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The most recent naked-eye supernova was SN 1987A, which was the explosion of a blue supergiant star in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. Theoretical studies indicate that most supernovae are triggered by one of two basic mechanisms: the sudden re-ignition of nuclear fusion in a white dwarf , or the sudden ...
Much of the light curve, or graph of luminosity as a function of time, after the explosion of a type II supernova such as SN 1987A is produced by the energy from radioactive decay. Although the luminous emission consists of optical photons, it is the radioactive power absorbed that keeps the remnant hot enough to radiate light.
While all models agree there is a convective shock, there is disagreement as to how important that shock is to the supernova explosion. In the convective overturn model, the core collapses faster and faster, exceeding the speed of sound inside the star, and producing a supersonic shock wave.
The expansion shell has a temperature of around 30 million K, and is expanding at 4,000−6,000 km/s. [2]Observations of the exploded star through the Hubble Space Telescope have shown that, despite the original belief that the remnants were expanding in a uniform manner, there are high velocity outlying eject knots moving with transverse velocities of 5,500−14,500 km/s with the highest ...
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.
The Type Ia supernova leaves no compact remnant, but the whole mass of the former white dwarf dissipates through space. The theory of this type of supernova is similar to that of novae, in which a white dwarf accretes matter more slowly and does not approach the Chandrasekhar limit. In the case of a nova, the infalling matter causes a hydrogen ...
Energy released by explosion of 1 ton of TNT. 4.5×10 9 J: Average annual energy usage of a standard refrigerator [142] [143] 6.1×10 9 J: ≈ 1 bboe (barrel of oil equivalent) [144] 10 10 1.9×10 10 J: Kinetic energy of an Airbus A380 at cruising speed (560 tonnes at 511 knots or 263 m/s) 4.2×10 10 J: ≈ 1 toe (ton of oil equivalent) [144] 4 ...
The orange-red filaments visible in the image show the shock fronts of the initial supernova explosion. [3] These filaments have allowed astronomers to calculate the original barycenter of the explosion. The filaments also show that the explosion is no longer expanding as a sphere, but is elliptical in shape.