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#31
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Yes, a light year is a measure of distance yet that distance means that
it took one year to travel 6 trillion miles just like it takes one minute to travel one mile at 60 MPH (88ft/sec) so it can be used for time as well. |
#32
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I could have somewhat misunderstood this question. Although it is true
that precession doesn't change the apparent distance between anything other than planets (4 min/day) precession did put Vega over the North Pole when the Pyramids were built but now it's Polaris so in that perspective the constellations could have looked different from a latitude perspective. |
#33
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"Douglas Iverson" wrote in message
... I could have somewhat misunderstood this question. Although it is true that precession doesn't change the apparent distance between anything other than planets (4 min/day) precession did put Vega over the North Pole when the Pyramids were built but now it's Polaris so in that perspective the constellations could have looked different from a latitude perspective. Actually, the closest (bright) star to the pole during the building of the Pyramids was Thuban. The pole won't be near Vega for another 11,000 years |
#34
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#35
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I guessed on the actual star but the point is still the same. Coulda
swore it was Vega. |
#36
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Douglas Iverson wrote:
The Big Bang happened everywhere at once since there was no universe or space/time in existance. Stars move at different individual speeds outside of the speed of the fabric of space/time and closer stars will appear to move faster. so the Big Dipper did not look like a dipper in the past and won't in the future especially when it's stars go supernova. I don't think any of the Big Dipper stars are supernova candidates; the intrinsically brightest one is Eta UMa, a B star with an absolute magnitude of about -2, and I don't think even that one's big enough to become a supernova. Some of the others are close binaries and might therefore have the potential to develop into novas. -- Odysseus |
#37
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"Greg Neill" wrote in
: "Whisper" wrote in message ... "Douglas Iverson" wrote in message ... The Big Bang happened everywhere at once since there was no universe or space/time in existance. Wasn't there? That's crap methinks........ I bet if you go back 100 trillion light yrs there woulda been a universe in existence.......... Light years are not a measure of time. They're a measure of distance. If the current model is anything near correct, both space *and* time were created in the Big Bang. You couldn't go back 100 trillion years. Furthermore. Consider this. As the light from a distant galaxy reaches us, the galaxy had increased its distance (due to expansion). So, *now* it is really much further than the distance we see it as *then* For example. For an object at we measure at 12 billion light years with a redshift of 7 (*then*), the distance *now* is 23.3 billion light years. Qbasic code to do this calc from S&T. Download file LOOKBACK.BAS http://skyandtelescope.com/resources...icle_326_2.asp Article S&T September 1997 p59 Martin Lewicki |
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