A British-built spacecraft is set to blast off from Earth bound for Mercury, the scorching planet closest to the sun.

BepiColombo, the European Space Agency's (Esa) first mission to Mercury, will send two probes to explore the planet where surface temperatures reach 450C.

The four-tonne spacecraft will be launched into orbit by Esa's rocket Ariane 5 from the European spaceport at Kourou, French Guiana, on 20 October.

It will then make a 5.2bn mile (8.5bn km) journey over seven years to reach its destination by 2025.

Image: NASA's Messenger probe orbited Mercury from 2011 to 2015, taking photos of the surface

The spacecraft will then deploy the Mercury Planetary Orbiter (MPO), built by satellite-maker Airbus Space and Defence at its assembly centre in Stevenage, Herts, to study Mercury's surface and composition.

The second probe, the Japanese Mercury Magnetospheric Orbiter (MMO), constructed in Japan, will focus on the electromagnetic environment surrounding the planet.

A key instrument on the MPO, the Mercury Imaging X-ray Spectrometer (Mixs), was developed and built at Leicester University.

The 13kg (28lb) metre-long device consists of two X-ray telescopes, one designed to capture images of the surface and the other to analyse its composition.

Artist's impression of the BepiColombo in 'cruise mode' on its way to Mercury
Image: How BepiColombo is expected to look in 'cruise mode' on its way to Mercury

Mercury is bombarded by high energy sub-atomic particles from the sun, causing the surface to "fluoresce" and emit X-rays. Analysing the rays provides information about what the planet is made of.

Mixs scientist Professor Emma Bunce said: "We want to understand how the solar system works and how it was formed.

"Mercury is a place of extremes; a small planet and the planet closest to the sun. Knowing how it has survived will help us piece together a bigger picture of the solar system and our place in it."

Unlike any other interplanetary spacecraft in history, BepiColombo carries a futuristic ion electric propulsion drive, also designed and built in the UK.

Four ion engines supplied by British defence and technology company QinetiQ have been fitted to the craft's power unit, the Mercury Transfer Module (MTM).

They work by "ionising" inert xenon gas – knocking an electron off the gas atoms to give them a positive charge.

The resulting "plasma" is attracted by electrostatic forces to a grid with an opposite negative charge and fired out of the thruster at 90,000mph.

Mission controllers at the European Space Operations Centre in Darmstadt, Germany, as they prepare for the BepiColombo launch
Image: Mission controllers at the European Space Operations Centre in Darmstadt, Germany, prepare for BepiColombo's launch

Unusually, the spacecraft will use energy not to speed up but to put the brakes on as it "falls" towards the sun.

It will achieve this both by firing the ion thrusters in the direction of travel, and by means of a complex series of "gravity-assist" fly-bys past Earth, Venus and Mercury.

Dr Jerry Bolter, project manager at Airbus Defence and Space where the MTM was assembled, said: "We recognised very early on that for BepiColumbo to do what we wanted it to do and get from here to Mercury we needed to have a very efficient propulsion system. If we relied on chemical propulsion then we'd need 17 tonnes of propellant.

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"The ion drive needs just 581 kilograms of propellant and does the equivalent of 17.8 million miles to the gallon."

Only two spacecraft have previously visited Mercury. NASA's Mariner 10 flew past the planet three times in 1974-75, and the American space agency's Messenger probe orbited Mercury from 2011 to 2015, taking photos of the surface.

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