Astronomy and Cosmology

hi, I read that there's evidences indicating that black hole could host universes. I have some idea about how it could be, inspired by bending of space-time - the radial dimension from our point of view would become the time line of the inner univers - the surface dimension would be the holographic (see the holographic theory) version of the content of the inner univers. My idea is that since relativity tells us that something going at the speed of light should apear to us frozen in time, and since the general relativity tells that what is inside the black hole horizon seems to us going at that speed, the inner univers should be frozen in time. So the space-time c…

Why Pluto is a dwarf planet? It was being demoted to dwarf planet status during the IAU conference. First, what is planet? A planet must fulfill these characteristics: 1. It has enough mass to form itself into a spherical shape. 2. It is a celestial body that orbits around a sun. 3. It clears away all smaller objects in its immediate neighbourhood. Pluto fulfills the first 2 but not the last requirement, thus it is a dwarf planet. My question is why they are still objection towards this decision? Are they any reasons that can be proved to show that this decision is wrong?

What accounts for the gravitational effect of a galaxy in space......... 1. The outermost stars or 2. All the stars (matter, black hole etc.) that are present in it taken together If the answer is all the stars, how does the gravity of all the stars (entities) accumulate, when there are huge distances among them? An example, A space probe that has to escape our solar system is concerned with the gravity of the last planet (Neptune or may be Pluto or Sun) rather than the gravity of Earth, Mercury or Venus. When the effect of these 3 planets has a negligible effect on the far away probe, how can stars in the interior of …

Why Stephen Hawking said there are no black holes? If so, do you think grey hole do exist. How and why?

Hello, I hope I am at the correct thread for this. If not, any help/re-direction would be a great help! I thought I'd share a radio drama I've been making on here. It's called Transmissions From Colony One, and it is a science-fiction story based in realism. Though it is indeed all audio, it is a "found footage" format, telling the story of the first manned mission to Mars, the astronauts involved being sent on a one-way trip to start colonizing and terraforming the planet for human settlement. The first season aired last summer, and played in nearly 70 countries worldwide. It's also garnered attention and recognition from people at NASA, SpaceX, ESA, JAXA, MarsOn…

In the experiment LIGO not detectable gravitational waves,despite its high sensitivity is due to the fact that sources of gravitational waves are located at large distances from the Earth.The waves may change not only the sizes of pipes,but also synchronous resizes the surrounding space,therefore there are no changes in the interferometer.

The 1% Concordance Hubble Constant http://arxiv.org/pdf/1406.1718v1.pdf new value from collective data, best-fit Hubble constant of 69.6+/-0.7 km/s/Mpc. the tighter constraints are in excellent agreement with LCDM concordance model.

I'm looking for other articles, both countering and supporting the metastable Higg's as a possible inflation influence. Some like these tend to add further speculations but that's OK as I'm more interested in the above. I'll filter through the articles as they are recommended. Just doing this for self research, the Higg's field is an area I'm currently studying in particular the seesaw 1 and seesaw 2 models of SO(10). If anyone happens to know a good article covering non SuSy SO(10) I wold also be interested. I have found tons of the SuSy forms but haven't been able to locate the non Susy. Even though numerous of my articles state there is a non SuSy varient. Met…

Was there light at the very instant of Big Bang?

Hi guys I am looking for a dataset to use in my thesis. I am working on UNION 2.1 sample of supernovea Ia data. That dataset consist of redshift and distance modulus with uncertainty (sigma) for 590 supernovea. Do you guys know where can i find similiar dataset for GRBs?

I am not a physics major, just interested in the discussions about cosmology. But many times get lost in the discussions. Many people show the beautiful fit of the model and the observed CMB power spectrum (~ like the one below copied from Wikipedia). But I can not find the mathematical equation(s) of this best-fit lambda CDM model... Could anyone help??? Thanks a lot!

I am a student and we are working on a satellite project. I need help regarding the payload transmitter portion of satellite of frequency 433.9MHz and data rate 256kbps using BPSK modulation technique. If any relevant link .. kindly inform

I spent some time over a month ago seeing what model for the big bang exists. As far as I was able to get, the argument was that a quantum fluctuation generated the universe. Is that quantum fluctuation argument the current view on how the universe was generated?

With all the handwringing concerning what we should do if a large asteroid threatens Earth, I have a pretty simple idea. Embarrassingly simple. The Japanese have already demonstrated we have the technology to land a spacecraft on an asteroid, so, we land one or more relatively small spacecraft on the asteroid, rotate the landing engines 180 degrees, fire them up, and literally push the asteroid into another trajectory. Please spell my name correctly on the check, Mankind.

