<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by rousejohnny</i>
<br />I was wondering is it possible that the Ort Cloud or the Heliopause could refract light? Also, is there a Galactic level outer boundry that could also refract light, but not scatter it?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">Matter densities are far too low for refraction (heliopause) or gravitational lensing (Oort cloud) to occur at a detectable level.
<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Does it matter if an object is moving away, toward or not at all, wouldn't the bend or refraction cause a redshift?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">Refraction is accompanied by a redshift (slowing of propagation speed) when moving into a denser medium, and a blueshift when moving into a sparser medium. This is also quite undetectable for the cases mentioned. -|Tom|-
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