How did the Crab Nebula get to be 5.5 light years in radius if its supernova explosion only happened 1000 years ago?
You know, because matter can't travel the speed of light. Something seems fishy here...
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answers:
Zheia say: There's nothing fishy unless the nebula is in Pisces.
It's had 1000 years to travel 5.5 light years radius. So in 1 year the debris travels at 5.5/1000 light years per year =0.0055 light years per year.
In miles this is: 5.5 x 6000000000000 / 1000 miles per year = 5.5 x 6000000000 = 3.3 x 10^10 miles per year. (1 light year is 6000000000000 miles).
This is 3.3 x 10^10 / 31557600 miles per second = 1045.7 miles per second. (There are 31557600 seconds in a year, the speed of light is 186000 miles per second).
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aladdinwa say: You can't figure out that 5.5 Light Years in 1,000 years is an expansion rate of less than six one-thousandths of a Light Year per year? That is less than six one-thousandths of the speed of light.
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roberto say: guys above answered it,it was a mega explosion,debris which is still KKKs of degrees hot,,heavy masssive chunks plus gases,thrown out at a few percent of lightspeed,,chinese astronomers observed it in 1354,,it lit up the earth night sky like daylight.
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quantumclaustrophobe say: Because the explosion was *very* energetic - sending debris out much faster than we're able to send probes (like Voyager).
Voyager is about 16.5 light-hours from Earth; that's about
186,282 x 60 x 60 x 16.5 = 11,065,150,800 miles, and it's taken 42 years to get there. That's about 263,455,971 miles per yer.
5.5 light years is about 32,332,370,637,600 miles, so the Crab Nebula's outer shell of debris is moving about 32,332,370,637 miles per year.
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nineteenthly say: There's no problem there. The image we see of the Crab Nebula is of it roughly a thousand years after it exploded, and 5.5 light years is a distance which can be travelled at a small fraction of the speed of light, namely around 0.5%.
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Flouride say: light travels 1000 light years in 1000 years, and 1000 is much greater than 5.5. what seems so fishy?
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Ronald 7 say: We are seeing the effects of its Radiation that does have Light Speed
There is ample time for it to affect the surrounding Matter for at least 1, 000 Light Years across
There are stellar Nurseries among the clouds
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USAFisnumber1 say: Matter can travel CLOSE to the speed of light. And if the explosion was 1000 years ago how come it is not bigger than 5.5 light years across? Even if the matter moved at 1% the speed of light the nebula should be 10 light years across.
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Andy C say: Like your math?
Take another look.
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Woody say: It takes 2.75 years at light speed to achieve this radius. 1000 years is more than enough time. Nothing fishy there.
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Nick say: from observers on earth, 1000c is far enough to exceed this amount
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Tom S say: The supernova explosion happened about 7,488 years ago. It was seen on Earth about 965 years ago. Since the star which went supernova is about 6,523 light years away!
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say: https://en.wikipedia.org/wiki/Crab_Nebula#Distance
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Atheist Dude say: 5.5 light years in 1000 years would be an average.
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Who say: 5.5 years compared to 1000 years?
aint you very good at maths or just stupid?
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poldi2 say: Yes, 5.5 light years in 1000 years would be an average of 1 light year in 182 years - how is that fishy...?
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Sharon say: it happened over 6000 years ago. You forget the time the light took to get here
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Iridflare say: Obviously the arithmetic went a bit wrong, but some of the Crab Nebula is the remains of the planetary nebula phase of the star's evolution - it's been there for a lot longer.
My bad! Not the planetary nebula phase (there isn't one for high mass stars) - but material blown off before the supernova.
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say: You might want to retake grade 5 math.
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Captain Matticus, LandPiratesInc say: It expanded 5.5 light years in 1000 years, which means that it expanded at about 1/182nd of the speed of light.
So how exactly did you figure that it's expanding faster than the speed of light?
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Fido say: Your grasp of mathematics is the only thing that's fishy here ;-)
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STEPHEN say: 5.5 light years in diameter in 1,000 years doesn't require anything to move at the speed of light. It requires roughly 1/330th the speed of light.
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CarolOklaNola say: 2019 - 1054 = 965 years, not 1000. Your facts are uncoordinated and your math is wrong, fishy. The material CAN be moving at relativistic speeds and NOT be moving AT the speed of light IN A VACUUM.
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Hindusufi say: 5.5 light years in one thousand years. The math is rather simple on this one, do the math.
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