航天&宇宙

3I/ATLAS, the third interstellar visitor captured by astronomical observation. 11 billion years old—older than the Sun. Like Oumuamua in 2017, it too displays non-gravitational acceleration, stepping on the gas as it leaves the solar system.

Over 10,000 tons of space debris orbit Earth—threats to every active satellite, yet also a precious orbital resource. The proposal: build repair stations in graveyard orbits, turning debris from a civilization-locking threat into an unlocking key.

地球城经济的S曲线正在触顶；太空经济的S曲线需要精心启动。地球的资源尚有余量，但余量正在以可预见的速度减少。

As humanity races to build lunar bases and mine the Moon, a question looms: could large-scale lunar engineering disrupt the Earth-Moon gravitational balance? The physics says yes—in several ways.

Amdahl's Law teaches a brutal lesson: a system's speed is capped by its slowest component. For space economy, that bottleneck is manufacturing. Without orbital factories, no amount of cheap launch capacity will unlock the solar system.

The Tsiolkovsky equation dictates that most of a rocket's energy is spent lifting its own fuel. But what if we could rewrite the equation by refueling in orbit? The "Tsiolkovsky gap" is the unexplored efficiency frontier between chemical rockets and the solar system.

Deflecting an asteroid with kinetic impact might save Earth—or it might fragment the object into multiple deadly projectiles. The physics is simple; the consequences are anything but.

The rocket equation seems simple: more fuel = more speed. But the exponential nature of the equation hides a brutal truth—every kilogram of payload costs exponentially more as your velocity target rises. This equation is not just about rockets; it is about the fundamental limits of ambition.

人类确切观测到的首个太阳系外来客体。无法解释的异常加速、费米悖论谜团——远方信使带来的五个启示。