Astronomy and Cosmology

Hi there, I came across a thought that does earth makes sound or noise during it's movement because every moving element does make sound or noise during it's movement.. Thanks for your views...

Can someone explain how it is possible that the speed of light is constantly 670 million mph irrelevent of relative speed? how is it that you can be going 669 million mph yet light still accelerates toward you at the same rate??

The universe Black holes create a hole into the outsides of the universe, where there is either unlimited, or limited energy. Once it goes into it, it turns into dark energy. After turning it into dark energy, it goes into the universe by a worm hole. Worm holes then would release dark energy into space. It is impossible to go into a worm hole, it can only throw energy out, while black holes can only throw energy in. While this happens, the universe never ends, only gets bigger, because black holes can only take in so much before collapsing. Worm holes can come anytime for a certain amount of time. At that time a certain amount of dark energy could be expelled. Basica…

Hi there, I have seen surface tension on the water surface on earth does it exists on mars too? Thanks.. for help

In my eyes, there are 4 possible ways we got here: 1. A god spontaneously came to be and made everything. 2. The universe spontaneously birthed itself ie. Big Bang 3. A god is infinite and eternal and always existed. 4. The universe is infinite and eternal and always existed. Points 1 and 2 I feel are impossible. I do not feel something can come from nothing. You can argue that an all powerful god can do anything, but that god would not have existed to be all powerful. I also dont feel that the Big Bang makes sense either in its traditional sense. In order for a "big bang" or "expansion" to occur, something had to be there to "bang" or "expand". Po…

What would happen if two neutron stars collided? what effect would that have on the surrounding space? if i remember correctly, neutron stars are extremely dense, so two colliding would probably cause a shock wave of some sort. assuming they collide at high speed. Also, Don't neutron stars usually collapse into a black hole?

If a civilisation living on a planet orbiting a nearby star a few light years away detonated a 50MT thermonuclear bomb in space near the planet with direct line of sight to the Hubble space telescope, say, would the explosion be detectable by Hubble in any way (visual, gamma ray burst, infra red, x-ray)? (assuming we knew it was coming and were ready for it). And if so could they, and us, use this method to communicate with each other in a form of nuclear "morse code" using several bombs (albeit with a 4-year period waiting for the reply). I presume that no lasers or other man-made radio waves could carry that sort of distance and still be detectable? If you p…

Can anyone tell me if I am reading these guys wrong or if the writers got it wrong? http://news.yahoo.com/s/space/20070109/sc_space/pillarsofcreationtoppledbystellarblast The part I have trouble with is: What I don't get....if the light of the nova has hit our sky 1k-2k years ago, wouldn't the light the hubble uses to take these images build photos of that nebula 1k-2k post-explosion? If the light of the nova-event has passed us, then all light containing images of pre-nova conditions has passed by us - by a long time apparently. If we can still see the pillars even through they are gone, then the bright flash of the nova should be in the future right b…

Hey, QUESTION: I was wondering which are harder to detect and why, comets or asteroids? I heard that asteroids were harder because they can't be seen in the 'blindspot' (the space in betwen the sun and the earth), but I also heard comets were harder... Can anyone give me some help?...At least to back up the comet-claim? Thanks man

Einstein's general theory of relativity was accepted once astronomers observed the bending of light from a star during a solar eclipse. So gravity bends light. How do we know that the stars we see at night are really in the locations (or directions) that we see them in? That is, if the light from these stars have travelled hundred, thousands, or even millions of light years, wouldn't their paths have been bent and warped several times over by nearby gravitational sources? In which case, they would most likely not be located where it looks like they are. So how do we know where the stars really are - and if we have some way of knowing, how much does the light from …

we add a day every 4 years, because a year is 365.25 days long. now that`s fine, But it`s actualy 365.2564! so how come we don`t add 3 days every 500 years? or 1 day every 166 years etc...

Long-term space residence has long been a "maybe one day" dream of Nasa's, simply because the lack of gravity makes it very difficult to excersise in space, so people's muscles and bones would gradually deteriorate (it's amazing how much excersise you get just sitting here resisting your own body weight). However, there are other forms of resistance besides weight due to gravity. A good example is magnets. Magnetic charge is much stronger than gravity, as is demonstrated when you hold a magnet a few inches above a metal pen and the pen jumps up to the magnet. Maybe we could make small chips of magnetic metal in all the astronaut's clothing, and make the floor the o…

