Launched two years ago today, the European Space Agencys Hera mission for planetary defence has been hurtling away from Earth ever since. The small-car-sized spacecraft is now preparing for its single most challenging activity since lift-off: the sustained braking manoeuvres to slow it down to approach its target asteroids.
Launched two years ago today, the European Space Agencys Hera mission for planetary defence has been hurtling away from Earth ever since. The small-car-sized spacecraft is now preparing for its single most challenging activity since lift-off: the sustained braking manoeuvres to slow it down to approach its target asteroids.
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