What is the main topic of the article?
It is about exoplanets, planets that orbit outside our solar system.
What are exoplanets?
Exoplanets are planets that orbit other stars other than our Sun.
How have scientists been able to learn more about exoplanets? 2 examples.
Advancements in technology, such as the Kepler Space Telescope and the Transiting Exoplanet Survey Satellite (TESS)