4.63 billion: Number of miles traveled by NASA’s Stardust comet sampler from Earth to the comet and back to Earth

28,860 mph: Velocity of return capsule as it enters Earth’s atmosphere, the fastest re-entry of a spacecraft ever

100: Estimated weight, in pounds, of return capsule

One-third millimeter: Expected maximum size of the comet dust particles being returned Sunday for study

$168.4 million: Cost of the mission, not including the launch vehicle

Source: NASA