Artist's concept of an exoplanet.

Have you ever wondered if there’s life on other planets? There are certainly many planets to choose from!

Aleksander Wolszczan and Dale Frail spotted the first planet outside our solar system in 1992. Now, more than 5000 exoplanets have been found.

“It’s not just a number,” said NASA’s Jessie Christiansen. “Each one of them is a new world, a brand-new planet. I get excited about every one because we don’t know anything about them.”