MessageToEagle.com - Most of what scientists know of Jupiter's moon Europa they have gleaned from a
dozen or so close flybys from NASA's Voyager 2 spacecraft in 1979 and NASA's Galileo spacecraft in the mid-to-late
Even in these fleeting, paparazzi-like encounters, scientists have seen a fractured, ice-covered world with
tantalizing signs of a liquid water ocean under its surface.
Such an environment could potentially be a hospitable home for microbial life.
Click on image to enlarge
Simulated View from Europa's Surface (Artist's Concept)
This artist's concept shows a simulated view from the surface of Jupiter's moon Europa. Europa's potentially rough, icy surface,
tinged with reddish areas that scientists hope to learn more about, can be seen in the foreground. The giant planet Jupiter looms over the horizon.
Image credit: NASA/JPL-Caltech
But what if we got to land on Europa's surface and conduct something along the lines of a more in-depth
interview? What would scientists ask?
"If one day humans send a robotic lander to the surface of Europa, we need to know what to look for and what
tools it should carry," said Robert Pappalardo, the study's lead author, based at NASA's Jet Propulsion Laboratory,
"There is still a lot of preparation that is needed before we could land on Europa, but studies like these
will help us focus on the technologies required to get us there, and on the data needed to help us scout out
possible landing locations.
Europa is the most likely place in our solar system beyond Earth to have life today,
and a landed mission would be the best way to search for signs of life."
The paper was authored by scientists from a number of other NASA centers and universities, including the Johns
Hopkins University Applied Physics Laboratory, Laurel, Md.; University of Colorado, Boulder; University of Texas,
Austin; and the NASA Goddard Space Flight Center, Greenbelt, Md.
Click on image to enlarge
Repeated Flybys Yield a Pole-to-Pole View of Europa
This view of Jupiter's moon Europa features several regional-resolution mosaics
overlaid on a lower resolution global view for context. Image Credit: NASA/JPL-Caltech/University of Arizona
The team found the most important questions clustered around composition: what makes up the reddish "freckles"
and reddish cracks that stain the icy surface? What kind of chemistry is occurring there?
Are there organic molecules, which are among the building blocks of life?
Additional priorities involved improving our images of Europa - getting a look around at features on a human
scale to provide context for the compositional measurements. Also among the top priorities were questions
related to geological activity and the presence of liquid water: how active is the surface?
How much rumbling is there from the periodic gravitational squeezes from its planetary host, the giant planet Jupiter?
What do these detections tell us about the characteristics of liquid water below the icy surface?
"Landing on the surface of Europa would be a key step in the astrobiological investigation of that world," said
Chris McKay, a senior editor of the journal Astrobiology, who is based at NASA Ames Research Center, Moffett Field,
"This paper outlines the science that could be done on such a lander. The hope would be that surface materials,
possibly near the linear crack features, include biomarkers carried up from the ocean."