Nasa has announced plans to launch another mission to Mars, hot on the heels of the successful landing of its Curiosity rover.
The InSight lander will set out to discover how Mars was formed, which scientists say will give them a better understanding of how rocky bodies like the Earth were created.
While the car-sized Curiosity is looking for habitats where microbial life could thrive on the Red Planet, the new, smaller, probe will focus on what is happening deep inside the planet's core.
InSight is solar-powered and will carry a German-built drill that can penetrate nine metres into the Martian crust.
A French-built seismometer will record quakes and tremors and a thermometer will measure how much heat is coming from the planet's core.
"Seismology is the standard method by which we've learned to understand the interior of the Earth and we have no such knowledge for Mars," said John Grunsfeld, Nasa's associate administrator for science.
"This is something that has interested the scientific community for many years."
The mission launches in 2016 and competed against two other projects for \$425m (£270m) of Nasa funding - one to explore a liquid methane lake on Titan, the other to measure how sunlight affects comets.
Nasa's jet propulsion laboratory in Pasadena, California, which is overseeing the Curiosity mission, will lead InSight, which stands for Interior exploration using Seismic Investigations, Geodesy and Heat Transport.
The lander will be designed to last two years.