Astronomy and Cosmology

What I mean is Doppler redshift is caused by the motion of the source away from the observer, and the Cosmological redshift if caused by space expanding. I read that distant galaxies doesn't move, it is space that expand. Why ? Why do we say that the galaxies doesn't move. Is there something special in the redshift ? Thanks

I have been "messing" Wien's law and the ionisation energies of Hydrogen and Helium to see of I can get a very naive guess at how hot stars are. Interestingly I get a temperature that is much higher than typical stars on the main sequence, but they are just within the range of the hottest stars observed. My approach was to assume that the temeperature of the star's surface is about the first ionisation energy of Hydrogen (13eV) and then Helium (25eV). This would be the "worse case scenario", atomic collisions would lower this temperature dramatically. I assume this as the photoshere of stars consists of plasma. This gives a surface temperature of 150,865 K and 290,1…

Hello, I am characterising comet tails. I am not using a specific software for that, just Photoshop. I got problems cause when calculating the lenght of the comet tail, there are some fragments that are far away from ... how to say it... the main tail, that is intensively green. What should I do? Should I include them in the lenght of the whole comet? I am doing this for the first time and I will apreciate help of any kind.

According to Astrobio.net as the Moon passes through the Earth's magnetic field, it receives static electricity. These electrical charges are projected to start increasing in intensity by the year 2012. Since NASA has decided to attempt to make a long standing presence on the Moon by the year 2020; this may affect Moon Missions. http://www.astrobio.net/news/modules.php?op=modload&name=News&file=article&sid=2303&mode=thread&order=0&thold=0 How is the Earth's magnetic field different from other planets? And how might this event effect us? Everlasting Futuristic Science Fiction Novel Moon Over Key Biscayne

Water has been found on an extrasolar planet, according to the bbc... http://news.bbc.co.uk/1/hi/sci/tech/6544257.stm

http://science.nasa.gov/headlines/y2007/07may_bigsupernova.htm?list45222 "Of all exploding stars ever observed, this was the king", said Alex Filippenko, who leads two of the observation teams involved in the discovery. The star that exploded was 150 times as massive as the sun. The explosion occurred in another galaxy, 240 million lightyears away, not in our Milky Way galaxy. A new explosion-mechanism has been proposed, that applies only to these very massive stars. By this mechanism, unlike other supernova models, the star can explode BEFORE it has exhausted its fusion fuel.

I was just watching a documentary on the Science Channel about how the benifits of colonizing Mars were arguable. Some say it's too far, dangerous, and expensive to walk on Mars as we did on the Moon in 69. I swear, I'd like to meet these people, so I can kick their ass. It makes all the sense in the world to walk on Mars! It could be the answer to our natural resources problem. It could answer once and for all if there is life out there. It could give us an entire planet's worth of land to colonize, greatly reducing our population density crisis. There's a million trillion reasons to walk on and colonize Mars. Seriously, how can the benifits of human explor…

if i will get remark-its will help me to understand what do you think, maybe i am wrong or maybe i am just,but i am give a new point of view-so post replay sometime it is significant,and sometimes it is good to know just people have an idea about this-thank you for the attention cohen avshalom charly isreal/haifa http://www.icarus5.com

It is a matter of belief in one theory or the other, maybe you think string theory is right, maybe you think quatum loop gravity is right, the test of these theories are all ways open to dispute, when will we have tests that show these conjectures are just so right or wrong? I dare say that the grant system will suppress any new thinking progress in the understanding of our universe.

The 2006 Nobel Prizewinning discovery of the Blackbody Spectrum form of the cosmic background radiation has revolutionized our view of the universe. Big Bang Cosmolgy has triumphed magnificently. Humankind's view of the universe has been set in concrete. A great many competing ideas have been consigned to the junk heap of science. Not so fast! I believe that this discovery is a result of science fraud at NASA, and I make this public allegation in the following online article: THE GENESIS COVENANT Is the Big Bang Blackbody Bogus? AN INVESITGATIVE REPORT OF SCIENCE FRAUD AT NASA

Can any one name one thing that has increased our knowledge of how the universe began or how it came into existence? When i say (KNOWLEDGE), i mean anything that has a 99% CL. or may be we can go in decending order of CL but, nothing below 95%.

I admit i have reached a dead end in my search for a Dark Matter candidate, is there some one who has a deeper understanding of the topic ,and is willing to enlighten me with his/her knowledge as to what Dark Matter is?

