to the concern about the Soviet space program and its implications for national security.