@CNN: The European Space Agency released an image taken by its Mars Express mission showing the Korolev crater filled with water ice. The crater is more than 50 miles across and located just south of the Red Planet’s northern polar cap. https://t.co/reybGEjTWh https://t.co/YnWZ0ETtk2

@CNN: The European Space Agency released an image taken by its Mars Express mission showing the Korolev crater filled with water ice. The crater is more than 50 miles across and located just south of the Red Planet’s northern polar cap. https://t.co/reybGEjTWh https://t.co/YnWZ0ETtk2