Dear All, As I have mentioned on another post on a different forum, I am doing some research for a science-fiction book as part of the story, and I was wondering about some details of the moon Titan. One chapter describes the crew landing on Titan and disembarking from a spacecraft onto the surface. My question is this: What would they see across the surface? I read somewhere that Titan has a denser atmosphere that Earth, and there is a layer of haze at some point. However, would this haze be seen as a sort of fog across the rock? Or would the low-level air be clear enough to see for a long distance? Please provide any explanations you can; it would be…

Hello, members of the Science Forum community. I am a 15 year old with a huge interest in Astrophysics and Astronomy as a whole. But it has been very inaccessible for me, for learning Astrophysics is no piece of cake. I'm merely another product of a typical educational system with a laughably limited amount of knowledge regarding Physics and/or Astronomy. So basically, i just want to know that before I get into reading higher level books or scouring the internet for information, what are the basics I require and the foundations I need to comprehend an average (higher level) article regarding the fields? I realize my question is rather vague, but I hope I got my point ac…

1. What would happen if the earth were to stop rotating? 2. What happens in a black hole? My theory is that nothing actually disappears but rather breaks up into millions of pieces and therefore seems like something has disappeared 3. Will it ever be possible to cut through the centre of the earth? E.g. from australia to japan

Based on the big bang theory, stellar and planetary development requires gravity to accumulate cosmic gas, but particles move too fast to coalesce. At -272.15°C, hydrogen atoms move at 158 meters/second while helium atoms move at 79 meters/second. All you need is a velocity of 4.31498e-14 meters/second to escape the gravitational pull of an H2 molecule. There’s no doubt that cosmic clouds possess a lot of gravity, but the gravity is divided by the gas particles that make up the cloud (mass = gravity). Hence, the gravitational sum doesn’t coalesce anything because it can’t get the first two gas particles to cohere. It can only move the matter to a particular direction to…

Rather than sidetrack my other post I will ask the question here. I have been unable to find any useful description of the word photon other than discrete bundle or wave-packet neither of which are very helpful. The descriptions available seem to describe a particle like structure rather than a wave like structure. So how are photons and waves connected, what relationship does the energy of a photon have with wavelength. If light travels as photons why bother to describe it moving as Electro-magnetic waves.

A few days ago I read about this globular cluster of stars coming at us 'like a cannon ball'! (reporters crack me up!) According to the article, there is a cluster of 100,000 stars heading this way from 53 million light years away. They are figuring it will be here in about 17-18 million years. Now please bare with me, I might start talking out of my butt here... but if the cannon ball is traveling at 2 million MPH(according to the article), which is 894 Km/sec, isn't space expanding faster than that with these kind of distances? Expansion increase the further apart items are, right? I get the fact Andromeda Galaxy will reach us, it is only 2.5 ly away. W…

http://www.cfa.harvard.edu/news/2014-10 http://www.illustris-project.org/ awesome development, can't wait to see the published papers and B-body codes. Looks cool on the vid

Tell me science, whats past it?

Just need to test a light cone calculator for display compatibility on this forum. the light cone calc can be found on my signature thanks for the patience the calc is not compatible, it is on some forums but not this one http://www.einsteins.../LightCone.html http://cosmocalc.wikidot.com/start

Recently while posting a theory about how the universe works on another site, I came across a problem when dealing with waves and gravity. The basis of the problem goes back to one of the ancient greeks and his thoughts on infinity. If you take a curved surface, in this case a star, and draw as many straight lines as possible radiating out from its surface then no matter how many lines you draw if you draw a larger circle around the original there will be gaps between the lines, the greater the radius of the second circle the bigger the gaps. Light travels, basically, in straight lines. EM waves oscillate, 2 waves at right angles, simulations are easy to find on the in…

Two questions here. The first is about the red shift of light and it came about in another thread called galaxy rotation curve. The answer I understood was, we can determine the rotational speed of galaxies by the red shift of their light. So I went to Google and stated to research red-shift which led me to my question: How do we know that light is red shifted because the light source is moving away from us and not from something else? ie: Gravity has been proven to affect light, couldn't the source be closer and simply shifted red? (Black holes, dark matter...etc) Second question, in researching red shift I came across many weird sites that claim they…