A new startup successfully launched a rocket into space using no fuel. The "Holy Grail" of clean, reusable, and cheap rockets has been chased for decades. This has led many to ask themselves if there's a better way to get to space than a rocket.
The U.S. military's HARP (High Altitude Research Project) proved more than 50 years ago that rockets did not need fuel to reach orbit. HARP successfully fired ballistic missiles using a giant gun tube. Other alternatives to reaching space include huge
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