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A near-Earth supernova is a supernova close enough to the Earth to have noticeable effects on its biosphere. Depending upon the type and energy of the supernova, it could be as far as 3,000 light-years away. In 1996 it was theorised that traces of past supernovae might be detectable on Earth in the form of metal isotope signatures in rock strata.
An estimated 20 supernova explosions have happened within 300 pc of the Earth over the last 11 million years. Type II supernova explosions are expected to occur in active star-forming regions, with 12 such OB associations being located within 650 pc of the Earth. At present, there are 12 near-Earth supernova candidates within 300 pc. [3] [4] [5]
By this time it is estimated that a gamma ray burst, or massive, hyperenergetic supernova, would have occurred within 6,500 light-years of Earth; close enough for its rays to affect Earth's ozone layer and potentially trigger a mass extinction, assuming the hypothesis is correct that a previous such explosion triggered the Ordovician–Silurian ...
If this were to happen, any remaining life on Earth could potentially survive for far longer if it survived the interstellar journey. [105] 3.3 billion [note 1] There is a roughly one percent chance that Jupiter's gravity may make Mercury's orbit so eccentric as to cross Venus's orbit by this time, sending the inner Solar System into chaos ...
SN 1054 remnant (Crab Nebula)A supernova is an event in which a star destroys itself in an explosion which can briefly become as luminous as an entire galaxy.This list of supernovae of historical significance includes events that were observed prior to the development of photography, and individual events that have been the subject of a scientific paper that contributed to supernova theory.
It gives us a rare opportunity to study what happens to stars like this before they explode,” Joyce stated. If Betelgeuse were too close to Earth, the eventual supernova could cause an ...
Mars occults Regulus for the first time since June 28, 17,619 BCE. Despite the over 24,300-year wait, it will happen three more times over the next 677 years. 6757 July 5 There is anticipated to be a simultaneous solar eclipse and transit of Mercury, the first such simultaneous eclipse and planetary transit in recorded history. [144] 7541 ...
On May 21, 2008, astronomers announced that they had for the first time caught a supernova on camera just as it was exploding. By chance, a burst of X-rays was noticed while looking at galaxy NGC 2770, 88 million light-years from Earth, and a variety of telescopes were aimed in that direction just in time to capture what has been named SN 2008D.