NASA is poised to launch its first lander to Mars since 2012, an unmanned spacecraft called InSight that aims to listen for quakes and unravel the mystery of how rocky planets like Earth form.
Since the Earth and Mars likely formed by similar processes 4.5 billion years ago, the US space agency hopes the lander -- officially known as Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) -- will shed light on what made them so different.
"How we get from a ball of featureless rock into a planet that may or may not support life is a key question in planetary science," said Bruce Banerdt, InSight principal investigator at NASA's Jet Propulsion Laboratory in Pasadena, California.
"We'd like to be able to understand what happened." On Earth, these processes have been obscured over billions of years by earthquakes and the movement of molten rock in the mantle, he said.
But Mars, the fourth planet from the Sun and Earth's smaller and less geologically active neighbour, may yield more clues.
The lander will gather information using three instruments: a French-made seismometer, a device to help scientists on Earth keep precise track of the lander's location as Mars rotates, and a self-hammering probe that will monitor the flow of heat in the planet's subsurface.
The lander aims to rest in an isolated spot and detect "marsquakes," which NASA described as "like a flashbulb that illuminates the structure of the planet's interior."
Scientist expect to pick up as many as 100 quakes during the mission. Most are expected to be less than 6.0 on the Richter scale.
Studying how seismic waves pass through the crust, mantle and core of Mars can help scientists learn more about what the layers are made of and how deep they are.
The Seismic Experiment for Interior Structure was made by the French Space Agency.
The heat probe, called the Heat Flow and Physical Properties Package, was made by the German Space Agency, with the participation of the Polish Space Agency.
NASA's pair of Viking landers in the late 1970s had seismometers but only one of them worked. It was much less sensitive because it was bolted on top of the spacecraft.
In contrast, InSight's seismometer will be picked up with a robotic arm and placed directly on the ground.
InSight aims to be the first NASA instrument to land on Mars since the Curiosity rover which arrived in 2012 and is still working.
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