Currently the largest optical telescope is "The Great Canary Telescope" (Gran Telescopio Canarias) in Spain, it has an apeture of 10.4 metres. There is an optical telescope under construction in Chilie that when completed will have an apeture of 21.4 metres, called the Giant Magellan Telescope. The largest single dish apeture radio telescope is the Arecibo Radio Telescope in Puerto Rico which is 305 metres.
No, the biggest telescope in the world currently is the Large Binocular Telescope. But Hubble is the biggest spacetelescope.
The Hubble Space Telescope is the biggest telescope in space at this time.
The Sutherland telescope
Kepler telescope in Hawaii
optical teloscope
Yes currently although the James Web Telescope will be bigger when it is launched.
ladakh
Southern African Large Telescope Gemini North Observatory
Galileo's biggest challenge that he has faced is building telescope.
yercaud ooty
France
The Hubble Telescope