Who discovered SN 2006gy?
SN 2006gy was an extremely energetic supernova, also referred to as a hypernova or quark-nova, that was discovered on September 18, 2006. It was first observed by Robert Quimby and P. Mondol, and then studied by several teams of astronomers using facilities that included the Chandra, Lick, and Keck Observatories.
What is the brightest supernova ever recorded?
Now, researchers have announced the discovery of SN2016aps — the brightest, most energetic and probably the most massive supernova ever observed, reports Ryan Mandelbaum for Gizmodo. Supernovae are huge explosions caused by the deaths of stars at least five-times the mass of our sun, according to NASA.
What was the size of the star that caused supernova 2006gy?
Astronomers think something different happened with SN 2006gy, whose star was much bigger–about 150 solar masses. Stars this massive are extremely rare: Scientists estimate there are only a dozen or so such stars in the Milky Way’s stellar population of 400 billion.
What is so significant about 2006gy?
SN 2006gy has quickly distinguished itself as unique from other SNe in two important ways. First, after correcting for distance and extinction, it is the most luminous SN ever seen, and second, it has exhibited a remarkably slow rise to its peak luminosity and has stayed bright for a very extended time.
How long ago did SN2016aps explode?
The supernova, named SN2016aps, was observed by the PanSTARRS Survey for Transients on 22 February 2016, in a galaxy 4.5 billion light-years from Earth.
What did NASA scientists describe as the brightest stellar explosion on record on May 7 2007?
May 7, 2007: The brightest stellar explosion ever recorded may be a long-sought new type of supernova, according to observations by NASA’s Chandra X-ray Observatory and ground-based optical telescopes. “That means the star that exploded might have been as massive as a star can get, about 150 times that of our sun.
Has NASA ever seen a supernova?
A few weeks after a star exploded in the spiral galaxy NGC 2525 during the month of January 2018, NASA’s Hubble Space Telescope took consecutive photos for nearly a year of the resulting Type 1a supernova, designated as SN 2018gv.
What did NASA saw on March 7 2007?
During its encounter with Jupiter, New Horizons was able to capture new images of many Jovian moons, Jupiter’s complex and ever-changing atmosphere, and Jupiter’s Little Red Spot, pictured above.
What is created when a star loses its outer layers of gases?
The star will now begin to shed its outer layers as a diffuse cloud called a planetary nebula.
What do distant supernova explosions release?
Heavy elements are only produced in supernovae, so all of us carry the remnants of these distant explosions within our own bodies. Supernovae add enriching elements to space clouds of dust and gas, further interstellar diversity, and produce a shock wave that compresses clouds of gas to aid new star formation.
Will Eta Carinae become a black hole?
Each star in the Eta Carinae system is massive enough to form a neutron star in a supernova explosion. Because we’ve observed black holes in binary systems with a massive star companion, it is a good bet that the most massive stars like Eta Carinae do collapse to black holes.
What are the chemical reactions of alkyl halides?
Alkyl halides are organic compounds containing carbon – halogen bond. The polarizability of carbon – halogen bond greatly influences the chemical reactivity of alkyl halides. Alkyl halides undergo nucleophilic substitution reaction. Substitution reaction can follow S N 1 or S N 2 mechanisms.
Which is better for tertiary alkyl halides SN1 or SN2?
Formation of a planar carbocation in the first stage of the SN1 mechanism is favored for tertiary alkyl halides since it relieves the steric strain in the crowded tetrahedral alkyl halide. The carbocation is also more accessible to an incoming nucleophile.
How are alkyl halides used in nucleophilic substitution?
There are two different mechanisms involved in the nucleophilic substitution of alkyl halides. When polar aprotic solvents are used, the SN2 mechanism is preferred. Primary alkyl halides react more quickly than secondary alkyl halides, with tertiary alkyl halides hardly reacting at all.
How are thiols prepared from an alkyl halide?
These thiols are prepared by S N 2 reaction where sulfur source e.g. thiourea can react with alkyl halide to form urea and thiol. The reaction goes through an intermediate; isothiouronium salt that on hydrolysis forms thiol.