NASA confirmed that there are over 5,000 exoplanets (alien worlds) that

have been discovered outside our solar system.  

This is a major milestone in the search for life beyond Earth, and 

it shows that there are likely many more exoplanets out there that we have yet to find. 

The first exoplanet was discovered in 1992, and since then, 

the number of known exoplanets has been growing rapidly.  

The most recent exoplanets have been discovered using a variety of methods, 

including direct imaging, transits, and gravitational microlensing.