I believe some of them can, but mostly, the exoplanets are discovered and observed with more indirect methods - especially by analyzing the gravitational effects on the star.
The Voyager 2 space probe flew past Neptune in 1989. Other than that it has only been observed by Earth-based telescopes.
Traditionally, an astronomer directly observed the stars, but nowadays some astronomers instead use data automatically generated by properly programmed telescopes or satellites.
All space telescopes are unmanned - unless you want to count the small telescopes on the Shuttle or IIS as space telescopes.
Yes, there are telescopes aboard many satellites that perform astronomical observations.
by using telescopes and satellites.
Mainly telescopes, satellites, etc.
We use telescopes or satellites
No. Pluto has been observed solely from Earth by telescopes including the Hubble Space Telescope. The NASA probe "New Horizons" was launched in 2006 and should arrive at Pluto in 2015.
they use space probes,satellites,and of coarse,telescopes.
Satellites
Either by actually seeing it with telescopes, or by seeing the effect that it's gravity has on nearby objects.
Telescopes, satellites, space ships, and rovers!