Hubble spots 'water vapour plumes' erupting from Jupiter's moon Europa
If shown to be real, the plumes are likely to originate from the global salty ocean known to lie beneath the moon's icy shell.
They could provide a golden opportunity to investigate the ocean - which many scientists believe has the potential to harbour life - without drilling through miles of ice.
Earlier, the American space agency Nasa sparked a frenzy of social media speculation about aliens after promising news of "surprising activity" on Europa.
Nasa eventually scotched the rumours with a tweet that read: " Monday, we'll announce new findings from Jupiter's moon Europa.... read more
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