Language Selection

English French German Italian Portuguese Spanish

Has Huygens found life on Titan?

Submitted by srlinuxx on Sunday 24th of July 2005 12:20:21 AM Filed under
Sci/Tech

IF LIFE exists on Titan, Saturn's biggest moon, we could soon know about it - as long as it's the methane-spewing variety. The chemical signature of microbial life could be hidden in readings taken by the European Space Agency's Huygens probe when it landed on Titan in January.

Titan's atmosphere is about 5 per cent methane, and Chris McKay of NASA's Ames Research Center in Moffet Field, California, thinks that some of it could be coming from methanogens, or methane-producing microbes. Now he and Heather Smith of the International Space University in Strasbourg, France, have worked out the likely diet of such organisms on Titan.

They think the microbes would breathe hydrogen rather than oxygen, and eat organic molecules drifting down from the upper atmosphere. They considered three available substances: acetylene, ethane and more complex organic gunk known as tholins. Ethane and tholins turn out to provide little more than the minimum energy requirements of methanogenic bacteria on Earth. The more tempting high-calorie option is acetylene, yielding six times as much energy per mole as either ethane or tholins.

McKay and Smith calculate that if methanogens are thriving on Titan, their breathing would deplete hydrogen levels near the surface to one-thousandth that of the rest of the atmosphere. Detecting this difference would be striking evidence for life, because no known non-biological process on Titan could affect hydrogen concentrations as much.

One hope for testing their idea rests with the data from an instrument on Huygens called the GCMS, which recorded Titan's chemical make-up as the probe descended. It will take time to analyse the raw data, partly because hydrogen's signal will have to be separated from those of other molecules. "Eventually, I hope, we will have numbers for at least upper limits for hydrogen," says Hasso Niemann of Goddard Space Flight Center in Maryland, principal investigator of the GCMS.

Acetylene could be easier to analyse, McKay says, and it too might betray life. "I would guess that there would be a similar fall-off of acetylene if the microbes are eating it." The work is to be published in the journal Icarus.

By Stephen Battersby
NewScientistSpace.com.

»

More in Tux Machines

Android Leftovers

  • 1B Android phones shipped in 2014, but they don’t all help Google
    When Android first arrived in 2007, it was (and still is) a key part of the OHA, or Open-Handset Alliance. OHA partners — which include Samsung, LG, Dell, HTC, Huawei and ZTE, to name a few — all loosely work together to help improve Android, while competing against one another by using Android on their respective hardware products. Android is the commonality between all of the OHA partners. And then there’s Google.
  • Android beats iOS for app downloads, but revenues are still a different story
    There are plenty of caveats to this line of reasoning, though. First, Google Play is not the only Android app store – Amazon and Samsung run their own stores, while in countries like China there are dozens of stores offering Android apps.
  • HTC One M8 Android 5.0 Lollipop Update: What U.S. Owners Can Expect
    When Google announced Android 5.0 Lollipop back in October many smartphone owners like those with the HTC One or HTC One M8 instantly started waiting for details regarding the Android 5.0 Lollipop update. It has arrived for a few devices already, including the HTC One and HTC One M8 Google Play Edition handsets, but below we’ll go over what regular HTC One owners need to know about the Android 5.0 update.
  • Samsung Galaxy S4 Updated To The Android Lollipop 5.0 OS
    The Android Lollipop 5.0 update is finally available for the Samsung S4. The operating system is also available for the Samsung Galaxy S5, Note 4, Note 3, and Note Edge. Samsung Galaxy and Note users will be happy to hear that the long waited update is coming in the near future. But should Galaxy S4 users take advantage of the Android Lollipop update?
  • Don’t wait for Android 5.0, this app makes your phone look like Lollipop for free
    Android 5.0 Lollipop is a huge upgrade for Google’s mobile operating system. The only problem with it, of course, is that it’s only available for a handful of devices. Most Android smartphone users still have plenty more waiting to do before Lollipop is finally available for their handset, but now there’s a terrific app that will make your older version of Android look just like Lollipop — and it’s free!
  • Is this Apple’s secret weapon that could force Android users to buy an iPhone?
    There are many reasons why Android users switch to iPhone, and vice-versa, but Apple may have a secret (or not-so-secret) weapon that could pressure some Android fans to considering a move to the other side. No, it’s not Apple Pay, an exclusive iPhone 6 feature that’s heavily marketed by various banks in the U.S., further helping Apple market its 2014 iPhones. It’s actually a stock iOS app that has been hiding in plain sight for years.
  • Android 5.0.2 Lollipop Problems Frustrating Nexus Users
    Google rolled out its Android 5.0.2 Lollipop update to fix Nexus Lollipop problems. And while it did fix some of the bigger issues, Android 5.0.2 Lollipop problems continue to frustrate Nexus users.

Libreboot X200 laptop now FSF-certified to respect your freedom

This is the second Libreboot laptop from Gluglug (a project of Minifree, Ltd.) to achieve RYF certification, the first being the Libreboot X60 in December 2013. The Libreboot X200 offers many improvements over the Libreboot X60, including a faster CPU, faster graphics, 64-bit GNU/Linux support (on all models), support for more RAM, higher screen resolution, and more. The Libreboot X200 can be purchased from Gluglug at http://shop.gluglug.org.uk/product/libreboot-x200/. Read more

Ubuntu 15.04 Now Based on Linux Kernel 3.18.4, Devs Are Tracking the 3.19 Branch

A new Linux kernel has been made available for Ubuntu 15.04 (Vivid Vervet) and the developers are also tracking the current 3.19 branch of the kernel, which will eventually be adopted after it reaches a stable state. Read more

Ubuntu Users See Private, Hybrid Cloud Expansion

Canonical, the company behind the open source cross-platform operating system Ubuntu, released its annual cloud and server survey this week that seeks to cast more light on the makeup of cloud infrastructure, how it is managed, and what is driving cloud adoption. Canonical said it surveyed 3,100 customers, most of whom are Ubuntu server and cloud users, about the makeup of their cloud infrastructure and how it is being used. Read more

More on Tux Machines: About ● Gallery ● Forum ● Blogs ● Search ● News ● RSS Feed

Part of Bytes Media ● Sister sites below.

TechBytes Techrights button

Powered by Drupal, an open source content management system

Content available under CC-BY-SA CC

© by original authors

Powered by CentOS 6.5 (GNU/Linux), Varnish, and Drupal 6