美军拟在太平洋岛屿测试"火箭货运" 90分钟全球投送军事物资
美国空军宣布将在太平洋约翰斯顿岛建造两座火箭着陆平台，测试"火箭货运先锋"计划。该计划旨在利用可重复使用火箭（推测为SpaceX技术）将军事物资送入太空后精准投送，实现90分钟内全球到达的战略补给能力。
选址位于夏威夷西南700海里的约翰斯顿环礁。评估报告将于4月初公布并开放公众评议。
美军自2020年起就探索太空物流方案，退役将领曾设想"1小时内投送C-17运输机载货量"。尽管单次发射成本仍高达数千万美元，远超传统空运，但军方认为这种突破性能力将重塑军事后勤体系，为紧急战备和人道救援提供新选择。
Gizmodo
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BY 科技圈🎗在花频道📮
Like a stock, you can buy and hold Bitcoin as an investment. You can even now do so in special retirement accounts called Bitcoin IRAs. No matter where you choose to hold your Bitcoin, people’s philosophies on how to invest it vary: Some buy and hold long term, some buy and aim to sell after a price rally, and others bet on its price decreasing. Bitcoin’s price over time has experienced big price swings, going as low as $5,165 and as high as $28,990 in 2020 alone. “I think in some places, people might be using Bitcoin to pay for things, but the truth is that it’s an asset that looks like it’s going to be increasing in value relatively quickly for some time,” Marquez says. “So why would you sell something that’s going to be worth so much more next year than it is today? The majority of people that hold it are long-term investors.”
n the U.S. people generally use Bitcoin as an alternative investment, helping diversify a portfolio apart from stocks and bonds. You can also use Bitcoin to make purchases, but the number of vendors that accept the cryptocurrency is still limited. Big companies that accept Bitcoin include Overstock, AT&T and Twitch. You may also find that some small local retailers or certain websites take Bitcoin, but you’ll have to do some digging. That said, PayPal has announced that it will enable cryptocurrency as a funding source for purchases this year, financing purchases by automatically converting crypto holdings to fiat currency for users. “They have 346 million users and they’re connected to 26 million merchants,” says Spencer Montgomery, founder of Uinta Crypto Consulting. “It’s huge.”
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