Star Definition and 1000 Threads

Homework Statement Imagine a giant star, lit with twinkly lights for the holiday season. Are you interested in the magnetic field at the center of the star? Sure you are. The star has “arm” length (AF) equal to 1 m and 1 amp flows clockwise around the star. 1. Find the following lengths: BG =...

This relates to a feat in a classic Thor comic. Thor is blasted by a Graviton Bomb and "is instantly subject to a gravimetric attraction akin to that of a neutron star.". He is then "pulled irresistibly down by the incalculable increase in local gravity and is quickly buried from view by an ever...

How would you approximately describe matter in the core of underlying neutron star? I am asking for really fundamental properties. No strange matter, consider just n,e,p. A ratio, can we describe particles as free? Gas x fluid x superfluid? etc.

So here's my problem: The distance between two stars is constant(d = 4,3 * 1010m), and they have a common center of mass. Ms = mass of our star, ma = 0,82 * Ms and mb = 2,2 * Ms. What I'm supposed to do is calculate the period of orbit of both stars, which is the same for them both, since the...

Dear Friends, I need technical solution for my problem; Specification: I have two motors, type: 1. HCT/ATEX 45-2T-2 (R/MIN=2800), (400V-3,60A), (KW-1,50) 2. HCT/ATEX 45-2T-3 (R/MIN=2860), (400V-5,00A), (KW-2,20) Also, every motor has its own inverter: Inverters are from INVERTEK DRIVES...

Homework Statement So this isn't a question from a homework directly, but it's been used in my textbook an I'm not sure of the difference. For example, if I have a* and a+, what is the difference Homework Equations The exact wording in the book was {0,1}* and {0,1}+ The Attempt at a Solution...

Homework Statement (We are to solve this with Monte Carlo programming. Based on the universe from Olber's paradox) Suppose you are in an infinitely large, infinitely old universe in which the average density of stars is n = 10^9 Mpc^−3 and the average stellar radius is equal to the Sun’s...

Is this established or is it dependent on the size of the black hole? http://www.space.com/22180-neutron-stars.html Neutron stars pack their mass inside a 20-kilometer (12.4 miles) diameter. They are so dense that a single teaspoon would weigh a billion tons — assuming you somehow managed to...

1. The problem statement & given/known data A neutron star is a collection of neutrons bound together by their mutual gravitation. The density of such a star is comparable to that of an atomic nucleus (10^17 kg/m^3). a) Assuming the neutron star to be spherical in shape and of uniform mass...

I have a location of approximately 35 deg 14' S and 149 deg 4' E, and I have measured the position of the star Antares to be at an altitude of 27 deg 00' using an inclinometer, and direction 247 deg using a compass. Using this information can I calculate the direction of the star on the...

Greetings, Picture the following scenario: In an large Arena the all Star wars characters duell with each other in groups of two,which character would survive the longest. Note the following the arena may be completely neutral thus containing no manipulatable objects and is completely isolated...

So being a Star Wars buff I can't help but wonder if it would be possible to make a similar type of energy shield as per what are mentioned in the vast collection of Star Wars books out there, any thoughts anybody?

Homework Statement Find period of the star's rotation assuming that the axis of rotation is perpendicular to the direction of view. Given data: - distance d = 25 pc - bolometric luminosity observed m = 8m - effective temperature T = 4000 K - bolometric absolute brightness of the Sun Mm = 4,75m...

As the title of the thread suggests, I'm interested in estimating the velocity distribution of neutrons in neutron star cores. Putting T ~ 10^12K gives v ~ 15%c or more under Boltzmann statistics. Could someone provide more information or a second opinion on this estimate? Thanks.

I'm reading a book by Harry J. Gensler in which he introduces his 'star test' for checking whether or not a syllogism is valid. According to the star method the premises; all A is B all A is C has no valid conclusion. But wouldn't; some B is C be a valid conclusion? Sorry if this is kind of...

