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Nasa's latest Mars craft arrives in landing for an unprecedented seismic mission

nasa's first spacecraft built to explore the deep interior of another world streaked towards a landing scheduled for Monday is the vast, barren plain on Mars, carrying instruments to detect planetary heat seismic rumblings never measured anywhere but Earth.

After sailing 301 million miles (548 million km) on a six-month voyage through deep space, the robot lander InSight was due to touch down the dusty, rock-strewn surface of the Red Planet at about 3 pm EST (2000 GMT) .

If all goes according to plan, InSight will hurtle through the top of the thin Martian atmosphere at 12,000 miles per hour (19,310 miles per hour). Slow down by friction, deployment of a giant parachute and retro rockets, InSight will descend 77 miles through pink Martian skies to the surface in 6 1/2 minutes, traveling at just 5 mph (8 kph) by the time it lands.

The stationary probe, launched in May from California, will then pause for 16 minutes for the dust to settle, literally, around its landing site, before disc-shaped solar panels are unfurled like wings to provide power to the spacecraft.

The mission control team at nasa's Jet Propulsion Laboratory (JPL) near Los Angeles hopes to receive real-time confirmation of the craft'S arrival from data relayed by a pair of miniature satellites that were launched along with InSight and will be flying past Mars.

The JPL controllers also expect to receive a photograph of the probe's new surroundings on the flat, smooth Martian plain near the planet's equator called the Elysium Planitia.

The site is roughly 373 miles (600 km) from the 2012 landing spot of the car-sized Mars rover Curiosity, the last spacecraft sent to the Red Planet by Nasa.

The smaller, 880-pound (360 kg) InSight – its name is short for Interior Exploration Using seismic Investigations, Geodesy and Heat Transport – marks the 21st US-launched Mars missions dating back to the Mariner fly-bys of the 1960s. Nearly two dozen others Mars missions have been sent from other nations.

InSight will spend 24 months – about one Martian year – using seismic monitoring and underground temperature readings to unlock mysteries about how Mars formed and, by extension, the origins of the Earth and other rocky planets of the inner solar system.

While Earth's tectonics and other forces have erased most of its early history, much of Mars – about one-third of the size of Earth – is believed to have remained largely static, creating a geologic time machine for scientists.

InSight's primary instrument is a French-built seismometer designed to record the slightest vibrations from "Marsquakes "and meteor impacts around the planet. The device, to be placed on the surface by the lander's robot arm, is so sensitive that it can measure a seismic wave just one half of the radius of a hydrogen atom.

Scientists expect to see a dozen to 100 Marsquakes during 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 Nasa Viking probes of the mid-1970s were also equipped with seismometers, but they were bolted to the top of the landers, a design that proved to be largely ineffective.

Apollo missions to the moon brought seismometers to the lunar surface as well. But InSight is expected to deliver the first meaningful data on planetary seismic tremors beyond Earth.

InSight is also equipped with a German-made drill to burrow as much as 16 feet (5 feet) underground, pulling behind it a rope-like thermal probe to measure heat flowing from inside the planet.

Meanwhile, the radio transmitter will send back signals tracking Mars'Subtle rotational wobble to reveal the size of the planet's core and possibly whether it remains molten.

Nasa officials say it will take two to three months for the main instruments to be deployed and put into operation.

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