冥王星行星科学是一份持续不断的馈赠

行星科学家在冥王星斯普特尼克号平原北缘发现了地表湿润的迹象。最新研究表明，液氮正通过该平原的裂缝涌出。这一发现基于新视野号（New Horizons）在2015年飞掠期间拍摄的图像。

Something's wetting the surface of dwarf planet Pluto along the northern edge of Sputnik Planitia, and planetary scientists have found a good explanation for it. A recent study of new Horizons images taken during the 2015 flyby revealed evidence that liquid nitrogen is rising up through cracks in Sputnik Planitia. That's the giant heart-shaped glacial basin we see in all the Pluto images taken by the spacecraft.