The three planets are among the smallest and closest exoplanets found to date, according to astronomers.
TESS may uncover planets that have the right conditions for life to exist.
The test photo includes more than 200,000 stars.
TESS will scour the skies for signs of undiscovered worlds.
Scientists are excited about the prospect the mission holds for new discoveries, but if you're just learning about the mission now, here's what you need to know.
NASA asked kids to submit their depictions of exoplanets for the satellite's launch.
The spacecraft has spotted almost three-quarters of the alien planets scientists have identified to date.
Loner stars had been tricky to understand, and now scientists can get a better handle on them.