Why So Few Habitable Exoplanets Found? It May Be Due To The Wrong Tools

"The Planetary Habitability Laboratory database at the University of Puerto Rico’s Arecibo telescope facility counts just 10 exoplanets that are likely to be habitable.² Ten, out of 3,375. That statistic creates an image of a universe filled with gas giants, flaming hot lava spheres and frozen snowballs — with nary a cozy, just-right second Earth to be found.

"Appearances, however, can be deceiving. The list of habitable exoplanets is so short not because there aren’t many, scientists told me, but because the tools we use to find exoplanets are biased."

Why It’s So Hard To Find The Next Earth, Even If You’re Looking Right At It