There are four: Hubble Space Telescope, Compton Gamma Ray Observatory, Chandra X-ray Observatory, and the Spitzer Space Telescope.
One synonym for astronomical observatories is "space observatories."
Yes, there are many observatories all around Europe.
I take that you are asking 'astronomical observatories'. 'Observatory' is a noun, observatories is the plural form. Astronomical is simple a modifier (adjective, in this case.)
The Mercury program
Siegfried Marx has written: 'Sternwarten der Welt' -- subject(s): Astronomical observatories 'Observatories of the world' -- subject(s): Astronomical observatories
Apollo 11
Alt-azimuth is the mount ussually found in professional observatories.
There are thousands of observatories in the world, ranging from small amateur setups to large professional facilities. The exact number can vary as new observatories are built and existing ones are decommissioned.
alan shephard
yes
mountains
observatories