I was visiting this website- http://crest.iiap.res.in/iaonightcam.html, where there was a picture of the night sky coming live from a Telescope. My question is, why is there so many stars in this central circular area, while so few at the other regions? What is this circular region?
Anybody with some experience with telescopes might be able to help...
1) Since the aperture of a telescope is circular, the circular bright area is the place the telescope is really looking at. The rest region is nothing but some play of light, e.i. reflection of the original image on the interior of the telescope, etc.
2) Maybe the telescope is looking at a very small portion of the sky, so this central area is some dense cluster of stars otherwise not visible through naked eye.