Astronomer Sir William Herschel had which of these named after him?

just in case people wonder, as per wikipedia, The Herschel Space Observatory was a space observatory built and operated by the European Space Agency (ESA). It was active from 2009 to 2013, and was the largest infrared telescope ever launched

with only patience and a single lens: nice !

I'd heard of Cassegrain telescopes, but not this type.

little b, I had a microscope and a telescope when I was a kid. Both were great for learning and fun.

I thought it was some kind of a bag. Lol

If you want to get smart you just have to read books and descover the internet for new amazing information.

for a sec, I thought chocolate will appear on the choices