Star Definition and 1000 Threads

I don't mean a black hole, I mean an actual functioning star that is black to our (human) senses. What that would mean is that a star that is so hot, that it produces hardly any radiation in the visible part of the spectrum, nothing lower than ultraviolet. I mean it's possible from the other...

So basically I have to find out star locations for a school project and one of the stars is called V1. So I looked up the name and found this link(https://www.nasa.gov/mission_pages/hubble/science/star-v1.html) but no location. I can't tell if I'm just stupid or missed or something, but i have...

Is our Earth's sun is a dwarf star?

what is the goldilocks range from a neutron star?

Hi, Please not too many sighs but I'm stuck with this my miracle realisation - the scenario is - I'm in a rocket (tons of fuel ) - I blast away (from Earth say) - accelerate hard for ages and by my special onboard inertial calculator I have got to 100 000km/s (with respect to earth). Switch the...

Hello, in article Slowly relativistic stars by James B. Hartle (http://adsabs.harvard.edu/full/1967ApJ...150.1005H) is equation of Newtonian hydrostatic equilibrium, eq. (5). $$const.=\int_0^p\frac{dp}{\rho}-1/2(\Omega \times r)^2+\Phi,$$ where ##p## is pressure, ##\rho## is desinty, ##\Omega##...

Hello, I just try to make photo (quite amateur) of Vega and Arcturus (by 76 mm scope Newtonian) If you like watch it ...

Instead of Matter being destroyed and re-created; what about transporting through a Warp Bubble? I will dumb it down for others that wish to learn...Bubble Theory: Can you transport via a Warp Bubble as opposed to a Destroy and Recreate Premise?

new scientist July 15, 2017 current issue has article on boson stars, objects with the size and mass of stars, but composed of bosons. boson stars could mimic black holes. that got me thinking. if you had glueballs gravitational bound and the size and mass of a neutron star - or even larger -...

Just read an article about a discovery of the smallest/least massive star in the Milky Way galaxy. The star has 85 times the mass of Jupiter and is known as EBLM J0555-57Ab located about 600 light-years from Earth. The entire article here -...

Do all stars orbit around the black hole in the same plane? Or some stars can have the same orbital radius but slightly different orbital inclinations?

Hi there... I have a question about the tipical mass-radius relation plot for a neutron star, something that looks like this for different equations of state: My question is, what is exactly happening at the ends of the EOS lines? I know that after passing the maximum mass the curve starts...

Greetings, I wonder if someone could please kindly give a physics explanation for the phenomenon of circular star trails when Earth is moving 67 times faster laterally than it is rotating? Thanks very much in advance...

Hello I am interested about correlation between star surface temperature and its visioned colour ,for example orange red Arctur has surf temperature cca 4300 K ..but comparing to for example hot piece of metal? its temperature 2000 K respond white colour. ? What is a matter of this disagreemet...

Is there a guide, based on existing evidence, that I could use to infer realistically how color would be affected on alien worlds due to factors like star class, luminosity, atmospheric composition, etc? I'm planning to develop a not-too-too-distant future scenario where all the stars in...

I was passing time by Googling the properties of the sun (temperature, mass, etc) and got to wondering what lies at the center of stars. I found out its plasma under roughly 340 billion atmospheres of pressure. I realize Boyles law may not be strictly meant for plasmas, but using it I...

Homework Statement Homework EquationsThe Attempt at a Solution [/B] Honestly speaking I have absolutely no idea about this problem . This is the first time I have seen a problem of this nature .I am not even sure which chapter of Intro Physics text does this problem belong to . I would...

I am a casual follower of physics and was recently watching a YouTube video on Neutron stars. I am looking for a "simple" answer to this question. Per the video when the star collapses with the right mass to form a neutron star, at some point gravity forces electrons into protons and flips an...

KIC 8462852, aka ‘Tabby’s Star’ is in the news again, with more BS ideas about "alien megastructures'. Isn't the simplest and most likely explanation for the intensity variability that it is a binary or multiple star system and that the Earth is in the same plane as the mutual orbit ?

I need to run some computations using an initial star. I could evolve one using MESA but it'd be very convenient if I could download a ready made profile/model of a star which details things like mass, dens, temp, etc, from core to surface. I've googled for a long time but I just keep getting...

Today is May 4th. I used a vacation day (I've got a quite a bit saved up) and am home watching the Star Wars movies in machete order. Just curious if anyone else is celebrating this sacred holiday and if so how?

What is your favorite Star Trek series and why. Who was your favorite character? I go with Next Generation because it's what I grew up on however Spock as best character.

Homework Statement Consider a rapidly rotating asteroid with an albedo (reflectivity) averaged over the solar spectrum of 0.05 that orbits around a 3 solar mass star that has the same surface temperature as the Sun. The asteroid’s orbit has a semi-major axis of 15 AU. What is its equilibrium...

This is the problem given at my basic astronomy course. If I turn it in within a month correctly, I get 10 extra points in the finals. Problem: We have binary star system consisting of Star A and Star B. Astronomers have observed it for 11 years, during which it has moved from point A to point...

Ok, the next Star Wars, Episode 8, is named "The Last Jedi" and here is a brand new teaser, the first I think. "Star Wars: The Last Jedi. Arriving in your galaxy December 15."

