Clouds may keep exoplanets cool
Even when close to their stars, other worlds could harbor liquid water
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/07/ew_chpiwbgyts16089.20130701_feat.jpg?fit=860%2C460&ssl=1)
Clouds may keep Earth-sized exoplanets that sit close to their stars cool enough to have liquid water, as in this artist's conception.
Illustration by Lynette Cook