Star Definition and 1000 Threads

I was reading this article @ Medium, which shows our Neanderthal (3K or so times removed) cousin looking at Scholz's Star: And then the Wikipedia article about it https://en.wikipedia.org/wiki/Scholz's_Star which says: Prehistoric folks most certainly did NOT have access to telescopes...

I’ve read many Legends and Canon Star Wars books and I always take away stuff on their limits of technology and science. Over the years; here are some things they said science can’t do. 1.) Cybernetic liver- In Lost Stars, it was said Ciena’s liver could not be replaced as it was one of the...

I'm running some molecular dynamic simulations and I came across this, https://en.wikipedia.org/wiki/Star_formation#Cloud_collapse , and I was wondering if there was a specific force potential to use in this case. Supposing I have a ensemble of heated atoms moving around and I cool them down...

Hi everyone! I had the opportunity to see the series premiere of Star Trek: Picard and really liked it. As a long-time fan of TNG it was a great episode re-introducing us to Picard, and can't wait until the next episode is available. I was wondering how many of you here on PF has seen it.

Gravity is the curvature of space time. Stars move relative to each other. How is the information of this change transmitted through spacetime? I have just finished reading "Reality is not what it seems - The journey to quantum gravity" by Carlo Rovelli. (Can the content of a book be discussed...

I am working on a problem which asks for the B-V magnitude of a star cluster given N stars of type F and M stars of type K. I have values for B-V for both stellar types. I've derived a general formula for computing the magnitude of the cluster from the magnitudes of each star type, which...

WARNING! This thread contains spoilers for Star Wars: The Rise of Skywalker. If you have not yet seen the movie, we strongly encourage you to turn around and return once you have. Please use this thread for discussions about The Last Jedi, including spoilers. :smile:

hi guys, I have a rock, I think its a complete star or maybe core meteorite, what do you think about it? It was found a few months ago in mountains in Shandong Province in China. desc: composition：Nickel iron diameter: 4cm weight:264g Regards Leonard

I read that after explosions supernovas can ”transform” into a neutron start or into a black hole? And now I’m curious of therer any factors which can predict what thing we’re going to get after the supernova’s explosion.

I have a question regarding Neutron Star cores that perhaps PF could clarify for me. Given a millisecond spinning NS, and given that its gravity decreases toward the center, being a spherical body, does centrifugal force displace the core material outwards to form an empty obloid-shaped cavity...

So as the title suggests, I'm looking for some introductory books on Star Formation. I have a rudementary idea of the concept from a module I took last year which I found really interesting. I'm looking to apply for a research scholarship next academic year in which I would undertake a research...

There is the famous experiment of measuring the "movement" of a star close to the sun during an eclipse. The stars position is determined before the disc of the sun moves just under it and than the position is again measured when the sun moves just "under" the star. The star will have appeared...

This Wiki page I've been editing for months with stuff I've read on the internet. Based on existing science and tech already available in Star Wars, which of these would be challenging for a scientist in Star Wars to create? Try to explain why and you can pick multiple entries. Remember, Star...

I could never be an engineer here on Earth. I’m too dumb. My math skills and spatial intelligence suck. I wonder. If I lived in the Star Wars galaxy, would it even be harder to be an engineer since everything is so much more advanced? I imagine engineering schools in the Star Ward galaxy only...

I first determined ##E_{U - B}## by using the second equation listed above: $$U - B = (U - B)_0 + E_{U - B}$$ $$8.15 - 8.50 = -0.45 + E_{U - B}$$ Then since the ratio to the B-V color excess is known, I solved for that and obtained ##E_{B - V} = 0.14##. Using the ratio of total to selective...

Homework Statement: A binary star system consists of M1 and M2 separated by a distance D. M1 and M2 are revolving with an angular velocity w in circular orbits about their common center of mass. Mass is continuously being transferred from one star to the other. This transfer of mass causes...

Hello. I was wondering if the any astronomers, professional or amateur, could help me with a few questions about red dwarf stars. The main query I have is the one heading this thread - what (or which) is the brightest red dwarf that can be seen from here on Earth? Associated questions on this...

Star Wars revolved around the Death Star that could wipe out an entire planet. Another movie is coming up soon so we can start to reflect on it. Can a Death Star weapon actually be built? What could power it? In nature, gamma ray burst can also wipe out a planet...

Since there are many Star Wars and SF fans on PF, I wanted to share some info about the upcoming Star Wars tv series The Mandalorian, scheduled to premiere November 12, 2019. Minor spoilers below (info about setting and background): As far as I know there has not been any teaser or trailer...

Would neutron star cores be a good system to study quantum gravity? Core densities are higher than nuclear material. Is it possible cores exhibit QG effects?

What I’m looking for is some new avenue of physics for a scientist in the Star Wars galaxy to be studying. They probably know what dark matter and dark energy are since Starkiller Base is powered by it. I’m sure they know about how the universe began, why it’s expanding and what it’s fate is...

Hubble's Law and Star Velocity By using Hubble's law and the principle of velocity superposition of relativity, we can deduce when the distance of star from the observation point is (photometric distance)r, its velocity V can be expressed as: V = Csin (Hr/C) Therefore, the...

https://pmt.physicsandmathstutor.com/download/Physics/A-level/Past-Papers/AQA-Old/Unit-5/June%202015%20MS%20-%20Unit%205-2A%20AQA%20Physics%20A-level.pdf mark scheme question 2 very simple question why is the change in wavlength not 656.05 - 656.52? instead. The difference being in the mark...

Summary: hypothetical experiment, how would neutron core behave in such a circumstance such as, if we teleport 1mm^3 of neutron star core from it outside. how would the 1mm^3 neutrons behave? 1. Would it be stable/no change 2. Would it decay into cosmic radiation 3. would it decay into...

