3 ms·
1. They sometimes are. The imaging here uses a telescope. (Coronagraphs work on Earth-based telescopes too: https://en.wikipedia.org/wiki/Coronagraph https://
by mkl 1y ago
1. They sometimes are. The imaging here uses a telescope. (Coronagraphs work on Earth-based telescopes too: https://en.wikipedia.org/wiki/Coronagraph https://en.wikipedia.org/wiki/Coronagraph.)
2. They don't need to be. Most telescopes aren't trying to image the corona of the sun or another star.
3. Space-based telescopes are really expensive and have significant limitations on size, shape, mass, etc.
- prats226 1y agoSorry I meant instead of having one big piece of metal which would have restriction in terms of length, having 2 pieces of lenses seperated by just vaccum? You would have lesser material, easier launch and higher magnification because of larger focal length etc?