After the success of the Sputnik launch, the United States feared that -they would never be able to launch their own satellite.
-the USSR had used technology developed by the United States.
-the Soviets had superior nuclear capabilities. <---?
-that any future US satellites would not be as successful.

 After the success of the Sputnik launch, the United States feared that

Explanation:   After the success of the Sputnik launch in 1957, the US feared that they would not be able to send satellites to space. Their earlier attempts of building and sending a spacecraft failed miserably, and the Soviets successfully did it. It gave rise to the era of cold war.

answer: because they get bored or smth idk

studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.