The vast space between the planets, moons and stars hold trillions of specks of dust. These grains are few and far between. And they are too small to see with the naked eye. But they are fast. They shoot through space as quickly as 400 kilometers (250 miles) per second. That’s hundreds of times faster than a bullet. Importantly, they hold lots of information about places far, far away.
That's why Sascha Kempf grew excited when a NASA space probe named Cassini ran into clouds of dust as it
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