How can anyone pass up reading an article with a headline like this:

“A Plan to Build a Giant Liquid Telescope on the Moon”

It turns out that the concept of using spinning liquid as a telescopic mirror is a century and a half old, the benefits of basing a massive telescope on the lunar surface are broadly appreciated, and the project would cost far less than NASA’s currently planned $4.5 billion space telescope.

However, a sizable lunar-based instrument would probably have to be assembled by hand, rather than just robotically. But if we are going back anyway. . .