![]() A spacecraft's reward is a journey into space or orbit.Įscape velocity is the speed at which an object must travel to break free of a planet or moon's gravitational force and enter orbit. Sally's reward is the cheers of her teammates. ![]() Escape velocity (or a rousing game of Red Rover) requires an object to propel itself with enough speed and thrust to break through a barrier. If Sally breaks through the chain of arms, she's also demonstrated several key aspects to the space concept of escape velocity. Image to left: A Delta IV rocket launches at night. ![]() Did you ever watch a group of children playing "Red Rover?" Arms linked up for strength, they chant, "Red Rover, Red Rover, let Sally come over," and Sally's challenge is to break through that chain of linked arms.
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