How does the Hubble Space Telescope work?
Hubble space telescope is a reflector( Ritchey-Chretien) telescope with a mirror of 2,4 meters.
To observe astronomical objects trouble free from cloud and other problems in Earth's atmosphere it is placed i n ,.low Earth orbit. The focused light from objects go to charge couple devices which convert it into digital form and send to ground receiving stations where they are converted into data and pictures. Hubble can obseserve near infra red, ultra vi-lot and visible light.
for details see link.