Enceladus sprays anew!

Bad Astronomy
The entire universe in blog form
Dec. 1 2010 4:22 PM

Enceladus sprays anew!

This picture of Saturn's icy moon Enceladus just came down from the spacecraft yesterday, and is very cool:


Phil Plait Phil Plait

Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death From the Skies!  


[Click to engeysernate.]

First, this is a raw image, which means there has been no processing on it. It's uncalibrated and uncleaned, straight from the spacecraft. So some of the bright specks in it are not real, but probably things like cosmic ray hits on the detector.

But what a picture! Enceladus has a string of water geysers erupting from its south pole region, and usually they are seen individually. But this view shows them all blending together, as if a sheet of ice is spraying out of the tiny moon!

Even cooler, look just above the limb of the moon to the left: I can't be totally positive, but I think that grayish crescent is the shadow of the moon falling across the spray! The angle looks right; from the thin brightly lit crescent on the right (the part of the moon we can see that's in direct sunlight), you can tell the spacecraft is looking nearly straight down on the dark side of the moon (the faintly lit right half of the moon is probably due to reflected light from Saturn itself). The Sun is lighting up the plumes, and the shadow of the moon's edge would fall pretty much where we're seeing it.

If so, well, wow! Very pretty. Well, it's pretty anyway, but a big part of my brain goes ping! when I understand what I'm seeing in these pictures. That's not as often as I'd like -- Saturn is really, really weird -- but still, the fact that we can take pictures in situ from a billion kilometers or more away is also enough to make all kinds of regions of my brain light up.

Image credit: NASA/JPL/Space Science Institute. Tip o' the Old Faithful to, as usual, Carolyn Porco.

Related posts:


The World

How Canada’s Shooting Tragedies Have Shaped Its Gun Control Politics

Where Ebola Lives Between Outbreaks

Gunman Killed Inside Canadian Parliament; Soldier Shot at National Monument Dies

Sleater-Kinney Was Once America’s Best Rock Band

Can it be again?

Paul Farmer: Up to 90 Percent of Ebola Patients Should Survive

Is he right?


“I’m Not a Scientist” Is No Excuse

Politicians brag about their ignorance while making ignorant decisions.


Driving in Circles

The autonomous Google car may never actually happen.

In Praise of 13th Grade: Why a Fifth Year of High School Is a Great Idea 

PowerPoint Is the Worst, and Now It’s the Latest Way to Hack Into Your Computer

  News & Politics
Oct. 22 2014 9:42 PM Landslide Landrieu Can the Louisiana Democrat use the powers of incumbency to save herself one more time?
Continuously Operating
Oct. 22 2014 2:38 PM Crack Open an Old One A highly unscientific evaluation of Germany’s oldest breweries.
Gentleman Scholar
Oct. 22 2014 5:54 PM May I Offer to Sharpen My Friends’ Knives? Or would that be rude?
  Double X
The XX Factor
Oct. 22 2014 4:27 PM Three Ways Your Text Messages Change After You Get Married
  Slate Plus
Tv Club
Oct. 22 2014 5:27 PM The Slate Walking Dead Podcast A spoiler-filled discussion of Episodes 1 and 2.
Brow Beat
Oct. 22 2014 10:39 PM Avengers: Age of Ultron Looks Like a Fun, Sprawling, and Extremely Satisfying Sequel
Future Tense
Oct. 22 2014 5:33 PM One More Reason Not to Use PowerPoint: It’s The Gateway for a Serious Windows Vulnerability
  Health & Science
Wild Things
Oct. 22 2014 2:42 PM Orcas, Via Drone, for the First Time Ever
Sports Nut
Oct. 20 2014 5:09 PM Keepaway, on Three. Ready—Break! On his record-breaking touchdown pass, Peyton Manning couldn’t even leave the celebration to chance.