Theoretical studies indicate that most supernovae are triggered by one of two basic mechanisms: the sudden re-ignition of nuclear fusion in a degenerate star such as a white dwarf, or the sudden gravitational collapse of a massive star's core. In the first class of events, the object's te...
10.This is a supernova, which when seen from Earth, appears as a bright new star in a place where none( or only a very faint star) appeared to be before.这就是超新星,从地球上看原本没有星星(者是一颗很黯淡的星)地方出现了一个明亮的新星。 11.A supernova is a violent explosion that ...
Kashiyama et al., 2013; Abbott et al., 2016a), it will become possible to capture the SN shock exploding through the progenitor star, which is known as a“SN shock break-out”. As such an event occurs within minutes to hours, they have only ever been detected serendipitously (e....
supernova,a massive star in the latter stages ofstellar evolutionthat suddenly contracts and then explodes, increasing its energy output as much as a billionfold. Supernovas are the principal distributors of heavy elements throughout the universe; all elements heavier than iron are produced in supe...
The first confirmed record of a supernova occurred in the year 185. Astronomers noted the bright star which suddenly appeared out of nowhere. The light lasted for about eight months before disappearing. They noted that, unlike comets, this light didn’t move in the sky. ...
He had turned down a first offer for a much smaller up-front fee in return for a ten percent share of profits, thinking the film would never make money, a reasonable assumption on his part. As later biographies noted, he needed this money immediately to pay for food and rent. However,...
Instead, a scenario consistent with the new findings suggests that SN 2006gy was a so-called Type Ia supernova, which occurs when one star pours enough fuel onto a dead star known as a white dwarf to trigger an extraordinary nuclear explosion. (White dwarfs are the superdense, Earth-size ...
The most dramatic supernova was observed in the year 1006. It appeared in May as a brilliant point of light visible during the daytime, perhaps 100 times brighter than the planet Venus. It was bright enough to cast shadows on the ground during the night and was recorded with awe and fear...
Kashiyama et al., 2013; Abbott et al., 2016a), it will become possible to capture the SN shock exploding through the progenitor star, which is known as a“SN shock break-out”. As such an event occurs within minutes to hours, they have only ever been detected serendipitously (e....
In 1181, a new star shone near the Cassiopeia constellation for six months before disappearing. This event, recorded as a "guest star" by Chinese and Japanese observers almost a millennium ago, has puzzled astronomers for centuries. It is one of a few supernovae to be documented before the...