LEGO just revealed the Star Wars Ultimate Death Star set, which is a massive beast that includes over 9,000 pieces. The company says it's the largest LEGO Star Wars set ever made. It's also the most ...
Laser pushed sails—ultrathin need reflective structures that are square meters but weight a gram. If the sails and the payload each weigh a gram, such a spacecraft could accelerate to one fifth of the ...
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