Officials said geomagnetic activity is likely to increase with the arrival of an Earth-directed coronal mass ejection.
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Mars was a blue planet around three billion years ago, according to new research.
Scientists say the unusual formation is the result of a meteorite impact.
Enceladus is Saturn's sixth-largest moon, a 500 km-wide icy world famed for its south polar geysers spewing water from a subsurface ocean.
Eight "skylights" may be entrances to underground spaces where evidence of ancient microbial organisms could be found.
Scientists have described the find as "a new freckle on the face of the moon."
Analysis of the data reveals magnetic fields speeding toward the pole much faster than expected
The study found that near-surface winds can reach up to 160 kilometers per hour.
Both caves found connect to underground cave networks that which could provide natural shelter.