Star Definition and 1000 Threads

Guess this is for those who have a clear sky overhead. As it is the glare and pollution don't let more than a few stars shine through where I'm at.

I'm trying to find some information about models of star formation (just out of curiosity). I only have a basic knowledge of text-book physics and calc, so it's hard to get started. In particular, I'd like to know how the theory is tested. The only prediction of Nebula theory that I can think...

Just watch the 8th star treck movie,and at the beggining a champagne bottle smashes into the side of a newly made neterprise. what I am wondering is,as its in a vacuum would the pressure inside the bottle pop the cork out,or is the cork in tightly enough that it wouldn't pop? (lets say the...

Maybe this is stupid question, but I am not sure how to get the diameter of the star cluster, I assume from the RA and Dec. I googled it and tried to come with a realtion between the RA , Dec and Diameter from Andrea's proposal but couldn't figure the correct answer This is all I find (see...

Homework Statement A spherical star of uniform density p and radius R is formed by the condensation of the interstellar dust from large distance due to gravitational forces. Find the energy change that occurs at some intermediate stage as the radius increases from r to r+dr Hence derive an...

R136a1, is a blue hypergiant star Reference: http://en.wikipedia.org/wiki/R136a1

I'm working on trying to determine a formula that can model the density of the sun. density: \rho = m/v the volume of a three dimensional figure is b*h therefore: v of cylinder = Area of a circle * h (delta r = h) v=\piR2\Deltar therefore: \rho = (\Deltam)/(\piR2\Deltar) If this...

Scientists find most massive star ever discovered, Like Charlie on 2 1/2 men, sounds like burning the candle at both ends... http://news.yahoo.com/s/ap/20100721/ap_on_sc/eu_most_massive_star

Saw a reaalllyy bright star-looking object in the sky tonight after looking online, I'm thinking it was Venus. That what all the articles online are leading me to believe. so... Has anyone else seen it? it looks amazing to be honest. I really wish I had a telescope.

Firstly, I would like to say hello to everyone as this is my first post. I am an artist working a personal project that will be a visual investigation into the effects of a collision between a Neutron Star and Earth. The star would have a fully collapsed core at 1.5 solar masses (maybe...

How do I get radial velocity of a star given a single body orbiting it in a 2-body system? I have the mass of both objects and for the second object it's eccentricity. Assume everything else is default or zero like the mean eccentricity. I compute the barycenter between the star and...

We consider two stars which initially were at rest with each other, and were gravitationally influencing each other. We assume a kind of gravitation force which propagates at light speed. Now we give equal velocity (in relatively opposite direction) to both stars. Since gravity is propagated at...

Reading from The Astrophysics Spectator: http://www.astrophysicsspectator.com/topics/supernovae/SupernovaeCoreCollapse.html "When a stellar core collapses, its high density spurs the creation of thermal neutrinos through a variety of processes. The core itself is not transparent to...

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...

I have a (probably elementary) question about the end of a massive star. I know that the two issues are a neutron star and a black hole, depending on the remaining mass of the core. In as much as I understand things, a type II supernova results from the sudden halting of the collapse of the...

For my vector calc class we were given an assingment to do some stuff with a binary star system. You might note the lack of vectors and the lack of calc; this is because I am just having an issue with the setup. I am sure I can get the rest without assistance. We are given the two stars of...

Homework Statement Two individual stars in a binary system (m1=mo, m2=2mo) are in circular orbit about their common centre of mass and are separated by a distance ro. At some stage, the more massive star explodes - resulting in the two stars having equal mass after the explosion...

Homework Statement If a neutron star were bright enough to see its surface with a telescope, we'd be able to see not just the hemisphere facing toward us but also part of the far hemisphere. Explain why and estimate the latitude above which the far side could be seen. Homework Equations...

What happens? [PLAIN]http://img15.imageshack.us/img15/5575/1271475630826.jpg

I was sitting with friends on the street, and we saw what appeared to be a star that was zigzagging. Of course, it wasn't a star. The zig-zagging wasn't in straight lines or anything, it was just moving, faster than any plane, it was very far away (just appeared as a pinpoint of light), and...

How can you measure the mean density of a neutron star if your only told its mass is three times that of the Sun?

http://spaceflightnow.com/news/n0210/11planet/ This is the only discovered planetary orbit around a close binary star that I know about. I have some general questions about planetary orbits around or within close binary systems or even the further apart binary star formations or triples...

Hi, Let's say that you had the following information (age with errors, U-B, B-V, V) for 100 star clusters, what would you do with it? What can it be useful for? Just wondering...

Homework Statement The mass of a star is 1.370×1031 kg and it performs one rotation in 38.10 day. Find its new period (in days) if the diameter suddenly shrinks to 0.330 times its present size. Assume a uniform mass distribution before and after. Homework Equations Ii * Wi = If * Wf...

has anyone ever read it? I'm reading it now, and sometimes I don't understand some of it (I'm in 8th grade), but it keeps me on my toes. Anyone else ever read it, and if so what do you think of it?

