Exoplanet 'haze' makes it harder to identify water on alien worlds. Scientists may have a solution 

 Planetary scientists simulate how haze might be obstructing our view of exoplanet's atmospheres, and potentially alien water. 

https://cdn.mos.cms.futurecdn.net/impsFKK3H838QF26hE3H8k.jpg

https://www.space.com/hazy-atmospheres-water-exoplanets-worlds-beyond-earth