Star Definition and 1000 Threads

If this is true, could someone please tell me, if a grain of sand represented the size of an average star what would be the average distance between every grain of sand to give a approx size to the universe.

Hi I've just started a new Electrical Course and have been working through an old exam paper but i got a bit lost when doing the star connection question - see attached for question and work done would just like someone to tell me if any of what I've done is correct and where I've gone...

Homework Statement The mass of a star is 1.51·1031 kg and its angular velocity is 1.50E-7 rad/s. Find its new angular velocity if the diameter suddenly shrinks to 0.49 times its present size. Assume a uniform mass distribution before and after. Icm for a solid sphere of uniform density is 2/5...

i got part a, but i can't get part b! 1. A star has a mass of 2.96 x 10^30 kg and is moving in a circular orbit about the center of its galaxy. The radius of the orbit is 3.3 x 10^4 light-years (1 light-year = 9.5 x 10^15 m), and the angular speed of the star is 1.6 x 10-15 rad/s. (a) Determine...

I have this shooting star picture, and not sure if it's a fake. Have you got any ideas?

Star with negative pressure? Is it possible to have a star with matter with unusual equation of state. Will it be possible to have a star with negative pressure.

How do you find the mass of a star based on its diameter? are there other factors that play into it and other things like that or is it just an equation?

HELP...The Azimuth and Altitude of Star Vega What is the azimuth and altitude of the star vega because i am not sure I got the right star so could anyone help me? over the course of three days does the Azimuth and Altitude stay the same of is it different and why? Secondly... What...

The star that I am looking for is Polaris. I Need to know the azimuth and altitude of the star polaris for a 2 hour period checking it ever fifteen minutes. I am in Middle Tennesse. Tonight (09/6/08) I come up with an azimuth of 20 degrees and the altitude was 77-78 Degrees. Can someone tell me...

Homework Statement The star that I am looking for is Polaris. I Need to know the azimuth and altitude of the star polaris for a 2 hour period checking it ever fifteen minutes. I am in Middle Tennesse. Tonight (09/6/08) I come up with an azimuth of 20 degrees and the altitude was 77-78...

I have always been facinated with the stars. I have never been actually able to identify them though. I guess I hadn't much care considering they all look quite similar to the naked eye. Today I was outside looking at the stars, and though there were a number of stars out there, the house...

I've come across a proof for star-delta transformation which goes like this.(Refer to the diagram for notation. Pardon me for my bad drawing skills.) In the delta, he found the effective resistance between two vertices ( say a and c, which can found easily). Then he found the effective...

Why is there so much of Star Trek on the " manly " Spike channel?

Hi all, My question is, does the radius of a star vary significantly between different wavelengths? I am particularly interested in the 100 nm to 100 micron range. I found a paper by Paul Swanson on the radio band radius, but so far can find nothing which compares optical and infrared...

http://space.newscientist.com/article/dn14435-universes-first-stars-bulk-up-in-new-simulation.html The new computer simulation study suggests that early stars tended to be quite large, order of 100 solar masses, implying short life. The possibility is mentioned that the James Webb telescope...

One of my all time favorite episodes of TNG will be on the sci-fi channel tonight at 7PM CST. Picard is knocked unconscious by a probe and lives another man's life on a long dead planet. This is the show where he learns to play the recorder.

I have a question about the hydrostatic equation for a star's central pressure. I know that the central pressure for a star is, \dfrac{dP}{dr} = \rho \dfrac{G M}{r^2} My question is: why does this blow up at r = 0? Because of the singularity, I'm not sure how I can integrate the equation...

sorry about the fantasy factor here guys, but having a kind of barrier that can repel mass and be "mass less" without having any visible infrastructure would be quite valuable. so the question is: What are force fields? (like the ones in star trek) what would they compose of? and what keeps...

A neutron star cannot spin with less than a certain critical period, or else it will start to lose mass from its equator due to the “centrifugal” force. Estimate this period.

Where can I get some data for Binary Star system? Thanks in Advance

Homework Statement Given the density function \rho = \rho(r) calculate the pressure at the center of a star. Homework Equations F = \frac{GMm}{r^2} P = \frac{\Delta F}{\Delta A} The Attempt at a Solution Choose some radius r. Then the gravitational attraction there is...

Hi, Say we had two identical stars one light year away from us, but one is stationary and the other is receding from us at 0.8c. What would be the apparent brightness of the receding star relative to the stationary star? I think at least two effects would have to taken into account. 1)...

Does exists Syrius c? Why Syrius in the past was a red star?

When our star the Sun finally accumulated enough matter for fusion to start what would that have done to the planets around it? Afterward what would have happened to the Earth for it to get from when the sun started fusion and blasted the Earth and now, with water and atmosphere?

Can someone tell me how much does a light ray bend when it passes over the surface of the densest star known? Is it like 1 degree, or more like 30 degrees? Please leave out black holes, this question is about normal stars, the densest one that is known. Is Sirius the densest normal star...

Homework Statement A distant star at rest with respect to an observer on Earth emits light of frequency 6.690 x 10^14 Hz. The star breaks up into two remnants of equal mass, which are observed to emit light of frequency 7.135 x 10^14 Hz and 4.282 x 10^14 Hz Find the velocities of the...