Homework Statement A planet of mass 8.01 MJ (MJ = Jupiter's mass is known) has been discovered orbiting the star HD 168443 . HD 168443 is an G6 IV star of L = 2.09 Lsun and T = 5300 K about 37.9 pc from the Earth in the constellation Serpens Cauda. The planet, so far known only as HD 168443b...

star is created from a cluster of gas. but how is this process take place? in the sense that what is driving the gas and dust to form a star? as only massive object can experience gravity. only after a star is formed, then gravity will come into play. but my question is? before gravity come into...

Why do we need helium for star formation?

Apparently, in the early universe, stars were massive - ranging up to about 500 solar masses. Furthermore the metallicity (elements other than H, He) in the early universe was effectively zero with only hydrogen, helium and trace amounts of lithium. Apparently, stars could reach large masses...

Is there such a thing as a black star? Not black hole. I read something from a national geographic magazine a few months back that was about an astronomical object. It was all black on the outside, emitted darkness instead of light, and it contained some water. It was some new discovery or...

Edit: nvm

Homework Statement There is no general analytical solution for the motion of a 3-body gravitational system. However, there do exist analytical solutions for very special initial conditions. The diagram below shows three stars, each of mass m, which move in the plane of the page along a circle...

Homework Statement Determine the dip in magnitudes and flux in the optical light curve caused by the planet in front of the star if the planet orbits at 0.1,1 and 5 AU: The star is a solar type star and the mass of both the planet and star are known as are their radii: The observer is 10pc...

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?

Hi When I was a kid, the largest telescope was Mt Palomar, a little over 5 meter diameter mirror. In spite of its large size, I always read that stars appeared as points of light through the scope if it were used visually, i.e. stars are too small and too distant to appear as disks. However...

"Artificial Telekinesis" - The Star Wars Force Trainer Seems to be legit. I have been aware of work with this technology, but I think this is the first commercial product that I've seen. https://www.youtube.com/watch?v=LJbIGJrQK84 In fact the toy seems to have been around for a time...

Homework Statement You wish to travel to the Pleiades (at a distance of 130 pc) in 10 years, according to the clock that you carry. How fast do you have to travel to accomplish this (express the velocity as a fraction of speed of light, v/c)? Homework Equations \Delta T...

A distant star has a single plante orbiting at a radius of 3.51X10^11m. The period of the planet's motion around the star is 853 days. What is the mass of the star? The universal gravitational constant is 6.67259X10^-11N m^2/kg^2. Answer in kg. Alrighty. So I tried to find the mass by using...

Think of a Star Trek dream team. Here's one that I made hastily. KIRK: Arnold Schwarzenegger SPOCK: Steven Seagal MCCOY: Peter Falk SCOTTY: Jim Carrey SULU: Bruce Lee CHEKOV: Brother Theodore UHURA: Whoppi Goldberg Wait! Whoppi was on the new ST. Jim Carrey would be funny being...

I need the % of stars in our galaxy, sorted by spectral classes and also by masses. Is there any such information somewhere ?

How many generations of stars were required to make the elements found on Earth. In other words, does a star have to be born with heavier elements for some even heavier elements to form?

Homework Statement For a star of mass M and radius R, the density increases from the centre to the surface as a function of radial distance r, according to \rho = \rho_{c}[1-(\frac{r}{R})^2] where is the central density constant. a) Find M(r). b) Derive the relation between M and...

Homework Statement A star of mass 1.81×1031 kg and diameter 8.10E+9 m rotates with a period of 25.0 days. Suddenly the star changes size, and rotates with a new period of 18.0 days. Assuming a uniform density both before and after the size change, what is the new diameter of the star...

Homework Statement A star of mass 1.81×1031 kg and diameter 8.10E+9 m rotates with a period of 25.0 days. Suddenly the star changes size, and rotates with a new period of 18.0 days. Assuming a uniform density both before and after the size change, what is the new diameter of the star...

Hello all, First, since I'm just a physics teacher, and not an astrophysicist, my questions may sound "obscure" or badly formulated. Especially since I'm not an English native speaker. Sorry about that :shy: I need a mathematical relation which could give the mass of a "theoretical" star as...

I have, through general observation, theorized what I believe to be a logical explanation for the appearance of life on Earth. Although to me, this theory seems to provide a logical and rational explanation for the question of how life appeared on Earth, I have very little knowledge of Physics...

when two neutron stars collide, do they creat both a balck hole and release gamma rays or does it happen in stages?

Homework Statement Question 1 - If two stars A of luminosity 9000 and B of luminosity 90 (both relative to the Sun) appear equally bright from the Earth, how much further away is A from B? Question 2 - Star A is twice as bright as Star B, but B is twice as far away as A. Which star has...

Homework Statement Assuming a neutron star is made from an incompressible material, what is the hydraulic pressure 50m below the surface? Mass = 1.98x10^30kg Radius = 10km 2. The attempt at a solution g=GM/r^2 = (6.67x10^-11 x 1.98x10^30)/ 10000^2 = 1.32x10^12 m/s^2 P=P_{0} + \rhogh Pa...

Hi, I'm actually a Design Engineer but I find the topic of Relativity extremely interesting and I was wondering if somebody could give me some guidance on this. If Planets and Stars (due to their mass) 'warp' Space-Time then this means that our Sun distorts the fabric of space just like a...