Connect with us

Hi, what are you looking for?


Nasa seeks experiment ideas for Europa lander

The jovian satellite has a deep subsurface ocean beneath its ice crust and is considered one of the top targets in the search for alien life.

After decades of work, a pair of missions to the moon have been taking shape – and have secured crucial support in Congress.

Scientists hope the lander could be launched some time in the 2020s.

Although Nasa has yet to approve the mission, the agency said it had funding to begin the search for instrument ideas.

Europa: Our best shot at finding alien life?

“The possibility of placing a lander on the surface of this intriguing icy moon, touching and exploring a world that might harbour life is at the heart of the Europa lander mission,” said Thomas Zurbuchen, associate administrator for Nasa’s science mission directorate.

“We want the community to be prepared for this announcement of opportunity, because Nasa recognises the immense amount of work involved in preparing proposals for this potential future exploration.”

Europa lander conceptImage copyrightNASA/JPL-CALTECH
Image captionNasa’s Europa lander could determine whether there was or is life on the jovian moon

The announcement is intended to provide notice of a two-step competition for experiments. Science teams are expected to put together proposals which would be evaluated by experts working for Nasa.

About 10 proposals could be selected to go forward to the next stage.

Advertisement. Scroll to continue reading.

Last year, in response to a congressional directive, Nasa outlined its concept for how a landing mission would work.

The report calls for a four-legged lander that would hunt for evidence of microbial life on Europa’s surface. It would touch down with the help of the Sky Crane system used to deliver the Curiosity rover to Mars in 2012, but would use a much longer tether to minimise contamination of the Europan surface with rocket fuel.

The lander would carry some heritage from Nasa’s Phoenix lander, which touched down in Mars’ “arctic” in May 2008. That mission used a motorised cutting tool called a rasp to break up the hard, icy soil along with a scooper to retrieve the samples for analysis.

The Europa lander will carry a counter-rotating saw in addition to Phoenix’s flight-tested rasp and scoop. Scientists want to dig at least 10cm below the radiation-processed ice, but comparatively little is known about Europa’s surface properties.

Phoenix Rasp and ScoopImage copyrightNASA
Image captionThe Europa lander will carry technology with a heritage stretching back to Phoenix, which touched down in the Martian ‘arctic’ in 2008

With temperatures that dip to -170C, however, engineers have to prepare for the eventuality of steel-hard ice that resists Nasa’s best efforts to dig through.

However, scientists believe that if there is any life near the surface, they could detect it at concentrations of at least 100 microbial cells per cubic centimetre of ice. Although Europa’s icy outer shell is thought to be tens of kilometres thick, studying the surface could provide clues to what’s going on deep below.

Warm blobs of ice, or diapirs, could well up from the ocean-ice shell interface, eventually reaching the surface over thousands of years – carrying any evidence of microbial life with them.

Earlier this year, Nasa programme scientist Curt Niebur told me: “The lander is all about hitting the freshest, most pristine sample possible. One way to do that is to dig deep, another way is going to where there is some kind of eruption on the surface – like a plume – that’s dropping very fresh material onto the surface.”

The Hubble telescope has provided tentative evidence for geysers that spew ice out into space from deep beneath Europa’s surface.

The lander would follow several years after a flyby mission called Europa Clipper, which is scheduled to launch in the early 2020s.

Advertisement. Scroll to continue reading.


You May Also Like


Professing to be the lead in Thai relationship with over 1.5 million enrolled single people, Cupid Media’s ThaiCupid brings the one in every of...


An exclusive article form Orestis Karipis In the 1930’s and 1940’s acid was the weapon of deceived husbands and wives in the Western world...


Read more about switzerland women here. Swiss ladies and men are not reknown for being the most chatty, outgoing or spontaneous when meeting strangers...


In food, if there is one thing you can say without fear of contradiction, it is this: Britain loves burgers. The UK market is...

Copyright © 2020 All Rights Reserved