Converse of object

• orbit: This detailed view of the horse's head is being released to celebrate the orbiting observatory 's eleventh anniversary.

• build: Lower capital cost when building the observatory - no need for living accommodation, etc for astronomers.

• establish: Scientists in France and Italy are establishing a three-kilometer observatory near Pisa, Italy.

Preposition: on

• top: The brave can choose an observatory on the top of an extinct volcano.

Adjective modifier

• ground-based: Most of the data taken from the UK's ground-based observatories are held in storage at the IoA.

• space-borne: Abstract LISA will be the first space-borne gravitational wave observatory.

• space-based: The space-based observatory LISA is scheduled to launch in 2011.

• meteorological: The meteorological observatory, with its Stevenson Screen, is atop a small rise.

• infrared: Scientific Impact The JWST will be the world leading infrared observatory for the next decade.

Modifies a noun

• building: The main observatory building houses three larger telescopes used for research projects.

Noun used with modifier

• seafloor: Bond finance - is unlikely to be used for a seafloor observatory network project given its small size.

• gamma-ray: From here ESA's gamma-ray observatory sends back to Earth new information about the most exciting phenomena in the universe.

• X-ray: Chandra is NASA's flagship X-ray observatory mission, successfully launched on July 23rd 1999.