@CNN: NASA on Saturday will launch its most advanced laser device into space to measure changes in the heights of Earth’s polar ice, as well as other topographical features https://t.co/oXaVjU5CGw https://t.co/4aeMDPKvAs

@CNN: NASA on Saturday will launch its most advanced laser device into space to measure changes in the heights of Earth’s polar ice, as well as other topographical features https://t.co/oXaVjU5CGw https://t.co/4aeMDPKvAs