Which observational instrument has been instrumental in searching for transiting planets in globular clusters?

Answer

The Hubble Space Telescope.

Astronomers have used the sharp eye of the Hubble Space Telescope, searching for the characteristic dimming pattern caused by a planet passing in front of its star (a transit).

Which observational instrument has been instrumental in searching for transiting planets in globular clusters?
astronomyplanetsstarsexoplanetsstar formationastrophysicsstellar dynamicsglobular clustersGlobular cluster