Vastavam web: A powerful Atlas 5 rocket was poised for liftoff early on Saturday from Vandenberg Air Force Base in California, carrying to Mars the first robotic NASA lander designed entirely for exploring the deep interior of the red planet.The Mars InSight probe was due to blast off from the central California coast at 4:05 a.m. PDT (1105 GMT), creating a luminous predawn spectacle of the first U.S. interplanetary spacecraft to be launched over the Pacific.
The payload will be released about 90 minutes after launch on a 301 million-mile (484 million km) flight to Mars. It is due to reach its destination in six months, landing on a broad, smooth plain close to the planet’s equator called the Elysium Planitia.That will put InSight roughly 373 miles (600 km) from the 2012 landing site of the car-sized Mars rover Curiosity.The new 800-pound (360-kg) spacecraft marks the 21st U.S.-launched Martian exploration, dating to the Mariner fly-by missions of the 1960s. Nearly two dozen other Mars missions have been launched by other nations.
Scientists expect to see a dozen to 100 marsquakes over the course of the mission, producing data to help them deduce the depth, density and composition of the planet’s core, the rocky mantle surrounding it and the outermost layer, the crust.The Viking probes of the mid-1970s were equipped with seismometers, too, but they were bolted to the top of the landers, a design that proved largely ineffective.
Apollo missions to the moon brought seismometers to the lunar surface as well, detecting thousands of moonquakes and meteorite impacts. But InSight is expected to yield the first meaningful data on planetary seismic tremors beyond Earth.Meanwhile, a special transmitter on the lander will send radio signals back to Earth, tracking Mars’ subtle rotational wobble to reveal the size of the planet’s core and possibly whether it remains molten.