Nasa to launch InSight probe to look for life under Mars' surface

Beyond the safety of Earth, robots are paving the way for human exploration of the solar system, reaching out to sniff atmospheres and taste alien soils. For many of these, the target in their sights is Mars, leading the way for a manned mission to the planet. Now planetary scientists are looking to one of these robotic explorers to help them unlock the secrets hidden in Mars' rocky interior - by listening to how it'rings' when it is hit by meteorites or its interior rumbles. They hope the research could reveal more about how the rocky planets in our solar system formed, and reveal whether life is hiding beneath the surface. Nasa's InSight mission was due to launch earlier this year but was delayed after a leak was detected.