So why go to all this effort to “touch” the Sun?

Scientists hope that as the spacecraft passes through our star’s outer atmosphere – its corona – it will solve a long standing mystery.

“The corona is really, really hot, and we have no idea why,” explains Dr Jenifer MIllard, an astronomer at Fifth Star Labs.

“The surface of the Sun is about 6,000C or so, but the corona, this tenuous outer atmosphere that you can see during solar eclipses, reaches millions of degrees – and that is further away from the Sun. So how is that atmosphere getting hotter?”

The mission should also help scientists to better understand solar wind – the constant stream of charged particles bursting out from the corona.

When these particles interact with the Earth’s magnetic field the sky lights up with dazzling auroras.

But this so called space weather can cause problems too, knocking out power-grids, electronics and communication systems.

“Understanding the Sun, its activity, space weather, the solar wind, is so important to our everyday lives on Earth,” says Dr Millard.