If the orbit is an Hyperbola, the celestial body could to return tho the star for another perihelium?

Hey! What would happen if you were orbiting a neutron star and shot a powerful laserbeam at the surface, at some angle? Would it reflect? Would it be absorbed? Thinking (if you picture the star as a perfect neutron star) that the surface is absolutley smooth, it would reflect light...

How can we decide which process is causing light to bend near the surface of a star? Gravity is said to cause light to bend or deflect as it passes near the huge mass of a star. But matter in the troposphere of a star should also cause light to bend or deflect as it passes through the...

Homework Statement 1) Astronomers discover a binary star system that has period of 90 days. The binary star system consists of two equal mass stars each with a mass twice the sun's. They rotate about the center of mass at the midpoint between them. How far apart are the two stars? 2)...

Cepheid variable star? How was Hubble able to determine that one of these stars was within what was then called a nebula? You're telling me that back in the early 1900's, he was able to detect a single star within a distant galaxy?

Homework Statement A neutron star has a mass of 2.0 x 1030 and a radius of 5.0 x 103. Suppose an object falls from rest near the surface of the star. How fast would it be moving after it had fallen a distance of 0.010 m? (Assume that the gravitational force is constant over the distance of the...

I was reading some articles on the internet, about scientists being able create space ships capable of nearing the speed of light, some time in the future. So say they did do this and managed to reach around 0.9999999% of the speed of light and wanted to travel to the nearest star which, to keep...

The mass of a star is 1.4 × 10^31 kg and it performs one rotation in 26.3 day. Find its new period if the diameter suddenly shrinks to 0.55 times its present size. Assume a uniform mass distribution before and after. I don't know what I am doing wrong here: Iw(intial)=Iw(final)...

The laser is able to vaporize an Earth sized planet in about a second.

This is the first time I am posting here. I thought I whould show this website as a way to introduce myself. I'm interested in anything dealing with science, especially cosmology. I have always liked showing this website to everyone because it really shows how small we are...

[SOLVED] Binary star system and Apparent magnatudes I was asked this questing in my tetbook and can't figure out how to do it. Suppose there is a binary system made up of two identical stars, each with an apparent magnitude of +4.1. However, from our 40 cm telescope they appear as one star...

The mass of a star is 1.170×1031 kg and it performs one rotation in 28.30 day. Find its new period (in days) if the diameter suddenly shrinks to 0.610 times its present size. Assume a uniform mass distribution before and after. How do I even start this problem? Can anyone give me step by...

I'm a writer working on my first novel. The genre is science fiction and I'm trying to keep the science part of it as close to the realm of possibility as I can. The setting is in a smaller system about 10 to 50 light years of our system. Can someone name a star and its location that is of...

Homework Statement A certain triple-star system consists of two stars, each of mass m = 7.00×1024kg, revolving about a central star of mass M = 1.69×1030kg in the same circular orbit of radius r = 2.00×1011m(see the figure). The two stars are always at opposite ends of a diameter of the...

http://www.stuff.co.nz/4426392a10.html Is this for real? I am somewhat sceptical of anything of a technical or scietific field that I read in the mass media.

Homework Statement Hey all, I need a help to determine the Mass-Radius relationship for a neutron star. I've done it for a white dwarf, but for a neutron star I need to know the Neutron degeneracy pressure expression, can anyone please help me to solve it? I am thinking that if I have...

Hey all, I need a help to determine the Mass-Radius relationship for a neutron star. I've done it for a white dwarf, but for a neutron star I need to know the Neutron degeneracy pressure expression, can anyone please help me to solve it? I am thinking that if I have the n.deg.pressure...

An object orbits a star, both items comprise the system. I am looking for confirmation of a couple of concepts regarding orbits. As the object slows down, does the kinetic energy of the system decrease, and does the total energy of the system decrease? As the kinetic energy of the system...

Is there a simple-model equation for the radial density of a neutron star, from core to shell? I assume there have been models of fermionic gases, anyone have something onhand Is it a specific distribution? Linear? 1/r^2? I know its just a balancing of gravitational potential with strong...

Recall in Star Trek the next generation and of the new series, they use replicators and holodecks. Many science degrees work hard in all fields of knowledge. In the future technology will mature and that kind of science may be real. How do you think society will react this scientific...

I am looking for a general approach for a type of problems as follows... Certain circumpolar star has a maximum azimuth A given for example as an angle from North to East and from North to West. Whats the declination of that star? The problem looks like this: draw a celestial sphere and...

Looks way more fun than what I've been doing... http://www.theage.com.au/news/national/now-for-star-treks-enterprising-thesis/2006/08/27/1156617211732.html

[SOLVED] Apparent magnitude of binary star? Homework Statement A binary star has a total apparent magnitude of 15.00. One component star is twice as bright as the other. a) Show that the apparent magnitude of the brighter star is 15.44. b) The fainter star has an apparent magnitude of...

Right I've got an exam at half past 4, tomorrow on a Saturday! I've spent the past few days doing past exam questions and a lot of them I'm able to do or at least work out for myself after a bit of time. Here's a couple I'm really stuck on so some help would be really really appreciated...