Looking up to Saturn

Looking up to Saturn

Looking up to Saturn

Bad Astronomy
The entire universe in blog form
Oct. 30 2012 7:00 AM

Looking up to Saturn

Just in case you've forgotten how brain-destroyingly big Saturn is:

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!  

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This shot of the ringed wonder was taken by the Cassini spacecraft when it was well over 2 million kilometers from the planet. The spacecraft was south of the rings, looking "up" toward the north. The Sun is shining down on the rings from this perspective, so they look darker than you might expect, and the use of a near-infrared filter accentuates storms in the southern hemisphere cloudtops.

So why does this picture grind my mind to dust? Look at the the very top, near the center. Can you see that dot of light? You might need to click the picture to get the hi-res version to see it better; that's how small it is.

Except it isn't. That dot of light is Mimas, a moon of Saturn, and it's 400 km - 250 miles - across! That's roughly the size of the state of Missouri, and compared to Saturn it's reduced to a mere pixel of light. And even then, Saturn's rings are still too big to fit in this picture!

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The scale of the solar system crushes me. And yet there we are, poking around and sticking our noses into it. We humans are pretty awesome.

Image credit: NASA/JPL-Caltech/Space Science Institute



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