when Betelgeuse explode, what happen to earth?

Answer 1

We will notice (427 years later when the light reaches us) an exceptionally bright supernova (it is a big star, 650 solar diameters) which will last for a few months and then fade away, and the constellation of Orion will then look different, with no right shoulder. But within a few centuries the supernova remnant will develop in size and be an interesting object for amateur astronomers to train their telescopes on it, like the Crab Nebula (Messier Catalogue M1) is today,

The supernova that created the Crab Nebula probably occurred in April or early May, 1054 AD rising to its maximum brightness of between apparent magnitude −7 and −4.5 (brighter than everything in the night sky except the Moon) by July. The supernova was visible to the naked eye for about two years after its first observation. Thanks to the recorded observations of oriental astromomers of 1054, the Crab Nebula became the first astronomical object recognized as a supernova explosion.

Look at the photograph in the first link to see what Betelgeuse's remnant may look like, 952 years after the explosion. NB it is thought that the star that exploded in 1054 was about only 8-12 solar masses. and a more massibe star would leave a remnant with a rather dffferent chemical composition. At the heart of the Crab Nebula is the remains of the exploding star which is now a rapidly rotating pulsar, emitting a lot of radiation

Betelgeuse (Alpha (α) Orionis) is a semiregular variable star located 427 light-years away. It is the second brightest star in the constellation Orion, and the ninth brightest star in the night sky.

Betelgeuse is a red supergiant, one of the physically largest stars known. If it were placed at the center of our solar system, its outer surface would possibly extend to the orbit of Jupiter. As it is, Betelgeuse is so large and so close that it is the star with the third largest angular diameter as viewed from Earth.

The Star's Future
Astronomers predict that Betelgeuse will ultimately undergo a type II supernova explosion although it is possible that the mass is low enough for Betelgeuse to leave a rare oxygen-neon white dwarf.

Opinions are divided as to the likely timescale for this event. Some regard the star's current variability as suggesting that it is already in the carbon burning phase of its life cycle, and will therefore undergo a supernova explosion at some time in the next thousand years or so.

Skeptics dispute this contention and regard the star as being likely to survive much longer. There is a consensus that such a supernova would be a spectacular astronomical event, but would not — being so distant — represent any significant threat to life on Earth.

Even so, Betelgeuse would brighten at least 10,000 times as a supernova, causing it to shine with the luminosity of a crescent Moon. Some sources predict a maximum apparent magnitude equal to about that of the full Moon (mv = -12.5).

However, if Betelgeuse's axis (one of its poles) is pointed towards Earth there would be tangible effects here. A shower of gamma rays and other cosmic particles would be directed at Earth. There would be spectacular aurorae and possibly a measurable diminution of the ozone layer with consequent adverse radiation effects on life. In such an orientation towards the solar system it would also appear many times brighter than if its axis were pointed away.

Answer 2

I have never heard it could go hypernova. Wikipedia say this about it: At its current distance from Earth, such a supernova explosion would be the brightest recorded, outshining the Moon in the night sky and becoming easily visible in broad daylight. Professor J. Craig Wheeler of The University of Texas at Austin predicts the supernova will emit 10^53 ergs of neutrinos, which will pass through the star's hydrogen envelope in around an hour, then reach the solar system several centuries later. Since its rotational axis is not pointed toward the Earth, Betelgeuse's supernova is unlikely to send a gamma ray burst in the direction of Earth large enough to damage ecosystems. The flash of ultraviolet radiation from the explosion will likely be weaker than the ultraviolet output of the Sun.

Answer 3

well i don,t think it will affect us, we are just to far away, but lETs hope that, Betelgeuse dos not have any planets that support life,
other wise they will be toast,
good bye et it was nice knowing you

whats happening to the Houyhnhnm's

Answer 4

Since it's over 400 light years away, not much.


Doug

Answer 5

We will be taken over by Klingons - it's a conspiracy! lol

Oh, and the government will think of a way of taxing us all for it!!!