Supernova Definition and 197 Threads

If a star in our night sky were to go supernova, how quickly does this become apparent to the naked eye? I know the star collapses very quickly, but what will this look like to the naked eye? Will the star suddenly become brighter within seconds or minutes, or gradually over hours or days?

Hey guys. Just wanted your thoughts on this. If Betelgeuse went supernova soon, like in the next few years, how helpful to our understanding of supernovae would it be? Given it's short distance and ability to directly see the surface of the star, would this be like the "holy grail" of type 2...

Homework Statement I have a question in my coursework where I don't know where to start. I've got Nickel decaying post the explosion, I've got a time t, I've got an energy release per nucleus of Nickel, I've got a decay constant, I've got a light curve decay half life, and I've got a...

Just saw this: http://blogs.discovermagazine.com/badastronomy/2012/03/19/breaking-possible-supernova-in-nearby-spiral-m95/ Looks like there might be a new supernova in M95!

Homework Statement In its early phase, the supernova is an explosion within the star’s own envelope; about half the energy is thermal and half is kinetic. Estimate the ratio of radiation pressure to gas pressure in the star at the moment the shock reaches the surface. (Not in the pre-explosion...

Hello, This is a question that I've been contemplating for the last few days. I was watching a video about black holes & supernova, and I am wondering what would happen if a black hole were to reach a star at the exact moment that it "turned into" a supernova? What would happen if that...

Hey guys. This is my first post here and I hope many more will follow. Now on to the topic at hand… I’ve been doing some research into the solar system’s formation and evolution. As many of you are probably aware, the solar system’s heavier elements are believed to be the remnants of a...

It might be stupid to think this way but it came to my mind and I wasn't able to find anything related to this on internet so please help me understanding this thing... Say if we have a massive star and a black hole nearby and the massive star completes its life cycle, it will end up with a...

Just got this shot this morning and that baby's still brighter than many of the foreground stars even after 3 months. http://en.wikipedia.org/wiki/SN_2011fe http://img804.imageshack.us/img804/8462/m101sn.jpg

Is it possible to calculate the force in Newtons for a Supernova? Have any such calculations ever been possible or done by the scientific community? I can imagine the number would be in the trillions of trillions but I am simply interested.

In this thread I would like you to add some more detailed information on what the people behind the new physics prize have actually found, what the interpretation is and where the relevant papers are. The redshifts of supernovaes of type 1a are redshifted in some peculiar way that is...

So one guy comes to me and says that he doesn't believe that a supernova 50ly away would be dangerous enough to pose a lethal threat to us. I contradicted him because based on my general reading supernovas (depending on their magnitude) between at least a 100 to 3000 light years away would...

Anyone know what its current mag is and will be over the next little while? I may be too late. I went out last night for a couple of hours but could not make it out. If there's a website that shows its likely mag over the next little while, I'd be appreciative.

The new supernova is in the "pinwheel galaxy", M101, near the edge of a spiral arm. The galaxy is in Ursa Major, roughly where the tip of the bear's tail would be if it flicked upward! It has reached magnitude 10.2, so not a naked-eye object, but visible with binoculars. For a map, see...

Would a star that is too small to go supernova (Sol or Alpha Centauri) still go supernova if its core somehow instantly vanished? Wouldn't gravity collapse it and wouldn't that pressure be the same as the pressure that makes larger stars go supernova?

If somehow a supernova will be redirected to 30, 45, 60, 80, 90 degrees cone, would the blast received be powerful than the 360 degree blast?. and how small would a "solid hydrogen ball" (to create a small star) amount for when it's compressed... just small Gamma Ray Bursts and explosion is...

New type of supernova outshines the rest http://physicsworld.com/cws/article/news/46227 http://media.caltech.edu/press_releases/13425 http://www.astro.caltech.edu/~quimby/ www.astro.caltech.edu/~quimby/quimby_lsn_talk.pdf[/URL] - Luminous supernova talk (Nov 10, 2010)...

Here's a question I thought about while watching one of those simplified 'the universe' documentaries on discovery channel. If a supernova in our region of the galaxy exploded and the gamma rays from the poles of the neutron star or black hole reached us, it was mentioned it would happen too...

What are the informations deducible from Hubble diagram of supernova 1a?

Supernovas (exploding stars) are the most power explosions known to science. They are so awesomely powerful, they actually tear holes in the fabric of reality (space time) and create black hole singularities. Approximately how many megatons are there in a supernova? Are megatons (4.184×1015...

Homework Statement Star D goes supernova at x=0 and t=0. One year later and 2 ly away (measured by astronomers in the galaxy), star E explodes. The explosions are observed by 3 spaceships going from D to E at respective velocities: v1=0.3c v2=0.5c v3=0.7c What are the times of the two...

Egyptian pyramids(constructed 2630 BCE–2611 BCE) according to wiki, and they point to Orion Nebula. "The creation of the Crab Nebula corresponds to the bright SN 1054 supernova that was recorded by Chinese astronomers and Arab astronomers in 1054 AD" according to wiki. Would it be possible...

It is going to be a long question, thanks for reading and answering it on advance, In order to get a star explode as a supernova, it should be big enough and should finish its fuel (hydrogen) after the star explodes as a supernova the iron in center fused to heavier elements such as gold...

I've occasionally seen the idea of a "starkiller". The first I saw it was in the game Star Trek Bridge Commander where a special craft fires a beam into a star to make it go supernova. But it doesn't elaborate on how. In Andromeda (haven't seen it, only read about it) they destroy stars...

