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Off-Topic Discussion => General Discussion => Topic started by: Xelion on September 06, 2001, 01:04:00 am

Title: Red Shift
Post by: Xelion on September 06, 2001, 01:04:00 am

Does anyone around here know any red shift sites or how to calculate red shift for two objects?

Title: Red Shift
Post by: Setekh on September 06, 2001, 03:00:00 am

 http://hyperphysics.phy-astr.gsu.edu/hbase/astro/redshf.html ("http://hyperphysics.phy-astr.gsu.edu/hbase/astro/redshf.html")

First hit from Google ("http://www.google.com")  (http://dynamic.gamespy.com/~freespace/ubb/noncgi/smile.gif)

Title: Red Shift
Post by: Xelion on September 06, 2001, 03:39:00 am

  (http://dynamic.gamespy.com/~freespace/ubb/noncgi/eek.gif) I don't believe this, you came up with that link by searching through google and I use copernic and didn't really get anything useful at all. arghh   (http://dynamic.gamespy.com/~freespace/ubb/noncgi/mad.gif) (slaps Copernic in the head. If it had one)

Well thanx for the link Setekh its very helpful.

  (http://dynamic.gamespy.com/~freespace/ubb/noncgi/cool.gif) looking through hyperphysics site. doh! doh!   (http://dynamic.gamespy.com/~freespace/ubb/noncgi/confused.gif) Okay does anyone know the difference between Red Shift and Parallax?

[This message has been edited by Max (edited 09-06-2001).]

Title: Red Shift
Post by: Setekh on September 06, 2001, 03:46:00 am

Not a problem - parallax? It's when you move around something, and a moving object looks like it's changed direction, when in fact it was you who changed direction.  (http://dynamic.gamespy.com/~freespace/ubb/noncgi/smile.gif)

 

Quote

From Dictionary.com ("http://www.dictionary.com"):
par·al·lax (pr-lks) n.
An apparent change in the direction of an object, caused by a change in observational position that provides a new line of sight.

Title: Red Shift
Post by: Xelion on September 06, 2001, 03:55:00 am

Which means that Red shift measures the distance between two objects. right

Title: Red Shift
Post by: Jabu on September 06, 2001, 06:12:00 am

Red shift is just the calculation of a stellar-scale Doppler's effect. If a star is coming towards you, it's spectrum will shift towards the purple end, as it's sending higher-frequency light (the waves are closer together, because it's coming straight at ya). Red shift is the opposite, if a star is moving away, the spectrum shifts toward the red end because the waves are being stretched, thus becoming longer. (Red has the longest wavelenght of visible light, purple the shortest)

This is all from memory, and I'm only a wee lad, so I may well be wrong.

Title: Red Shift
Post by: Joey_21 on September 06, 2001, 05:52:00 pm

I believe this is how the distance between stars are figured but I'm not 100% sure... but sounds like it though.

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[This message has been edited by Joey_21 (edited 09-06-2001).]