// BBC WORLD NEWS — MONDO
Mission blasts off for Mars to grab a piece of its moon
Watch: Spacecraft heading to Mars' moon Phobos lifts off from Japan
A spacecraft has launched from Japan headed for Mars' moon Phobos, where it will attempt to grab some moondust and bring it back to Earth.
If it is successful, this will become the first time a sample has been returned from Mars or its moons to be analysed in laboratories here on Earth.
The spacecraft is scheduled to arrive at Phobos in August 2027.
It is hoped that the Mars Moons Exploration (MMX) mission, which is led by the Japanese Space Agency, will solve the mystery of how Mars's moons formed.
Prof Sara Russell, from the Natural History Museum, who is the MMX mission's deputy for sample analysis, said: "There hasn't yet been a successful mission to go to Phobos and bring a bit back to Earth.
"I think this is an incredibly ambitious and fun mission," she said.
There are only three moons in the inner Solar System: our own Moon, and two around Mars, which are called Phobos and Deimos.
Both of these are tiny - Phobos is about 20km (12 miles) across and Deimos is about 10km (six miles) across. They are also irregularly shaped, looking a bit like space potatoes.
The MMX spacecraft will study Deimos as it arrives in the Mars neighbourhood, and then will focus on Phobos.