Hey all. I just read about Photodisintegration leading to a supernova in stars above 250 solar masses and I thought it was pretty cool. Apparently the gamma ray photons get so energetic, they start to get absorbed, which excites the nucleus and leads to an ejection of a proton or a neutron. When...

Are there any programs which could be used to fit the Supernova data to constrain the cosmological models's parameter? thx

Having trouble understanding how "We" are made from a supernova? Ok, I may not be understanding this right, so maybe someone can shove me in the right direction. Without getting into the mechanics of a supernova, we are remnants (carbon and what not) from a supernova, so in a way, the...

hi guys many thanks in advance for any help, I am revising for an exam and got stuck on this question: "A supernova of energy 10^44 J explodes in interstellar matter of density n0 = 10^6 m^−3 and pressure Pi = 3*10^−14 N m^−2. Estimate how much gas (mass) can be disturbed by this supernova...

Homework Statement A space craft, traveling at 0.77c, is just passing the Earth when the light from a Supernova which is traveling in exactly the opposite direction to the ship, reaches it. According to an observer on the Earth the star which caused the explosion was 720 light years away (1...

Hubble viewed a new Supernova in the constellation Cygnus, IRAS 20068+4051. It's current view from Hubble shows a spiral. Will this increase in size or remain a spiral? http://www.spacetelescope.org/images/potw1030a/

Homework Statement Compute the speed of debris seen hitting the inner ring of Supernova 1987A. Assume radius of inner ring is 0.7 light years. Homework Equations The Attempt at a Solution I'm not quite sure where to start. I thought about just using kinetic energy = 0.5mv^2 because I...

Here, tell me if this will work. A chamber made of thick lead is taken and a vacuum is put on it. There are electromagnets between the lead. A ball of unstable uranium and osmium that is plated with iron is put in the chamber and suspended by the magnets. Then protons and neutrons are...

I have been arguing the case that the universe may be a modified Milne model. Let me ask my questions first. First, I am asking about graphs and data presented here: http://www.astro.ucla.edu/~wright/sne_cosmology.html Questions 1) The "binned data" appear to be points with constant...

in discovery they were showing that at last stage of a star it creates witihn itself different metals...bt wen it creates iron its time for its death...why iron makes the star burst into supernova?/any one please tell me...

I was wondering for the majority of the projectiles from supernova what would be roughly their velocities. Has anything been determined or theorized? Thanks in advance

The following two graphics are supposed to be the same, but they are not (there is something I am not getting right). After the calculation of m ( z ) (magnitude as a function of redshift) I get the plot of the first link: -Plot at the bottom (NOT the last one) of...

I saw this on another site. The star Betelgeuse going supernova soon? I was talking to my son last week (he works on Mauna Kea), and he mentioned some new observations (that will no doubt get published eventually) of "Beetlejuice"; it's no longer round. This is a huge star, and when it...

http://www.dailygalaxy.com/my_weblog/2010/05/do-newly-discovered-exploding-stars-point-to-new-laws-of-physics.html#more In the past decade, robotic telescopes have turned astronomers' attention to strange exploding stars that may point to new and unusual physics. An international team of...

Supernova Remnant Help! Hi guys, Im just about to finish up my project work for my thesis which is on Cas A. I have calculate the distance between my knot and old knot from a previous experiment in arcsecs. I now need to find the velocity of my knot. Any ideas on how to calculate it?? I know i...

Homework Statement A super nova releases 1.9E45 J of energy over a 10 day period. It is 1560 ly from earth. A detector, facing the star, is a disk of radius 7cm. How much energy reaches the detector? (The detector is in orbit, so it can face the star for the entire 10-day period) Homework...

I hear that large telescopes can resolve the Andromeda galaxy into individual stars. Is it possible to do the same for galaxies outside our local group? Also, have we observed any stars which sit in deep inter-galactic space, far from any galaxies?

Is there anyway we can determine if Betelgeuse has gone supernova earlier this month? (theoretically speaking)

The preprint on this has not come out yet. What we have is a 5 January blog entry by Sigurdsson. http://scienceblogs.com/catdynamics/2010/01/has_a_supernova_type_ia_progen.php The work concerns T Pyxidis and is by a group at Villanova University led by Prof. Edward Sion. What I get from this...

Hi all, In this article: http://www.space.com/scienceastronomy/091105-new-supernova.html , they mentioned supernova and nova. Anyone tell me the difference between the two 'cosmic explosions' Thanks

A recent study indicates that Betelgeuse has decreased in size by 15% since 1993. http://esciencenews.com/articles/2009/06/09/red.giant.star.betelgeuse.mysteriously.shrinking

Can a primitive galaxy nova or supernova? Might the former process be involved with star production or the latter with a quasar?

Hey ppl i wanted to know that wat is the name of the method with which astrosphysicists are able to detect the elements present in supernovae.for eg they say type 2 suprnva is mainly hydrogen containing. Is it by spectroscopy if yes which one? pleasez temme soon

From what i have read the gamma ray frequency cap ranges from 3×10^19 to 3×10^24. I want to know what you guys have heard it is. Are the highest measured gamma ray from a supernova calculated with any time dialated effects? Also what is the thoertical cap of something higher than a gamma ray...

Boy, NexTag sells everything! I just Googled for "type 1a supernova" and they tell me I can buy one cheap! Who could resist?

Homework Statement A supernova remnant has an angular diameter \theta = 4.3 arc minutes and a flux at 100MHz of F_{100} = 1.6×10^{-22}J s^{-1}m^{-2}Hz^{-1}. Assume that the emission is thermal. (a) What is the brightness temperature, T_b? (b) Suppose that the emitting region were actually...