NASA滞留宇航员成功返回地球
在经历了286天计划外太空任务后，NASA宇航员布奇·威尔莫尔和苏尼·威廉姆斯于本周二结束创纪录的9个月太空滞留，搭乘SpaceX龙飞船安全降落在墨西哥湾。NASA连续推迟返回时间表，最终选择切换到SpaceX作为救援方案。考虑到本周晚些时候的不稳定天气，NASA提前让他们启程。
两位宇航员的太空飞行历程创造多项记录：累计行程1.95亿公里（1.21亿英里），完成4,576次地球轨道运行，威廉姆斯更以62小时太空行走刷新女宇航员累计时长记录。在延长期内，他们转型为正式空间站成员，承担设备维修、科学实验等任务，威廉姆斯还担任过空间站指挥官。
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A project of our size needs at least a few hundred million dollars per year to keep going,” Mr. Durov wrote in his public channel on Telegram late last year. “While doing that, we will remain independent and stay true to our values, redefining how a tech company should operate.
Bitcoin is a decentralized digital currency that you can buy, sell and exchange directly, without an intermediary like a bank. Bitcoin’s creator, Satoshi Nakamoto, originally described the need for “an electronic payment system based on cryptographic proof instead of trust.” Each and every Bitcoin transaction that’s ever been made exists on a public ledger accessible to everyone, making transactions hard to reverse and difficult to fake. That’s by design: Core to their decentralized nature, Bitcoins aren’t backed by the government or any issuing institution, and there’s nothing to guarantee their value besides the proof baked in the heart of the system. “The reason why it’s worth money is simply because we, as people, decided it has value—same as gold,” says Anton Mozgovoy, co-founder & CEO of digital financial service company Holyheld.
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