Question

What does the Hubble Space Telescope do?

Answer 1

Hubble space telescope is operating at about 400 kilometers above surface of earth observing universe in Near UV, Visible light and near Infra red wave length..

Explanation:

Since it is above earth's atmosphere it can observe sky with out problems of atmospheric refraction, clouds etc.
It is observing universe Galaxies, nebula, planets, comets. asteroids,minor planets stars,black hole etc.
Its main mirror is 2.4 meter diameter.