Europe, Japan Send Spacecraft on 7-Year Long Journey to Mercury - NBC New York
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Europe, Japan Send Spacecraft on 7-Year Long Journey to Mercury

BepiColombo will release two probes — Bepi and Mio — that will independently investigate the surface and magnetic field of Mercury

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    Europe, Japan Send Spacecraft on 7-Year Long Journey to Mercury
    AFP/Getty Images/Jody Amiet
    An Ariane 5 lifts off from its launch pad in Kourou, at the European Space Center in French Guiana, on Oct 19, 2018. The European Space Agency's first mission to Mercury blasts off with a trio of craft heading to the planet closest to the Sun.

    European and Japanese space agencies said an Ariane 5 rocket successfully lifted a spacecraft carrying two probes into orbit Saturday for a joint mission to Mercury, the closest planet to the sun.

    The European Space Agency and the Japan Aerospace Exploration Agency said the unmanned BepiColombo spacecraft successfully separated and was sent into orbit from French Guiana as planned to begin a seven-year journey to Mercury.

    They said the spacecraft, named after Italian scientist Giuseppe "Bepi" Colombo, was in the right orbit and has sent the first signal after the liftoff.

    ESA says the 1.3 billion-euro ($1.5 billion) mission is one of the most challenging in its history. Mercury's extreme temperatures, the intense gravity pull of the sun and blistering solar radiation make for hellish conditions.

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    The BepiColombo spacecraft will have to follow an elliptical path that involves a fly-by of Earth, two of Venus and six of Mercury itself so it can slow down before arriving at its destination in December 2025.

    When it arrives, BepiColombo will release two probes — Bepi and Mio — that will independently investigate the surface and magnetic field of Mercury. The probes are designed to cope with temperatures varying from 430 degrees Celsius (806 F) on the side facing the sun, and -180 degrees Celsius (-292 F) in Mercury's shadow.

    The ESA-developed Bepi will operate in Mercury's inner orbit, and JAXA's Mio will be in the outer orbit to gather data that would reveal the internal structure of the planet, its surface and geological evolution.

    Scientists hope to build on the insights gained by NASA's Messenger probe, which ended its mission in 2015 after a four-year orbit of Mercury. The only other spacecraft to visit Mercury was NASA's Mariner 10 that flew past the planet in the mid-1970s.

    Mercury, which is only slightly larger than Earth's moon, has a massive iron core about which little is known. Researchers are also hoping to learn more about the formation of the solar system from the data gathered by the BepiColombo mission.

    "Beyond completing the challenging journey, this mission will return a huge bounty of science," said Jan Wörner, ESA Director General, in a statement.

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    JAXA President Hiroshi Yamakawa, who earlier managed the project, said, "We have high expectations that the ensuing detailed observations of Mercury will help us better understand the environment of the planet, and ultimately, the origin of the Solar System including that of Earth."

    It is the second recent cooperation between the Europeans and the Japan Aerospace Exploration Agency. JAXA's Hayabusa2 probe dropped a German-French rover on the asteroid Ryugu earlier this month.