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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.
The Crab Nebula is a pulsar wind nebula associated with the 1054 supernova.It is located about 6,500 light-years from the Earth. [1]A near-Earth supernova is an explosion resulting from the death of a star that occurs close enough to the Earth (less than roughly 10 to 300 parsecs [33 to 978 light-years] away [2]) to have noticeable effects on Earth's biosphere.
In recent years, astronomers studying the red supergiant Betelgeuse, about 645 light-years away from Earth in the Milky Way, have seen that star unexpectedly dim, which led some to believe it was ...
Most recent Local Group supernova SN 1993J: Ursa Major +10.7 [18] 11,000,000 IIb M81: One of the brightest supernovae in the northern sky since 1954 SN 1994D: Virgo +15.2 50,000,000 Ia NGC 4526: SN 1998bw: Telescopium? 140,000,000 Ic ESO 184-G82: Linked to GRB 980425, which was the first time a gamma-ray burst has been linked to a supernova. SN ...
The supernova was about 21 million light-years from Earth and is expected to have left behind either a neutron star or black hole, based on current stellar evolution models. The supernova is located near a prominent HII region, NGC 5461, in an outer spiral arm of the bright galaxy. [3] By 22 May 2023, SN 2023ixf had brightened to about ...
2 Exceeding 7 minutes of totality, this will be the first time this has happened in 177 years; the last one occurred on June 30, 1973, [139] when the Concorde prototype followed the totality spot for 73 minutes. 3 Largest total solar eclipse in the 3rd millennium, with a magnitude of 1.08074 [140] 4 Very close to the theoretical maximum.
Since 2007, climate change has been a leading concern that determines the placement of the clock. The clock was initially set at seven minutes to midnight and has moved 25 times since then.
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.