Astronomy
The Geysers of Enceladus: Sampling a Subsurface Ocean
Quick fact
Cassini flew through Enceladus' geysers and sampled water vapor, ice grains, and organic molecules—directly revealing the chemistry of its subsurface ocean without ever landing.
Why this is interesting
There's a world with an ocean hidden beneath a thick shell of ice—yet water from that ocean is shooting into space. Could we taste it without landing?