By Alaa Elassar and Nadeem Muaddi chat with us in Facebook Messenger at 9: 52 AM on September 15, 2018.
Find out what is happening in the world. (CNN)
On Saturday, NASA launched state-of-the-art laser devices into space to measure changes in the height of Earth's polar ice and other terrain features. 3-2-1. . .
We launched @ nasa _ ice's ICESat2 on ULAlaunch's DeltaII rocket? .
When we are live from Vandenberg Air Force Base in California, listen to: picture. twitter.