鈥楾he planet we care about most鈥�: New satellite maps water on Earth
A U.S.-French satellite that will map almost all of the world鈥檚 oceans, lakes, and rivers rocketed into orbit Friday.
The predawn launch aboard a SpaceX rocket from Vandenberg Space Force Base in California capped a highly successful year for NASA.
Nicknamed SWOT 鈥� short for Surface Water and Ocean Topography 鈥� the satellite is needed more than ever as climate change worsens droughts, flooding, and coastal erosion, according to scientists. Cheers erupted at control centers in California and France as the spacecraft started its mission.
鈥淚t is a pivotal moment, and I鈥檓 very excited about it,鈥� said NASA program manager Nadya Vinogradova-Shiffer. 鈥淲e鈥檙e going to see Earth鈥檚 water like we鈥檝e never before.鈥�
About the size of an SUV, the satellite will measure the height of water on more than 90% of Earth鈥檚 surface, allowing scientists to track the flow and identify potential high-risk areas. It will also survey millions of lakes as well as 1.3 million miles of rivers, from headwater to mouth.
The satellite will shoot radar pulses at Earth, with the signals bouncing back to be received by a pair of antennas, one on each end of a 33-foot boom.
It should be able to make out currents and eddies less than 13 miles across, as well as areas of the ocean where water masses of varying temperatures merge.
NASA鈥檚 current fleet of nearly 30 Earth-observing satellites cannot make out such slight features. And while these older satellites can map the extent of lakes and rivers, their measurements are not as detailed, said the University of North Carolina鈥檚 Tamlin Pavelsky, who is part of the mission.
Perhaps most importantly, the satellite will reveal the location and speed of rising sea levels and the shift of coastlines, key to saving lives and property. It will cover the globe between the Arctic and Antarctica at least once every three weeks, as it orbits more than 550 miles high. The mission is expected to last three years.
Laurie Leshin, the director of NASA鈥檚 Jet Propulsion Laboratory in Pasadena, California, noted that while the agency is known for its Mars rovers and space telescopes, 鈥渢his is the planet we care most about.鈥�
鈥淲e鈥檝e got a lot of eyes on Earth,鈥� with even more globe-surveying missions planned in the next few years, she added.
NASA and the French Space Agency collaborated on the $1.2 billion SWOT project 鈥� some 20 years in the making 鈥� with Britain and Canada chipping in.
Already recycled, the first-stage booster returned to Vandenberg eight minutes after liftoff to fly again one day. When the double sonic booms sounded, 鈥淓verybody jumped out of their skin, and it was exhilarating. What a morning,鈥� said Taryn Tomlinson, an Earth science director at the Canadian Space Agency.
It鈥檚 the latest milestone this year for NASA. Among the other highlights are glamor shots of the universe from the new Webb Space Telescope, the Dart spacecraft鈥檚 dead-on slam into an asteroid in the first planetary defense test, and the Orion capsule鈥檚 recent return from the moon following a test flight.
This story was reported by The Associated Press.聽The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute鈥檚 Science and Educational Media Group. The AP is solely responsible for all content.
