Getting to space requires reaching escape velocity from "summary" of Rocket Science: A Beginner's Guide to the Fundamentals of Spaceflight by Andrew Rader
To leave Earth and go to space, a rocket must travel fast enough to break free from the planet's gravitational pull. This critical speed is known as escape velocity. Reaching escape velocity is a fundamental requirement for any spacecraft aiming to venture beyond Earth's atmosphere. Without achieving this speed, a rocket would be unable to overcome the force of gravity and would eventually fall back to the ground. Escape velocity is determined by a combination of the mass of the planet and the distance from its center. The larger the planet and the closer you are to its surface, the higher the escape velocity required. For Earth, this speed is about 11.2 kilometers per second, or roughly 25,000 miles per hour. Achieving such incredible velocity is no easy feat and requires powerful rocket engines and carefully calculated trajectories. During a rocket ...
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