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The Sun's closest stellar neighbor, Proxima Centauri, is about 4.3 light-years from Earth.
The Sun's closest stellar neighbor, Proxima Centauri, is about 4.3 light-years from Earth. The Apollo 11 astronauts left Earth's atmosphere and traveled to the Moon at a speed of about 40,000 kilometers per hour (7 miles per second) on the Saturn V booster, the most powerful rocket ever launched - before or since. a.