Merry Christmas

A very Merry Christmas to both my readers

A very Merry Christmas to you all.
(The William Herschel Telescope has a laser to measure atmospheric turbulence, in order to correct for it. But really, it’s very low powered and no danger to flying reindeer. Santa is quite safe.)

Posted by sheila

Sheila came to La Palma with a six month contract and has stayed 24 years so far. She used to work as a software engineer at the observatory, but now she's a writer and Starlight guide.