I just read Lyndon Ashmore's "Big Bang Blasted" He presents a very compelling case for a different, simpler and I believe, correct interpretation of Hubble's law and the cause of redshift over very large distances, as well as the source of the CMB. Of course it brings us back to square one as far as how the universe was created, but that's part of the fun of science right? In a nutshell, he first noticed that Hubble's constant as of the most recent measurement, happens to equal the electron density in intergallactic space. This seemed to coincidental to be happenstance, so he began to look into the issue further and although I wont go through the derivation …

There's gotta be one. Anyone know what it is? thks

Hey everyone, I have a question about the start of a black hole. I read this in an article on the internet but it was a bit vague and I didn’t quite understand it and I was wondering if someone could help me understand what it said. Basically it said that a black hole could be caused by an electron being pulled into a proton by its gravity which causes the atom to become unstable and it collapses in on itself until it becomes a singularity. It sounded a bit weird to me but I’m really interested in black holes and I want to learn as much as possible about them so can anyone expand on it for me? Many thanks

I'm an aspiring astronomer/astrophysicist/etc who is about to graduate from high school and go to college. The problem is that I was just searching usajobs.com and monster.com looking for jobs as physicists, but the only ones I could find were "monitering CIA sattalites" or "drug chemists," none of which interest me in the slightest. It made me think for the first time: What if I can't find a job to match my future PhD? Does anyone know where I might find a job as an astronomer or an astrophysicist or a quantum mechanic? Or rather, would I be more likely to land a job as a professor at my university? If so, would I need to double major with a teaching degree like a …

A thought occurred to me, a star is formed by a large mass of hydrogen collapsing under its own gravity right? So how then do we get different size stars, because wouldn’t the hydrogen cloud collapse when it reached a certain mass making all stars the same size because they all started with the same amount of hydrogen? Somewhere I’m wrong because there are lots of different size stars so can someone tell me what I’ve got wrong? Many thanks

Hey everyone, I need a bit of advice and I was wondering if anyone could give me some. I really want to study astronomy but I’m not sure how to go about it. I live in England and I don’t know how education works in other countries but all advice would be much appreciated. I was wondering if anybody knows if I can study astronomy at and A level or BTEC, or would I have to do and A level in physics and then study astronomy and university? Also, what kind of job opportunities do the qualifications offer? And encase your wondering I’m only 17 and about to finish my current college course and still don’t know what I’m going to do next academic year.

Hey guys, first timer here in need of a few answers. First off i'm 17, I absolutely love space, the stars, plants, galaxies, nebulae, everything just fasinates me. I'll be moving into the working world soon, and after I buy a laptop a telescope is next on my list. I have never had one but Would be thrilled to own one. My problem which I present to you is what should I look for? What I am looking to get out of it is to be able to see the moon, other planets, stars, nebulae, and anything else possible. Also, me being a novice, it would be handy if it auto-located the stars, planets, etc.. I am also looking to be able to take pictures from the telescope, and I ha…

Helioseismology has taken another step, and could have benefits for communications and future space missions. I watched an interview on BBC breakfast whilst having a day off work, the UK involvement was why it was mentioned, very interesting, please see the BBC article below... http://news.bbc.co.uk/1/hi/sci/tech/5217080.stm

For some unknown reason to me this forum has said I've never posted well I did say Hi to all yesterday so Hello again...us2u

I know all the current thinking & evidence on the origin of the universe is the Big Bang theory but why , with such an immense amount of matter & energy was not the energy for expansion of any mass within it infinite & why was it not a vast black hole in its early stages ? Infinite means infinite as per Einsteins equtions -- or does it ?

Ive been thinking a lot. I dont think any of the theories work. The Big Bang Theory says that the universe just suddenly is created by one atom and time and space was not created. The Steady State theory says that it has been expanding. The other one( that elctro thingy) says that it is made from electricity and magnetism or something. Any1 got a clue how the universe began because i dont agree with any of these theories!!

As far as I know it's a commonly accepted fact that the earth is gaining 100 to 200 tonnes of mass / day because dust and small meteorites hit our planet. This happens mainly because it "gets in the way" and is scooped up by our planet like snow on the front side of a driving car, rather than beeing sucked in by the earths gravity. Since earth apparently grew much faster in its earlier stages, billions of years ago, I suppose the growth rate has been slowly descending as our solar system has been sucked clean by Jupiter and the other planets. But how fast has it been growing over - say - the last billion years? Was earths gravity notably smaller in cambrium or the cr…

"there are no features that distinguish one black hole from another, other than mass, charge, and angular momentum." (http://en.wikipedia.org/wiki/No_hair_theorem) Electromagnetic energy transfer happens through transfer of photons, right? And even photons can't escape from a massive black hole. How is it possible to measure the black hole's charge? Are my fundamentals all wrong again or am I missing something very important here?