I need to understand how to figure out the distance modulus to a star: If the distance of modulus of a star cluster is 12, what is the distance?

Ok, we've got the first trailer/teaser from the next Star Wars Movie, which is named "The Rise of Skywalker": (it looks promising to me, and I hope it will be better than "The Last Jedi" which was a bit disappointing to me) Star Wars: Episode IX – Teaser

Okay I have two questions that I plan to post separately. The first question is simple: what elements will be needed to further space travel in the future? Does anyone care to comment on what base elements would be necessary to build the starship Enterprise? I should explain the reason why I'm...

Hello everyone, here I have one problem, which I can not understand, can you please help me? In attachment you will find a basic star-delta diagram, with unreal calculation (Z is not real value, it's just for calculation and understanding the princip of star-delta). According to these current...

Hello! Dark Matter (if exists)(if it is in form of particles - collisionless) could also be attracted by Black Holes (or Neutron Stars) and form accretion disk. I would like to discuss possible properties of such hypothetical object. DM particles could be trapped and settled in around...

Is it possible for white dwarf star in binary system where it is feeding off its partner star to collapse directly into a neutron star? Or is something inherent in the formation of neutron stars where they must be formed from supernova?

I would like to know, how much a stars life would appear to lengthen relativisticly as observed from earth, if the star was in a close orbit around a supermasive black hole. If the stars lifespan is longer from our perspective than a star of its size should be, would it also appear to be...

Given that a star's lifetime depends significantly upon its initial mass, do we really know what generation the sun is? I'd always assumed it was 2nd (or 3rd) generation, being derived from the exploded remnant of a 1st or 2nd generation star, but given the possible large variability in ages of...

I have heard one theory that Tabbys star dims is due to an alien megastructure. Where would they get the raw materials to build such a large object?

O.K. I'm new here so if this has been answered I don't know how or where to find the answer. I'm not a scientist just a mechanic so if you could explain this simply maybe i can understand it. Maybe ELI5. Light I see in the sky has been traveling for a long time and "is here now". As far as I...

Homework Statement A tight pair of stars orbiting with circular paths at a distance a, the weight of the stars is the same: M1=M2=M What period T and frequency f is the pair circulating? Explain the results generally with G, M, a. Homework Equations Kepler's law M1+M2=a^3/T^2 The Attempt at a...

I have made an effort to answer this question, and would like to know if my thinking is correct. I would appreciate any feedback. Thank you! Homework Statement Two stars in the sky have similar effective temperatures, masses and apparent brightness. However, star 1 has a surface gravity...

I have made an attempt at the question below and just wanted to check if my thinking was correct or totally wrong. Thank you in advance! 1. Homework Statement In a simple model of a star, the density is described as ρ=ρ0(1-r/R), where R is the stellar radius, and ρ0 is the central density...

Hello, I am trying desperately to find the solution indicated in this question : If I compute the equations on the 3 axis, I can't get the flow to be directed along ##\vec{e_y}##. I have only : ##\dfrac{\partial v_{z}}{\partial t} = -\dfrac{1}{\rho_0}\dfrac{\partial \delta P}{\partial...

Hey, I was in my backyard and I noticed a star that was flickering orange, green and white, at about 30 degrees above the horizon, at 8:27 AEST in the afternoon on 20/11. Is it a star or a satellite, and more specifically, which one?

The planet: Distance from star: 0.4 AU (comparable to Mercury) Orbital period: 233 days (comparable to Venus) Mass: at least 3 Earth masses Temperature: -270 F (comparable to Saturn) Barnard's Star: Distance from us: 6 light-years; second closest star system to Sun after Alpha Centauri...

I have problem with an A2 physics question: A planet is orbiting a star at an average distance of 10^9 km. The period of its orbit is 500 Earth days. The gravitational constant is 6.67x10^-11 Nm^2kg^2. a) Calculation the mass of the star. b)Explain why you cannot determine the mass of the...

What powers a star?

A question regarding the redshift of star light being proportional to the star's distance from us. I suppose there were other, competing explanations for this when it was first observed (e.g. that light somehow loses energy/frequency extremely slowly over large distances), in addition to the...

I have seen people talking about measuring Doppler shift of stars to know how fast they are receding from us. But if I measured say a particular frequency f, how do I know whether this is shifted frequency or just the emission?

If I am observing a pinging beacon free-falling into a neutron star from a distance far enough away that I am in approximately flat spacetime, I think I observe the pings redshifting as the beacon gets deeper into the gravity well, in other words I see the clock of the beacon slowing with...

I'm reading section 2.7 of Flanders' book about differential forms, but I have some doubts. Let ##\lambda## be a ##p##-vector in ##\bigwedge^p V## and let ##\sigma^1,\ldots,\sigma^n## be a basis of ##V##. There's a unique ##*\lambda## such that, for all ##\mu\in \bigwedge^{n-p}##,$$ \lambda...

Hello! I'm currently working on a project in which I need to make an animated visualization demonstrating the physical changes and luminosity changes of a star with non radial stellar pulsations. This visualization has to be based on real or theoretical data or a real or theoretical model but I...

A star dies when fusion in its core stops. Presumably this means that there is no longer any fusionable material in the core. Does this mean that there is no longer any fusionable material in the entire star or just that the stuff in the center is used up? For instance, suppose the star stats...

I try to understand the following graphics with x-axis being the radius of a typical star : I would like to knwo if ##\delta c/c## (y-axis) represents the relative error between theoretical and experimental values or if it represents the fluctuations of speed of sound inside. If these are...

So, let me preface by saying I’m neither a scientist nor a mathematician, so am requesting some talented help here checking the accuracy of my source information and math. Regarding star formation, I got curious about how much volume of space in the interstellar medium is actually required to...