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NASA's Psyche asteroid mission: A 3.6 billion kilometer 'journey to the center of the Earth'

Psyche was the Greek goddess of the soul, born a mere mortal and later married to Eros, the God of love. Who knows why the Italian astronomer Annibale de Gasparis gave her name to a celestial object he observed one night in 1852?
Psyche was only the 16th "asteroid" ever discovered: inhabitants of the solar system that were neither the familiar planets nor the occasional visitors known as comets. Today we know the asteroid belt between the orbits of Mars and Jupiter contains millions of space rocks, ranging in size from the dwarf planet Ceres down to tiny pebbles and grains of dust.
Among all these, Psyche is still special. With an average diameter of around 226km, the potato-shaped planetoid is the largest "M-type" asteroid, made largely of iron and nickel, much like Earth's core.
Last week NASA launched a spacecraft to rendezvous with Psyche. The mission will take a six-year, 3.6 billion kilometer journey to gather clues that Earth scientists like me will interrogate for information about the inaccessible interior of our own world.
How NASA's Europa Clipper will survive its trip to Jupiter's hostile moon

If life exists elsewhere in the solar system, it may well reside in the ocean of Jupiter's icy moon Europa.
The mysterious world appears to have the necessary ingredients for life as we know it. Beneath its frozen exterior is a single body of water that's so deep it may hold more liquid than all of the oceans on Earth. Europa is believed to have enough carbon, hydrogen, nitrogen, oxygen and other key elements to form the building blocks of living organisms. And scientists suspect the heat generated as the moon is stretched and squeezed by Jupiter's gravity would provide enough energy to sustain any creatures that might be there.
That's why NASA is building Europa Clipper.
The spacecraft will blast off from the Kennedy Space Center in Florida a year from now and reach its destination in 2030.