Most asteroid flybys pass millions of kilometers away from Earth, too distant to notice. But one upcoming encounter will be ...

Gold prices have shattered records in 2025 as global instability reshapes where nations and investors seek safety.

1803 年 4 月，美国特使门罗与法国签订《路易斯安那购买条约》： 以1500万美元（约合今日 3.4 亿美元 ）购得从密西西比河到落基山脉的 82.8 万平方公里 土地。 一夜之间，美国的领土几乎翻倍，从“东部小国”变成横跨大陆的“潜在强国”。

NASA’s ambitious OSIRIS-APEX mission to study the asteroid Apophis has been spared from cancellation, but its future is far ...