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Jul 03, 2014, Eta is brightening as never before during our campaign. The event is coming!!!
At least one paper has projected that complete loss of the Earth's ozone layer is a plausible consequence of a nearby supernova, which would result in a significant increase in surface UV radiation reaching the Earth's surface from our own Sun. At least one scientist has claimed that when the star explodes, "it would be so bright that you would see it during the day, and you could even read a book by its light at night". A supernova or hypernova produced by Eta Carinae would probably eject a gamma ray burst (GRB) out from both polar areas of its rotational axis. Calculations show that the deposited energy of such a GRB striking the Earth's atmosphere would be equivalent to one kiloton of TNT per square kilometer over the entire hemisphere facing the star, with ionizing radiation depositing ten times the lethal whole body dose to the surface. This catastrophic burst would probably not hit Earth, though, because the rotation axis does not currently point towards our solar system. If Eta Carinae is a binary system, this may affect the future intensity and orientation of the supernova explosion that it produces, depending on the circumstances.
originally posted by: beezzer
a reply to: glend
It is between 7,500 and 8,000 light years away, so I do think we have a little time to prepare. . . . .
Upon writing this, I just realized my mistake. It could have happened @ 8,000 years ago.
Solid doom mode now.
originally posted by: Bassago
Stop! Stop! Stop!
For us non sciencey types what are you saying here? This other sun is going to blow up and is pointed at us? Please give the layman's version.
Note, if this is going to take thousands of years I don't really care.
originally posted by: yourmaker
I don't think we have anything to worry about really unless the gamma ray burst is directed at us.
Even then, apparently they only happen a few per galaxy every couple million years, and none in our own so far
A hypernova (pl. hypernovae or hypernovas) is a type of supernova explosion with an energy substantially higher than that of standard supernovae. An alternative term for most hypernovae is "superluminous supernovae" (SLSNe). Such explosions are believed to be the origin of long-duration gamma-ray bursts.
Just like supernovae in general, hypernovae are produced by several different types of stellar explosion: some well modelled and observed in recent years, some still tentatively suggested for observed hypernovae, and some entirely theoretical. Numerous hypernovae have been observed corresponding to supernovae type Ic and type IIn, and possibly also at least one of type IIb.
The word collapsar, short for collapsed star, was formerly used to refer to the end product of stellar gravitational collapse, a stellar-mass black hole. The word is now sometimes used to refer to a specific model for the collapse of a fast-rotating star
Hard x-ray pulses or increased cosmic radiation originating in nearby supernova explosions may be capable of temporarily removing most of the earth's atmospheric ozone cover even when direct radiation effects at the earth's surface are negligible. Consequently, terrestrial life may be subject to relatively huge solar ultraviolet fluxes every few hundred million years.