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L4 to Enceladus
Exploring the habitability of Saturn’s Icy Moons
Launch

2042

status

Future

destination

Enceladus

type

Planetary explorer

ESA’s L4 mission is under study to land on Saturn’s ocean moon Enceladus. It is the Agency’s fourth ‘Large-class’ mission and the first flagship mission of Voyage 2050. This ambitious mission aims to sample the plumes that burst out from beneath Enceladus’s icy crust, and perform in-situ measurements directly from the surface, seeking out the ingredients that could fuel life. The orbiter will also perform flybys around Saturn’s other moons, to better understand the conditions needed for habitable worlds.
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a unique mission
What makes **L4** unique?

A unique moon requires a unique mission to investigate it. Enceladus is one of the few locations in the Solar System where samples from its buried oceans are sprayed out into space in towering plumes. The L4 mission aims to sample this pristine water directly – perhaps the plumes will carry biosignatures straight to our instruments.


Touching down on Enceladus, onto a landscape unlike anything seen before, will be both thrilling and technically demanding. Furthermore, the task of lifting such a heavy spacecraft into space represents one of the mission’s greatest challenges. With Europe’s determination and innovative mindset, a massive leap forward will be taken in exploring the riches of the Solar System on the quest to find life beyond Earth.

Enceladus's blue plumes, craters and complex, fractured terrains. Credit: NASA/ESA/JPL/SSI/Cassini Imaging Team. 

science questions
What questions are we addressing?

We want to uncover the secrets of Enceladus by addressing key questions regarding its surface, subsurface and external environment:

Explore ocean composition and core dynamics:
What is the composition of the subsurface ocean and how does it interact with the moon’s core?

Search for prebiotic chemistry and biosignatures:
Is there evidence of prebiotic molecules or signs of life in the subsurface or surface materials?

Assess external impacts on habitability: 
How does the external environment, including radiation and tidal forces, affect the potential for life?

method & instruments
A technological challenge

Two Ariane 6 rockets will be required to launch the heavy spacecraft stack into space, with an in-orbit assembly close to Earth.

Infographic of the L4 mission to Enceladus concept. Credit: ESA.

scientific context

The L4 mission to Enceladus builds on the legacy of Cassini-Huygens. In 2005, ESA’s Huygens probe made history when it descended to the surface of Saturn’s moon Titan, becoming the first probe to successfully land on another world in the outer Solar System. Now, as the first flagship mission of ESA’s Voyage 2050 programme, L4 will take the next bold step, deepening our search for life in Saturn's icy ocean worlds.

building the mission
**L4** will be a fully European mission, built and operated by ESA.
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3D model of Enceladus' environment, showing the icy moon's plumes. Credit: ESA. 

did you know?
Recreating Enceladus's frozen surface

Among all the challenges of this mission, landing on Enceladus is certainly the greatest. Our team is working hard to understand the features of this frozen icy surface, which is unlike anything we know. The model in this picture, displayed at the ESTEC Open Day, was reconstructed using Cassini-Huygens images. It shows part of a characteristic canyon and active region near Enceladus's south pole. It was built both as a way for engineers to better comprehend the local environment, and to give our visitors a chance to dream a little!

more about L4
Keep exploring the mission's science
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more about space science
Discover our science missions

Explore a subset of the ESA Science Programme missions here. Additional mission pages are in progress.
The currently available mission pages are ESA's flagship missions launched from 2013 and to be launched (L-class), and the ones in development (M- and F-class).

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