Pliocene - Supernovae

Supernovae

In 2002, Narciso Benítez et al. calculated that roughly 2 million years ago, around the end of the Pliocene epoch, a group of bright O and B stars called the Scorpius-Centaurus OB association passed within 130 light-years of Earth and that one or more supernova explosions gave rise to a feature known as the "Local Bubble". Such a close explosion could have damaged the Earth's ozone layer and caused the extinction of some ocean life (at its peak, a supernova of this size could have the same absolute magnitude as an entire galaxy of 200 billion stars).

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Other articles related to "supernovae":

Super Nova - Discovery
... Because supernovae are relatively rare events within a galaxy, occurring about once every 50 years in the Milky Way, obtaining a good sample of supernovae to study requires regular monitoring of many ... Supernovae in other galaxies cannot be predicted with any meaningful accuracy ... Most scientific interest in supernovae—as standard candles for measuring distance, for example—require an observation of their peak luminosity ...
Super Nova - Interstellar Impact - Effect On Earth
... In 1996 it was theorized that traces of past supernovae might be detectable on Earth in the form of metal isotope signatures in rock strata ... ions were found in Antarctic ice, which coincided with the 1006 and 1054 supernovae ... Gamma rays from these supernovae could have boosted levels of nitrogen oxides, which became trapped in the ice ...
List Of Supernovae
... This is a list of supernovae that are of historical significance ... These include supernovae that were observed prior to the availability of photography, and individual events that have been the subject of a scientific paper that contributed to supernova theory ...
Dark Energy - Evidence of Existence - Supernovae
... In 1998, published observations of Type Ia supernovae ("one-A") by the High-z Supernova Search Team followed in 1999 by the Supernova Cosmology Project suggested that the expansion of the universe is ... lensing, and the large scale structure of the cosmos as well as improved measurements of supernovae have been consistent with the Lambda-CDM model ... Supernovae are useful for cosmology because they are excellent standard candles across cosmological distances ...
Mark M. Phillips
... astronomer in the observational studies of all classes of supernovae ... This relationship has allowed the use of Type Ia supernovae as standard candles, leading to the precise measurements of the Hubble constant H0 and the deceleration parameter q0, the latter implying the existence of ... In addition to his work on supernovae, he has also worked extensively on the spectroscopic studies of Active Galactic Nuclei ...