Science!
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Without reading his bio - John ended up in Perth? I'm going to put this here which will annoy some but it is engineering / science related and makes me laugh.:
maybe answered maybe too old but I'm pretty certain he went to Melbourne and his wife was an academic there
and I think one may be able to visit his park
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@Machpants said in Science!:
@Stargazer So not a big interest in the Olympics then? 2000 mascot was an echidna
I don't think it looked like that echidna
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thats a good thing init
Can't wait!
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@taniwharugby said in Science!:
thats a good thing init
Can't wait!
But they can’t tell me if I can put the washing out tomorrow
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Enjoy listening to Cox speak.
This is still hard to get your head around...
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How can you travel at the not quite the speed of light to something 250 million light years away in 50 years? Surely it would take you 250 million years to travel to andromeda AT the speed of light? What am I missing?
I don’t understand this stuff, my brain is not capable of understanding it
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Well, it's obvioulsy because
L = 356⅔~Sp + 2Fim /250m -
Light years and time are different ways to measure time though arent they?
As in 1 light year is nothing like 1 year for us?
As I said above, I don't know, I can't get my head around it.
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Light year is a distance, not a time. If you are travelling 250mm lights years in 50 years, then you are travelling at 5mm x the speed of light.
Been a while since I've done heavy physics, but I didn't think you could travel faster than light, and as you get closer to it, time slows down.
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@MajorRage exactly, a light year is the distance light travels in one earth year. Now, I’m pretty loathe to tell Brian Cox he’s wrong with his analogy, so come on TSF, someone must be wise enough or confident enough to explain why what he says is true
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@MajorRage exactly, a light year is the distance light travels in one earth year. Now, I’m pretty loathe to tell Brian Cox he’s wrong with his analogy, so come on TSF, someone must be wise enough or confident enough to explain why what he says is true
OK, so I did a bit of physics at Uni. Yep, I"m a nerd. Sue me.
Short answer: he's completely right.
Longer answer: it's complicated, because the speed of light is fixed and relativity is a weird thing. So, as you get closer the speed of light and keep accelerating, from your perspective time outside speeds up; from teh perspective of the outside universe, you slow down (and get heavier).Remember that Einstein guy saying energy and mass were interchangeable? Yep, that kicks in here too.
So, long story short, if you're moving incredibly incredibly quickly and do a return trip to Andromeda, it takes 5million years in earth time, but 100 years in spaceship time.
there's more on this here, but he is correct.