Jerry
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Electromagnetic Spectrum
Light
Optics
Optical Stuff
Optical Instruments
Spyglasses (to spy on the enemy)
Telescopes (1609)
Telescope Observatories around the World (and in Space)
Space Observatories
Attachments
Space observatory
Parents
Telescope Observatories around the World (and in Space)
Children
Gaia (2013)
NASA's Great Observatories
New Worlds Observatory