![The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it](https://www.nasa.gov/wp-content/uploads/2023/03/pia21421.jpg)
Spitzer Observes TRAPPIST-1
Spitzer Space Telescope, one of agency’s great observatories, one of Spitzer's great discoveries was that of the TRAPPIST-1 star, an ultra-cool dwarf, which has seven Earth-size planets orbiting it.
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https://www.nasa.gov/image-detail/spitzer-observes-trappist-1/
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