Earth the exoplanet

Compared to exoplanets, we know a lot about the Earth. It’s our home planet and the one that shapes our expectations when we study other worlds. Planetary science evolved out of Earth science. Exoplanet models started out as Earth climate models. Yet research on Earth throughout its history shows that the climate has been veryContinue reading “Earth the exoplanet”

Water cloud, acid cloud, iron cloud

A little while ago my kitchen sink had a serious clog. The emergency plumber worked on it for two hours. After failing to clear it with the manual plumbing snake and the much larger, electric plumbing snake, he finally tossed in the towel and poured a bottle of 80% sulphuric acid (chemical formula H2SO4) downContinue reading “Water cloud, acid cloud, iron cloud”