Questions related to Galaxy Evolution
Need weight of each component and their dimensions, also mass and velocity data of any of ion bombardment thrusters ( otherwise any other thruster data too is welcome )?
The greenhouse effect is gradually progressing on Earth. Consequently, the risk of new climate disasters increases every year.
Currently, technologies are being developed with the help of which space ships will be built to enable a manned space mission to Mars.
In the 21st century, will man be able to overcome greater distances and get to know some other planets of our solar system?
Is it possible to develop on Earth a technology that a man can leave the solar system and, for example, one day he can reach the nearest Alpha Centauri constellation?
In connection with the above, the question arises: Will man manage to create technologies thanks to which he will leave the planet Earth, the Solar System and reach other planetary systems?
I invite you to the discussion
Thank you very much
If so, when will new telescopes be constructed, thanks to which you will be able to see what is on the planets of other planetary systems in other constellations?
Every now and then more and more perfect telescopes are being built thanks to which photographs of other constellations and other galaxies are created.
Thanks to these photographs, the cognitive abilities in the field of astronomy are increased, among others the estimated amounts of stars, planetary systems and planets in specific constellations, galaxies.
Besides, thanks to these photographs, more and more perfect maps of the blue vault, collections of galaxies and specific segments of the cosmos are created.
For example, studies conducted in recent years based on new cosmic photographs show with previously unattainable accuracy the distribution of stars in the Milky Way Galaxy, in which there is a solar system with our Earth.
In April 2018, astronomers prepared a much more accurate than the current three-dimensional map of the Milky Way Galaxy.
This was done as part of a research project with a million dollars budget. As part of this research project and thanks to the space mission launched in 2013, the Gaia probe was developed a very accurate map of the Andromeda Galaxy and a new research material was created for the purposes of research into the analysis of the past and future of our Galaxy.
The research project was implemented by the European Space Agency. Based on this research project, the latest astrometric data set containing positions and self-movements of over a billion stars was made available.
Placed on Earth's orbit, the Gaia Probe has two optical telescopes and three scientific instruments that also allow to determine the brightness, temperature and chemical composition of individual stars.
In addition, the latest data set contains star colors that provide vital information about their surface temperature and age.
The Gaia probe also provided new data in the area of 13,000. asteroids circulating within the solar system.
In view of the above, the current question is: If so, when will new telescopes be constructed, thanks to which you will be able to see what is on the planets of other planetary systems in other constellations?
Please, answer, comments. I invite you to the discussion.
There is some evidence about star formation on LMC clusters. I wonder if these clusters could change it metallicity during time.
I have observed rotation curve data of a galaxy, and I want to know what is the best and simplest mathematical model to find the galactic rotation curve and dynamical mass of such galaxy.
Your help will be appreciated
The pictures of 'I Zwicky 18' showing remarkable similarities to pictures of supernovas thousand of years after explosion. Probable happened in the centre of Zwicky a gigantic explosion. The gravitational centre disappeared almost totally. Many new stars are formed currently from matter and energy(!). The former galaxy is now in a disordered state. The widely known shape of galaxies will be rebuilt by and by.
The increasing concentration of stars respectively matter in the centres of galaxies leads at intervals of several ten million years to explosions. (See also the periodical extinctions of life on earth.) We have to assume a gigantic energetic-material cycle in universe. In case of 'Zwicky' the usual (energetical) explosion got out of control.
I wonder how the gravitational radiation at speed of light has been taken account. When clusters collide, the information for changing the curvature doesn't make the repair at once but gradually, I think.
Could the dark matter observed as gravitational lensing be due to the delay of the changes in the gravitational field? The curved field continues its moving although the center massive objects collides...
I have been reading Feynman lectures for sometime. In the volume 1 he mentioned that no model at that time could explain the formation of galaxies. Is the problem still unanswered? Please provide links or other information regarding the same topic. Thank you.
It is well-known from many galaxy surveys that the value of gas fraction (gas to stellar mass/ surface density) increases as one moves along in the Hubble's tuning fork diagram, from Sa -Scd type. So, does any paper/book talks about the typical representative values of that fraction as a function of Hubble type?
can any one tell me how to calculate the rotation curves in early -type galaxies (elliptical-lenticullar)? can I use the same equation for spiral galaxies?
The Javalambre-PAU Astrophysical Survey has just published is red book providing all the technical and scientific details about it. The main characteristic of the J-PAS project is its used of a particular set of narrow band optical filters (54) to compute photometric redshifts for millions of galaxies spread along more than 8500deg².
As a J-PAS member, I'd like to know your opinions about this technique and about the J-PAS survey in general.
I am interested in finding closure relations for the BBGKY-equations and came across an old article ``On the integration of the BBGKY equations for the development of strongly nonlinear clustering in an expanding universe'' by M DAVIS, PJE PEEBLES, Astrophysical Journal Supplement Series, 1977. I am used to closures where the three-particle correlations are either neglected or are approximated by Kirkwood's superposition principle, which appears ad hoc to me and is inaccurate for certain applications.
In the article by Davis and Peebles, something I haven't seen before was used, a scaling solution where n-particle correlation functions are approximated by a simple power law. It looks like this only works if the particles are far apart from each other and if there is no characteristic length scale in the particle interactions, which is the case for gravity. This made me curious: How useful did this approach become in Astrophysics simulations, is it still used or was this a dead end? If not, has there been any recent improvements on this approach?
Has such a scaling approach to the BBGKY-hierarchy been used in other areas of physics, like plasma physics where there is also a power law (Coulomb) interaction?
I just was wondering how much the quantity of stellar mass (still burning hydrogen) has changed since its formation, from the different parts of our galaxy: disk, halo, bulge, solar neighborhood.
Some stars explode but they are the fewest, some others interact but they are the fewest - is this correct?
Of the 72 central supermassive black holes on the McConnell and Ma table in their paper “Revisiting the Scaling Relations of Black Hole Masses and Host Galaxy Properties”, I have only found six galaxies in which the baryonic mass has been estimated for the entire galaxy. McConnell and Ma have listed the mass of 41 central bulges of these galaxies; however, in this project the central bulge is not a good proxy for total mass. In addition to publications, any leads to people who or institutions that may have done these calculations would be helpful.
In particular, the Jackpot (SDSS J0946+1006, Gavazzi et al 2006, Sonnenfeld et al 2012) seems to contain a significant quantity of dark matter, even in the central regions that are being probed by strong lensing.
I just was wondering how many stars were born in the inception of the Milky Way embedded in a multiple system, and the single stars we see nowadays had as origin a multiple system?
In which way could we get this kind of information? how do we set the initial conditions of our Galaxy?
As per Hubbles law, recession velocity of galaxies is given by v = cz, where c is velocity of light and z is gravitaional red shift. In case of QUASARs generally z >1 and even in some cases it is Z>5. If it is so, v become more than velocity of light. How to explain it? Is it not violate theory of relativity?