Meanings of base observatories in English

The planets were detected using Nasa's Spitzer Space Telescope and several ground- based observatories are described in the journal Nature.

As expected, measurements of these ripples taken by satellites and ground- based observatories reveal there's more dark matter than conventional matter in our universe.

Here we report observations from multiple Earth- based observatories of Haumea passing in front of a distant star (a multi-chord stellar occultation).