Enceladus: Too Young for Life?

Does life exist on Enceladus? Maybe. I don’t know. It depends.

Ap05 Enceladian Jellyfish 1

Calm down, Enceladian jellyfish thing. We’re still trying to figure this out.

Astronomers recently determined that Enceladus has a decoupled crust, meaning there is a global ocean of liquid water hidden beneath this tiny moon’s surface. Just the kind of environment that could support alien life. But there’s a problem.

A recent scientific paper, entitled “Dynamical Evidence for a Late Formation of Saturn’s Moons,” suggests that Enceladus may be too young for life to have evolved there. (Please note: I typically try to read these sorts of papers in their entirety, but this one is 50 pages long. I think I got the gist of it, but I cannot honestly say I read the whole thing).

After examining tidal forces, orbital resonances, and orbital inclinations within the Saturnian system, the paper reaches two possible conclusions:

  • Either the Saturnian system changes at an oddly slow rate…
  • Or Saturn’s rings and many of its moons—including Enceladus—formed very, very recently.

If you were a dinosaur, specifically a dinosaur who knew how to use a telescope, you may have been able to watch as a previous generation of Saturn’s moons were destroyed. Perhaps these moons collided with each other. Perhaps they were torn asunder by Saturn’s gravity. Perhaps you would have wondered, with your walnut-sized dinosaur brain, if anything like that could ever happen to Earth.

Anyway, the destruction of Saturn’s old moons left a whole lot of debris, forming a disk of icy and rocky material around the planet. Much of that debris is still there in the rings, but some of it accreted together, forming new moons like Enceladus.

All of this happened, according to this “Dynamical Evidence” paper, about 100 million years ago. That doesn’t give life a whole lot of time to evolve, which is bad news for out Enceladian jellyfish friend.

Ap05 Enceladian Jellyfish 2

Sorry, buddy.

3 Responses to Enceladus: Too Young for Life?

  1. Interesting. I’ve read that the rings might have formed after one or more moons broke up, so it makes sense that new moons might have formed since then.

    An age of 100 million years would definitely rule out complex life. But it might not rule out simple microscopic life. Indeed, if we found such life, it might tell us a lot about early life on Earth. (We’d have to be extremely cautious with such life since it might be extremely vulnerable to contamination containing any of Earth’s more evolved microbes.)

    Liked by 1 person

  2. […] interest to astrobiologists. Its subsurface ocean would be an ideal environment for life, but as I said last week, that’s only if life has had sufficient time to evolve. 100 million years doesn’t give […]

    Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: