我们在系外行星（exoplanet）上究竟能发现什么？第二部分：寻找另一个地球（Earth）的机器

宜居世界天文台（Habitable Worlds Observatory，HWO）旨在直接成像另一个宜居的地球。该任务面临着遮挡行星强光、制造皮米级稳定镜面以及解析复杂大气成分等多重技术挑战。

The Habitable Worlds Observatory is being built for one purpose: to directly image another living Earth. Inside the coronagraph that must block ten billion times the planet's light, the picometer-stable mirror we don't yet know how to build, and the messy problem of reading an atmosphere.