SpaceX launched a joint NASA-European environmental research satellite early Monday, the second in an ongoing billion-dollar project to measure long-term changes in sea level, a key indicator of climate change .

The first satellite, known as Sentinel-6 and named in honor of NASA climate researcher Michael Freilich, was launched in November 2020 . The latest spacecraft, Sentinel-6B, was launched from California atop a Falcon 9 rocket at 12:21 a.m. EST.

A SpaceX Falcon 9 rocket streaks into the night sky above Vandenberg Space Force Base in California, boosting a sophisticated environmental research satellite into orbit to monitor changes in sea level around the world. SpaceX webcast

Both satellites are equipped with a sophisticated cloud-penetrating radar. By timing how long it

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