Homework Statement Neutron stars are thought to rotate at about 1 revolution every second. What is the minimum mass for the neutron star so that a mass on the star’s surface is in the same situation as a satellite in orbit, that is, the strength of the gravitational field equals the centripetal...

A gamma ray burst radiates an enormous amount of energy. Could it blow up planets like, let's say a Death Star can if they were close enough? I can imagine that, since grbs are able do destroy an atmosphere while being light years away.

I'm trying to write some code to generate plausible star systems, but so far, I only have a main sequence star generator, and even with that I don't know how good the mass-radius relationships are. So, I'm coming here to ask for some formulas or pointers as to where I can go to find the math to...

1. Question Suppose you examined the spectrum of some nebulosity surrounding a main-sequence spectral-type O star and found that it contained no emission lines, only the continuous spectrum of the star. What conclusions could you draw about the nature of the interstellar material around that...

Wikipedia(https://en.m.wikipedia.org/wiki/Photon_sphere): 'This equation entails that photon spheres can only exist in the space surrounding an extremely compact object (a black hole or possibly a neutron star)' But how can a neutron star? I have a doubt because 1. When а mass of а star...

I have a question, it has to do with the formation of stars and how it is triggered. I was reading that any given stellar body with enough mass would collapse into a star, does this mean that any type of matter you put in space regardless of what it is, given the correct conditions will turn...

Suppose we are watching a star that is spehrical. But we will see its one face that is toward us(suppose its not rotating). We will see that face to be plane circular. Is there any way we can find the curvature? or tell if its spherical or disk shaped ?

Hi, My textbook has a multiple choice question about which stellar object has the highest surface temperature and the answer was a white dwarf. However, one of the options was a neutron star. Neutron stars are much denser and have been crushed by gravity even more plus they are rotating at...

How can planets exist in star systems with two or three stars? Shouldn't the planets' orbits get severely disturbed by the other stars?

Imagine someone in a planet at the farthest star of the farthest galaxy from ours. From that planet would the sky be a half black and the other half full of galaxies? Could a star be at the "edge" of the universe or general relativity contradicts that?

I've run across a Lie group notation that I am unfamiliar with and having trouble googling (since google won't seem to search on * characters literally). Does anyone know the definition of the "star groups" notated e.g. SU*(N), SO*(N) ?? The paper I am reading states for example that SO(5,1)...

Although it is definitely not simple, there are many reasons to consider that baryon number can be violated, for example: - while baryogenesis there was created more matter than antimatter, - hypothetical Hawking radiation can finally turn any matter (mainly baryons) into massless radiation...

If a neutron star can be seen dense enough in some inertial frames of reference (due to relativistic length contraction) to form a Black-Hole, but not in others, how could the two realities coexist? Thank you in advance.

Hello everyone. I'm looking for an good equation of state for a neutron star, I'm starting with a degenerate neutron gas, but i have nothing to compare my results, I've search on the internet for it but haven't success. May you guys could have any graph of it to help me ? Thanks a lot.

Is Iron the heaviest element a star will fuse through nuclear fusion or will it continue to Iron into a heavier element.

Homework Statement For a balanced star connection i have given angles for V1=90 V2=0 V3=-90 i have to find the voltage required to produce the same phase currents as in standard three phase voltage source e.g V1=120 V2=0 V3 =-120 Homework EquationsThe Attempt at a Solution Im not even sure...

I'm still trying to understand the concept of the slower passage of time at or near the speed of light. Say for example we had the technology to travel this fast and wanted to send astronauts to visit the newly discovered planet Proxima Centauri b four light years away. My understanding is that...

This new star which supposedly formed 1800 years ago and which will become visible to us in 2022 is not shown in Stellarium. Is it generally accepted among astronomers that this new star will enter our sky in 2022?

Hi, I frequently see statements that meteors are due to a grain of sand, "Most meteors typically measure 1m across and 20km long, and consist of a cylinder of excited atoms and molecules. They are normally seen between 120 and 80km above Earth's surface. To produce a meteor, a meteoroid...

Homework Statement In an visual binary star system,the apparent magnitude of the primary star is m=9.8 and its spectrral type is G2V.The angular semi-major axis is φ=0''.1 and the period of the system is 24y.Find the distance of the system r and the two masses.The Sun's absolute magnitude is...

Homework Statement In a binary star system, the centre of rotation of the system coincides with its centre of mass. If the two centres do not coincide, there arises a net moment and the system will collapse.Homework EquationsThe Attempt at a Solution But refer to the photo, isn't Fh = Fh , so...

Since gravity is stronger the closer you get to center mass, is it possible some neutron stars have a black hole inside?

Homework Statement Spherical,homogeneous star with radius R orbiting black hole at distance ## r_p >>R ## .Derive the tidal force acting upon the star by dividing the star into two equal parts and making the necessary approximations. Homework Equations The tidal force equation of ## a \propto...

Hi I am a new member, I felt compelled to find a forum to talk about what i have been watching in the night sky. I have been watching the sky most evening now for the last couple of weeks, since one Saturday evening around 12pm I noticed what at first sight looked like a plane siting in the...

Are there any stars in the solar neighborhood that orbit the galactic center in the opposite direction?