If Pluto's atmosphere is very different from ours and from that of other nearby planets, it could help scientists expand their understanding of exoplanet atmospheres. But right now, an accompanying paper [paywalled] points out, this is just a good guess based on data from New Horizons and a sophisticated computer model, not direct observations of the haze's composition. There are other theories floating around to explain Pluto's cool temperatures, including blaming the frigid air on gases in the atmosphere. Luckily, the authors will get a chance to test their notions when the James Webb Space Telescope launches in 2019. That observatory can detect infrared light, which the hazy Plutonian atmosphere would be positively glowing with as it scattered sunlight. The researchers just have to wait and see if the light from the telescope validates their bright idea.