Some of the best telescopes are in orbit because the earth atmosphere distorts the light from distant stars,which is something scientist and astronomers would rather avoid.
That is not the case. While countries may share the cost of launching a telescope into space (and share the time on it), individual countries have launched their own telescopes - eg Hubble is not international, it belongs to NASA/US.
Terrestrial telescopes are generally manned, while space telescopes are unmanned. However, to a greater and greater extent, the people doing the observing are not the people actually manning the telescopes; the observations are done remotely from other universities around the world. The various space telescopes, such as the Hubble, the Kepler, or the Spitzer, or the soon-to-be-launched Webb, are remotely controlled in the same manner that everything is controlled these days; remotely, via computer.
cause they gather light and concentrate it.
Their eyes, ground-based telescopes, space telescopes.
reflecting and refracting telescopes
They must be launched in to space because there is a better veiw in space than from earth.
jhb
That is not the case. While countries may share the cost of launching a telescope into space (and share the time on it), individual countries have launched their own telescopes - eg Hubble is not international, it belongs to NASA/US.
Robot space probes and telescopes
Telescopes are used to see things that are far away from earth. Using telescopes we can see things that are millions of miles away. Most of the telescopes are on Earth but some of them are in space such as the Hubble Space Telescope.
All space telescopes are unmanned - unless you want to count the small telescopes on the Shuttle or IIS as space telescopes.
Telescopes on Earth have to look through the atmosphere (air) which distorts the image. Telescopes in space dont have to look through the atmosphere and so the image is a lot clearer.
Nothing will "replace" the Hubble Space Telescope. However, a couple of new space telescopes are already in space, and another much more powerful one, the Webb Space Telescope, is under construction and should be launched in 2014.
Terrestrial telescopes are generally manned, while space telescopes are unmanned. However, to a greater and greater extent, the people doing the observing are not the people actually manning the telescopes; the observations are done remotely from other universities around the world. The various space telescopes, such as the Hubble, the Kepler, or the Spitzer, or the soon-to-be-launched Webb, are remotely controlled in the same manner that everything is controlled these days; remotely, via computer.
Telescopes have helped discover many things in space that are not visible such as some of the outer planets of our solar system.
Gamma, X-ray, Optical, and Radio
hubble space station