Which space telescope missions have provided data used to estimate planetary abundance?

Answer

The Kepler Space Telescope

Data derived from missions such as the Kepler Space Telescope have been crucial in determining the prevalence of planets within the Milky Way. This research indicates that, on average, there is at least one planet for every star in our galaxy, a statistic that scientists apply to other spiral galaxies to project their likely planetary populations.

Which space telescope missions have provided data used to estimate planetary abundance?
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