Flammable Methane Trapped Beneath Icy Lakes
Ice lake methane originates when the organic matter naturally existing at the bottom of the lake and the organic waste from the lake's surroundings decompose in water.
The flammable natural gas forms bubbles below the surface of the lake which gets trapped under the layer of ice during winter. When the ice eventually thaws, the gas escapes through the cracks.
NASA will now take "the next steps in solar sailing" after the LightSail 2 spacecraft burned up in Earth's atmosphere.