Suddenly , polar melting was no longer a distant prospect .
突然间,北极的融化已经离我们不远了。
Auroral activity results from atomic particles spiralling into the earth 's north and south polar atmosphere along magnetic field lines and then colliding with atmospheric molecules , resulting in the emission of energy in different forms including light .
极光是由于粒子螺旋进入地球南北极的大气中与分子相互碰撞而产生,造成了包括光的各种能量的释放。
The moon was once thought to be dry . Then came hints of ice in the polar craters .
月球曾被认为很干燥,而后又有迹象显示在极地的月坑有冰。
One concerned a 20-year-old hypothesis , supported by radar observations from earth , that suggested some polar craters might hide reserves of water-ice .
The deposits in the lunar craters may be as informative about the moon as ice cores from earth 's polar regions are about the planet 's past climates .
在月坑里的沉积物可能含有与月球相关的丰富信息,就像地球极地的冰芯那样,含有许多过去气候的信息。
Between now and early september , when the polar pack ice shrivels to its summer minimum , they will pore over the daily sea ice reports of america 's national snow and ice data centre .