When the star stops burning because heavier elements like Iron are formed in its core. Then the gas pressure stops and as you know the gas pressure helps keep a star in equilibrium because it provides pressure against the force of gravity. So Iron does not give off energy. So what stops the star...

How do you estimate/calculate how much solar wind a star produces? (Can we even make a passable attempt?) I'm trying to work out whether a fictional exoplanet in orbit around R Coronae Borealis would need a magnetic field (as there appears to now be some debate on a cursory google search on...

What would happen to a neutron star (on the cusp of becoming a black hole) if it were sped up to near the speed of light? Or more easily done, if I sped up to near the speed of light. Would the additional mass from the near light speed cause the neutron star to collapse in on itself and form a...

I have been appointed the project manager at Rutherfurd Observatory, and was thus granted access to use the primary telescope. I spent 2 days trying to locate UY Scuti and finally, I've did it! For those who don't know what UY Scuti, it's the biggest known star in the universe. If it were to be...

Or is it too soon?

A star 890,000 light-years away patrols our galactic frontier By Ken Croswell, author of The Alchemy of the Heavens Just as every planet in the solar system orbits the sun, so every star in the Milky Way orbits the big black hole at our galaxy's center. But how far out does the Milky Way...

Hello I looked for a good forum which I can use for my specific questions. I hope I am right here. English is unfortunately not my first language, but I am working on improving it. So please have understanding for it. I need help in three phase drive technology. I read in my book...

As a teacher, I am trying to help students understand the scale of the universe. Using the analogy of sand as stars, and based on the average size of sand as .5mm across, I worked out... 1. The number of stars is greater than the grains of sand on all the beaches of the world (allowing...

Hi, I have real problems with the indices here, can someone give me a step by step explanation how to compute stuff with this formula? *\omega = \frac{\sqrt{|g|}}{r!(m-r)} \omega_{\mu_{1}\mu_{2}...\mu_{r}}\epsilon^{\mu_{1}\mu_{2}...\mu_{r}}_{v_{r+1}...v_{m}}dx^{v_{r+1}}\wedge...\wedge...

hi guys, my first post... i was wondering if there is anyway of stopping a star from going supernova... my proposal is as follows: if you where to have a star about to go supernova, (as a result of lack of fusion) in the middle of space, and then you had super massive bodies surrounding...

Interesting Hist Channel show on Star Trek and Physics: https://www.youtube.com/watch?v=vNiDoT7blX8 Of particular interest is the number of scientists who were influenced by Star Trek in their youth.

HD 140283, informally nicknamed Methuselah star is a ...subgiant star about 190 light years away from the Earth ...estimate an age for the star of 14.46 ± 0.8 billion years.[2] Due to the uncertainty in the value, this age for the star does not conflict with the age of the Universe , 13.798 ±...

This actually works! If you're tired of being disappointed by the gawd-awful movies that have come out recently, there is hope... http://www.startrekcontinues.com/ It takes a bit to adjust to the characters. A bit like jumping in a slightly cold swimming pool before getting used to it...

The question is attached. I'm not sure how to approach to part (b). The energy released could be in 3 forms, the rest mass energy for those matter ejected during supernova explosion, the binding energy released as the atomic structure changed, the ejected matter carries off some kinetic...

Homework Statement How do I show that for a binary star system, if one star has mass ##M_s##, speed ##V_s##, period ##P##, the mass of the other star is given by: ##M_P^3 \approx \frac{V_s^3}{2\pi G} PM_s^2##? Homework Equations The Attempt at a Solution \frac{GM_pM_s}{(a_p+a_s)^2} =...

Here is my understanding, please correct me if I am wrong, thanks At the end of the giant stage of a star, it experiences a supernova explosion, and turns into a neutron star (could be pulsar) or black hole, the explosion releases a lot of its matter. Here is what I don't understand: 1...

I think this is the right forum to start this thread, if not i am sorry please somebody change it . suppose a planet is in the right distance from its star and it is rocky , has water and atmosphere but the only thing is it's not rotating itself , i mean it's always facing it's star , then...

