The European Southern Observatory's (ESO) Extremely Large Telescope (ELT) — the world's largest visible- and infrared-light telescope — is currently under development on the Cerro Armazones mountain ...

This has a diameter of 4 Å, which is the narrowest ... of a 4 Å tubule (side walls are marked by lines) confined inside an 18-shell carbon nanotube. Although these tiny 4 Å carbon nanotubes ...