Star Definition and 1000 Threads

If a person could orbit close to a neutron star what color would it appear to be? I have always imgained them to be blue, but this might be totally wrong. :rolleyes:

I went to an American Helicopter Society (AHS) DC, chapter meeting tonight. It's full of people who are big in the government and industry. This months guest speaker was with Dell Dailey of the US department of state (He's a former chopper pilot, blackhawks, cobra, and hueys). He said whatever...

I observed a really bright star in the sky a few minutes ago its still there. Its in the west sky low just a few degrees above the horizon. I'm assuming its a planet because i live in the city of London, Ontario which is a pretty large city for Canada. I'm also assuming its Venus...

Homework Statement Neutron stars, such as the one at the center of the Crab Nebula, have about the same mass as our sun but a much smaller diameter. If you weigh 650 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter...

Does anyone know if an average Neutron star with a diameter of 10 miles, was headed towards Earth.. would our Nuclear weapons be able to physically destroy it? Assuming our technology can provide a direct hit, and do it in time. If so, then how many Megatons would the Nuke need to be, and how...

Does anyone know the equation used to find the speed of a distant star?

What is the minimal mass of a neutron star, if the semi empirical mass formula is used?

Here's one for everyone to ponder.. Firstly, this question has always bugged me since I was born. It's not impossible to imagine an Alien civilization 1.5 billion years more advanced than us, using the method of 'Hurling Neutron Stars at 99% the speed of light, to destroy planets and their...

So far i understand that a star many light years away from us can be moving at the speed of light, but this breaks no rules as it is traveling with space. But how about the star's momentum relative to us on Earth, i can only guess as it is moving away from us at the speed of light it's momentum...

Homework Statement In recent years, a number of nearby stars have been found to possesses planets. Suppose, the orbital radius of such a planet is found to be 4.3 times 1011 m, with a period of 1080 days. Find the mass of the star. Homework Equations ? The Attempt at a Solution I...

I was looking for a space time metric that describes the INTERIOR of spherically symmetric rotating stars. However, wherever I look it is always the metric for an exterior of "slowly rotating star" (frame dragging effect) or something similar to it but always the metric AROUND the object...

Homework Statement A star of mass M and radius r rotates with angular speed of such value that objects on the surface at its equator are just about to experience zero apparent weight. The period of rotation of the star is given by? Homework Equations g' = g- Rw[SUB]2 (where w is the...

Homework Statement A star surrounded by a sphere of dust with a radius R. The star emits a short bright flash of light, it is absorbed and re-emitted by the dust. Someone much further away than R sees the light, first at a point on the shell and then in an expanding ring. A)Show that the...

Homework Statement I am trying to describe the limit for the minimum radius of a star to first year university level students in order to describe the reason for the size of the Sun. I'm a bit confused by the critical density of the material in the star's core and how we know that the main...

Star Wars + Legos = Yes I am a big Dork...whatever. I still think this is COOL. Sweeeeet. That's freakin awesome. http://www.flickr.com/photos/23575410@N05/ That kid must have spend a few grand on that. Legos are $$$ expensive.

Determine the average density in solar units of a 0.5 solar mass star with effective temperature 20000K and luminosity 0.03 solar luminosity. I don't know what the relationship is that I have to use, I have tried using this: rho = 3m/(4pir^3) and mixing it with other equation but I...

In my problem, it says only this: "The star Arcturus culminates. What is the sidereal time at this moment?" Do I need to know when the star culminates to solve the problem, and if I do where would I find this information?

Homework Statement A microwave detector is located 0.5m above the surface of a large lake far from the shore. As a star, emitting monochromatic microwave radiation of 21cm wavelength, rises slowly above the horizon, the detector indicates successive maxima and minima in the signal...

Homework Statement A planet is in a circular orbit about a star that explodes, shedding 2% of its mass in an expanding spherical shell. Find the eccentricity of the new orbit of the planet, which otherwise is not affected by the shell. Homework Equations \sqrt{1-\varepsilon^2} =...

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?