1929年，天文学家哈勃发现几乎所有星系都在远离我们，而且越远的星系退行速度越快——这意味着宇宙正在膨胀。往回倒推，138亿年前，整个宇宙曾压缩在一个比针尖还小的点上，一次"大爆炸"之后，空间本身开始膨胀，才有了后来的星系、恒星和我们。

In 1929, astronomer Edwin Hubble discovered that almost all galaxies are moving away from us, and the farther away a galaxy is, the faster it recedes — meaning the universe is expanding. Tracing this backward, 13.8 billion years ago the entire universe was compressed into a point smaller than a pinhead. After a single "Big Bang," space itself began to expand, eventually giving rise to galaxies, stars, and us.

黑洞是大质量恒星死亡后留下的产物：当它自身的引力大到连光都无法逃脱，就形成了黑洞。2019年，人类第一次用"事件视界望远镜"拍到了黑洞的真实照片——一个橙红色光环包围着中心的黑暗区域，那个边界叫"事件视界"，一旦跨过去，就再也回不来了。

A black hole is what remains after a massive star dies: when its own gravity becomes so strong that not even light can escape, a black hole is formed. In 2019, humanity captured the first-ever real photograph of a black hole using the Event Horizon Telescope — an orange-red ring of light surrounding a dark central region. That boundary is called the "event horizon," and once you cross it, there is no coming back.

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