Most exoplanets found so far are far more massive than earth (Jupiter-size). And many have close-in orbits presumably making them hot. So it's interesting there is a report of detecting an exoplanet that not only is NOT close-in----it is between Mars and Jupiter distance from its star----but also is a modest 5.5 earth masses. http://dabacon.org/pontiff/?p=1176 http://www.nature.com/news/2006/060123/full/060123-5.html NATURE says:

Could anybody who is familiiar help me with some details of doppler red shift? In the calculation for velocity of an object(say galaxy) ,do we consider the direction of motion of body.I will explain Object receding will form a red shift. Object approaching will form a blue shift. What about an object moving at an angle with the observer.Of course the value of shifting will be different. Do we give any consideration for this while calculating velocity? for example, If the observer is at right angle to the direction of object,he will recieve signals without a shift????

Hi everyone. My interest is mainly cosmology and i would love your views on its progress/lack of. From what i can discover string theory and quantum loop gravity do not as yet work. Dark matter and Dark energy are yet to be discovered, (reading between the lines) Dark energy seems to be an unwelcome addition to cosmology. The Higgs boson, the graviton ,predicted by some theories remain undiscovered, (but are ever more constrained). the same with gravitational radiation. In short it seems every way we try to explain our universe comes up against obstacles that are as yet uncrossable.

Expanding earth! Why isn't this theory the official theory of how the landmasses look the way the do today? I mean, anyone with a brain, some logic, and a open mind knows this must be the case. I came across a good movie that explains this.

Hello... I want an information of Big Bang Theory. If yoy have ; Post in this topic or Send to my E-mail. E-mail: arvinsoft@gmail.com

The 'Ugly Head' of Einstein's Abandoned Cosmological Constant Newton asserted ‘Hypothesis non fingo’. - ‘I make no hypothesis’. Yet, his entire, unarguably revolutionary Classical Mechanics was based on the hypothetical 'particle' that science has yet to assuredly accommodate. The ‘particle concept’ that dominates physics and the vast majority of colloquial human thought: has never been proven beyond hypothetical, quasi-scientific retainers. ‘The (rarely) indicted ‘particle’ Isn’t found ‘wrong’ here, but rather: resiliently incomplete; so as to aggressively exclude the incumbent role of the continuous field in the corporeal balance of material considerations. - K. B. Ro…

Hi everyone, Out of the 90 extrasolar planets found so far only one planet has characteristics similar to earth and others being gas giants like Jupiter which are not much interesting.This earth like planet is 55 light years away from the earth and what's interesting is this planet is right in the middle of the habitable zone. So could this be the first planet where we will find some amazing life in it? I very well remember that life depends on lot of factors to originate on an alien planet.

In the NY Times yesterday or so was a great picture of a large hexagonal cloud structure about one of the poles, having a scale of 15,000 km.

Astrobio.net is reporting that NASA is planning to make a long standing presence on the moon in 2020. http://www.astrobio.net/news/modules.php?op=modload&name=News&file=article&sid=2282&mode=thread&order=0&thold=0 Any take on the results? Everlasting Futuristic Science Fiction Novel Moon Over Key Biscayne booksandmore.4t.com

Hey, many things have been growing in my mind these past years. I just thought i'd share one of them with you to see your opinions on the matter. Think about this, The universe must be everlasting (Distance-wise), So do you really think there could be another world? Just like ours... Maybe more advanced or less. Maybe there is millions, And will we ever find out? If you think about it, there cannot be just one world, Being us, it seems theoretically impossible if you think of the vast space in the universe. Will we find out one day? or is it going to be an Unsolved mystery? Thats all i can right at this present in time, I have to run. Cyaaa soon.

I was reading http://www.space.com/scienceastronomy/distant_galaxy_040216.html stating that they found a galaxy at about 13 billion light years away. I am trying to figure out what that statement means. To me, it means that 13 billion years ago, this galaxy was where we see it now. Isn't that what 13b LY away means? If so, wouldn't that mean that the universe has to be at least 26 billion years old? I mean, the whole universe started from one singular point; how could this galaxy be where it was 13 billion years ago unless it had at least 13 billion years to get there? (Ignoring the inflationary phase for the moment...) I have heard people explain that the space…

is there anybody to explain me why am i wrong,if i argue that gravitational lensing is not caused by gravity,but because of the change in medium(from vaccum to the atmosphere and back to vaccum).?

What would happen if you did go across a black hole, assuming you: -Did not experience spaghettification -Did not hit the singularity -Did not get yourself fried by the enormous amounts of electromagnetic radiation being emitted -Or just otherwise lived to tell the tale. There are various theories stating that you could end up in another universe or in another place in the universe. But I'm wondering what your thoughts on it are and what it looks like going through a black hole.