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That depends entirely on how far the supernova is from Earth. If it is our Sun going supernova, a little over 8 minutes. And a few Milli-seconds later all life on Earth would be gone. Any other star, it would just appear slightly brighter for a while and then disappear. It could take centuries for the light to reach us.
What else can I help you with?
How long would it take for us to know about a star that goes supernova from 500 light years away?
The light of the explosion wouldn't arrive at the Earth for 500 years.
Is a star going supernova in the Orion?
There are currently no stars in the Orion constellation showing signs of going supernova. If a star in the Orion constellation were to go supernova, it would likely be visible to us on Earth given Orion's proximity.
Are supernova dangerous to the earth?
A near Earth supernova [See Link] is a supernova that occurs close enough to the Earth (less than 100 light-years away) to have noticeable effects on its biosphere. Gamma rays from a supernova induce a chemical reaction in the upper atmosphere, converting molecular nitrogen into nitrogen oxides, depleting the ozone layer enough to expose the surface to harmful solar and cosmic radiation. This has been proposed as the cause of the Ordovician extinction - [See link], which resulted in the death of nearly 60% of the oceanic life on Earth. Type Ia supernova [See Link] are thought to be potentially the most dangerous if they occur close enough to the Earth. Because these supernova occur from dim, common white dwarf stars, it is likely that a supernova that could affect the Earth will occur unpredictably and take place in a star system that is not well studied. The closest known candidate is IK Pegasi [See Link] Recent estimates predict that a Type II supernova would have to be closer than 26 light-years to destroy half of the Earth's ozone layer.
How long would it take to get to the planet like earth?
5 thousand years
How long would it take to see a star explode on earth?
That depends on how far away the star is. If the exploding star is 1,000 light years away we would see the supernova 1,000 years later. If it is 2,000 light years away we would see it 2,000 years later.
How long would it take for us to know about a star that goes supernova from 500 light years away?
The light of the explosion wouldn't arrive at the Earth for 500 years.
IF the crab nebula is 6300 light years from earth how long did take the light from the supernova to reach earth?
6,300 years
How long would it take for a cheetah to circle the earth?
It would take about a month.
How long does is it take to go to the center of the earth?
It would take 120 years to go to the center of earth
How long would it take to fall though the earth with air resistance?
it just won't take long
How long would it take the light from a star 72 light year away from earth to reach the earth?
Easy answer: it would take 72 years.
How long would it take mercury to orbit the sun in earth years?
it would take 88 earth days to orbit the sun so it is 1/4 earth years.
How long would it take to get to Triton from Earth?
around to ten years
How long would it ruffley take to get to the Earth to the Moon?
3 DAYS
How long would it take to burn a living person from earth?
10MIN
How long do it take the earth to rate?
how long do it take the earth to rotae
How long would it take for a space shuttle to travel to Saturn?
long time compare to earth
