On Friday, after almost 20 years of amazing pictures and great science, the Cassini spacecraft will be intentionally crashed into Saturn. The probe, which is almost out of fuel, is being intentionally destroyed to ensure that it does not cause biological contamination of Titan or Enceladus.
Thanks to Cassini, we know a lot more about the Saturn "sub system" than we did when it was launched back in 1997....which makes me feel old. But all good things must come to an end and spaceships can only carry so much fuel. (Of course, some future probes may fly out using a solar sail...much more efficient!).
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