So My wife and I just got around to watching this last night and it was decent enough if you put your disbelief in cyrostasis but hey that's Strek Trek in general. That being said, and knowing there is no semblance of reality to the science, Of all the scenes that would have bothered me, it was...

The problem is attached, and the official answer is given. The step in the answer does not make a lot of sense to me. How does the luminosity L converted directly into distance d, and why is the solar distance is used? And where does the dm=0.75 come from. It's just not making sense to me...

Hey PF! Have two questions here for everyone. Recently had a professor define the The Big Bang as "the expansion and cooling of the universe from an originally hot and dense state", but is this correct? To me it sounded more like the description of cosmic inflation...thoughts? Additionally...

Homework Statement How to find out the equivalent capacitance using delta star conversion? Homework Equations Delta star conversion formula of capacitors The Attempt at a Solution Using the formula of resistors but not coming.What is the formula of delta star in capacitors?

Hello, I would like to know if there is any book or any useful links about star clusters, dealing with the following topics :[ formation, evolution, types (open, globular), etc...]. It is very difficult to find an organized document from google results, so if anyone is familiar with the...

Hello, I am looking for a model of galactic star formation that I can study. Particularly, I would like one that works well for mature galaxies like the Milky Way. It also should be relatively recent as well. I am primarily interested in the yearly rate of star formation for galaxies like the...

can dual star and triple star have planet around it ( possible ? ) . alpha centauri is a triple star right ? is it having any planet around it ? thanks for any response in advance .

I thought this was pretty neat: http://www.sci-news.com/astronomy/science-hvgc1-hypervelocity-star-cluster-01897.html http://arxiv.org/abs/1402.6319 From the abstract: We report the discovery of an object near M87 in the Virgo Cluster with an extraordinary blueshift of -1025 km/s...

I was curious as to why when a star discontinues fusion its gravitational pull grows stronger? My guess - When a star is actively burning, the fusion is somehow warping space and/or suppressing the gravitational pull. When the star stop fusion, this force is no longer present and the star feels...

First discovery of double star that brightens during eclipse Einstein's general theory of relativity explains the phenomenon by Dr. Ken Croswell For the first time, astronomers have seen a double star brighten rather than fade when one star passes in front of its companion. Predicted...

Hi, what is the name of the variable star with the longest period? I know Mira variables are in general the longest, but which particular star has the longest period? Thanks.

A few years back I started a thread to make the point that there is a common misconception about main-sequence stars that their fusion rate sets their luminosity, in the sense that to know what the luminosity of the star will be, you need to know what the fusion rate is. In particular, you...

Gas from another galaxy is hitting our own, triggering the birth of bright new stars and adding fresh luster to the Milky Way. Link: Scientific American

Homework Statement Is common point(O) equal to netural terminal? eg: Vo=Vn?? V(L1-o)=V(L1-n)?? The Attempt at a Solution The first one is what I measured in a lab. The second one my prediction if the phase reversed,base on the first one is it reasonable?

Consider a spherical star made of N (very large number) particles interacting via gravity.Let the mass of ith particle be mi and position be xi Let ##I= \sum_{i=1}^{N}m_{i}r_{i}##, U be potential energy and K be kinetic energy 1)Show that the virial equation takes the form...

when we draw a mass-time graph of a star in x-axis as time and y-axis as mass whether it will be linear or not?

Would you expect to find stars being made more easily in a cool, high-dense nebula or conversely a hot, high-dense nebula? Looking at for example the pillars of creation which is a stellar nursery, but what would be classified as hot and cold? relatively speaking. thoughts? thanks pf!

Hello, I wasn't sure whether I should post this is the homework section since it's technically a textbook problem, but I figured I'd get better responses here. The problem is as follows: Sirius is a visual binary with a period of 49.94 years. Its measured parallax is .37931"## \pm...