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" ... Launched in 2009, Kepler discovered thousands of planets orbiting distant stars by watching for the faint dimming of a star's light that happens when a planet passes between the star and our solar system. Nearly a decade later, Kepler has run out of the hydrazine monopropellant that helps keep the spacecraft pointing in the right direction against the pressure of solar radiation. ... "
" ... NASA’s Dawn spacecraft gave us our first close look at the largest objects in the asteroid belt, the protoplanet Vesta and the dwarf planet Ceres. Its thrusters use electricity to accelerate ions out the back end of the spacecraft, and those ion thrusters let Dawn stretch its fuel supply enough to actually orbit Vesta and Ceres instead of just flying past them at close range. But it also used more conventional hydrazine thrusters for fine maneuvers, and their fuel eventually ran out – leaving Dawn dead in orbit around Ceres. ... "