We do really need to protect our planet, agreed. On Friday, June 27, 2014 4:24 PM, daniel turner via Utah-Astronomy <utah-astronomy@mailman.xmission.com> wrote: I can accept that mankind's exploration of the universe just plain ain't gonna happen within the lifetime of anybody alive today. It means we have to do the right thing with the one and only planet we have at hand. Dreaming is OK, but we have to face enough reality to at least stay alive on this one rock. DT
________________________________ light/gravity speeds are impossible. *IF* were are in fact locked at those speed limits, then mankind's personal exploration of the universe just plain ain't gonna happen, and I can't accept that.
So- with all of that in mind- who wants to play? :) -Barrett http://www.barrettscustomleather.com/physics.html
-----Original Message----- From: Utah-Astronomy [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Friday, June 27, 2014 9:25 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Opaque vs Transparent
Oh man, college physics was 35 years ago. You're making my brain hurt.
Assuming visible wavelengths?
And measuring in angstroms, or atomic radii? One phosphorus nucleus, for example, is as thick as 4 hydrogen nuclei (in terms of covalent radius).
Crystalline structured materials probably also have an interference effect on light at such scales.
I'm going to think about this while contemplating that one atom in my fingernail could be an entire universe, man. Like, wow, dude...
On Thu, Jun 26, 2014 at 9:04 PM, BWFlowers <BWFlowers@comcast.net> wrote:
Just as a pure curiosity question, that I have not been able to google successfully, and for clarity I will word the same question a couple of different ways-
What ELEMENT is the most opaque? Meaning- How thin can the most opaque element be before it will allow light to penetrate it at any level?
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