Exoplanets are planets outside of the..., galaxy, space, Solar system, universe, How many exoplanets have been discovered so far?, hundreds, dozens, thousands, millions, What are scientists searching for in exoplanets?, anything, science, energy, life, What is the zone where liquid water might exist?, Fluid zone, Liquid zone, Splash zone, Habitable zone, Which part of an exoplanet do scientists like to study?, aura, underground, atmosphere, core, What do scientists study about an exoplanet's atmosphere?, hues, molecules, density, scents, Exoplanets are usually very..., big, diverse, weird, funky, K2-141b is covered in hot molten rock, so it is called a..., ball of fire, red hot, burning flame, lava planet.

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