Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Possible Lake Discovery on Titan

  • 29-06-2005 10:17am
    #1
    dudara
    Registered Users, Registered Users 2 Posts: 33,518 ✭✭✭✭


    From the BBC
    Titan dark spot may be large lake

    A dark, lake-like feature on Saturn's largest moon, Titan, has been imaged by the US-European Cassini spacecraft.

    Researchers have long speculated that Titan might harbour open bodies of liquid methane - and the 235km by 75km target is the best candidate to date.

    But they are being cautious about interpreting the feature that has what looks to be a smooth shoreline.

    The scientists say the object could simply be dark, solid deposits caught in a sinkhole of volcanic caldera.

    "This feature is unique in our exploration of Titan so far," said Dr Elizabeth Turtle, Cassini imaging team member at the University of Arizona, US.

    "Its perimeter is intriguingly reminiscent of the shorelines of lakes on Earth that are smoothed by water erosion and deposition," she added.

    The feature lies in Titan's cloudiest region, towards the south pole, which is presumably the most likely site of recent methane rainfall.

    This, coupled with the shore-like smoothness of the feature's perimeter makes it hard for scientists to resist speculation about what might be filling the lake, if it indeed is one.

    Evidence building

    "An alternate explanation is that this feature was once a lake, but has since dried up, leaving behind dark deposits," Dr Turtle said.

    Despite earlier predictions, no definitive evidence for open bodies of liquid has been found on Titan. Cassini has not yet been in a favourable position for using its cameras to check for glints from possible surface liquids in the south polar region.

    Thirty-nine more Titan flybys are planned for Cassini's prime mission.

    In future flybys, the science teams will search for opportunities to observe the lake feature again and to look for mirror-like reflections from smooth surfaces elsewhere on Titan.

    Such reflections would strongly support the presence of liquids.

    Cassini's Titan probe, Huygens, sent back images on its descent to the surface of the moon of channels and gullies that looked very similar to the liquid-cut features seen on Earth.

    The Cassini-Huygens mission is a cooperative venture of the US space agency (Nasa), the European Space Agency (Esa) and the Italian Space Agency.


Advertisement