Astrophysics Definition and 876 Threads

Where can I download free online books on Astrophysics? Thanks.

Homework Statement 1) Calculate approx. how many Cosmic Microwave Background-photons that you would absorb per second if you were in space. The Attempt at a Solution Ok, I know that the CMB-photons fit with a blackbody spectrum with T = 2.725 K. So the total amount of photons I find by using...

hi, I am having trouble deriving an expression for converting between monochromatic flux expressed in wavelength and in frequency units. i think that the monochromatic flux of a star is found by F(Δf) = ΔE / ΔtΔfΔA F(Δλ) = ΔE / ΔtΔλΔA where E = energy, t = time, Δf = frequency bandwidth, A =...

hi. this is probably in the wrong place, but what is the difference between cosmology and astrophysics... i only ask because i wanted to be an astrophysisist, but before i make up my mind for sure i just want to know what cosmology is... thankyou dan

Hi I am new to the forums and I am currently a 1st year student, and I am planning on majoring in astrophysics. I wasn't sure whether to put this here, or in career guidance, but anyway. I was just wondering what kind jobs are available for a major in astrophysics and if it is is almost...

I have had a love for astronomy when I was a child. Today, I am well on my way toward becoming an engineer (Mech). I would like to find out how much of a common thing is it for engineers to go work for astronomical societies/research institutes/ observatories doing any kind of engineering...

Anyone studying either physics or Astrophysics next year at Edinburgh university?

hi! i'm a 2nd yr civil engineering student. after completing my b.tech in this field is there any scope for me to make my career in space_technology or to study in astrophysics? is there any entrance exam? please... inform me.

Our college has just established a new department: laboratory of high energy physics and cosmology. And it is the first in our country. We are first students,too. Can you help me have a general view on cosmology and astrophysics? We only know little about some constellations and solar...

Several friends and I have a great yet unexplored interest in Astrophysics, and interesting Math not taught in the typical high school course. We have decided on forming a discussion based "club" (we will read/do research in between discussions) to help us learn more deeply and efficiently. I am...

Hi, uhh, well I don't exactly know how to start here. I am a sophomore in high school and I am really interested in astronomy and physics, so obviously this was the first place for me to look. The thing is though, I don't know that much about neither astronomy or physics (due to my counselor not...

Hi Everyone. I thought I'd pose this question here since I've gotten much conflicting advice about this from pretty much everywhere. My goal is to get a PhD in astrophysics. I am interested in both theoretical and observational cosmology. My undergrad degree is in physics. The reason why I...

Can you tell me How Much is the difference between theoritical and experimental astrophysics?

I deadly like to read and think the topics of astrophysics.I am an undgrad student of physics major. Is it really hard to make good career in astrophysics? are not jobs too much available ?

I'm sorry if I'm posting this in the wrong section, I'm new here, I'm Aimee and I'm 16...Well, geez...:redface: I feel so...young and uninformed. lol I'm just in High School and I am in an Astrophysics class and I'm going to take Physics next year and study Astronomy and Physics in College, but...

hie all, i'm a student and I'm working on a software using FITS file. I need coordinates of galaxies which are stocked in those FITS file. For that i have to use a c++ library then i'll b e able to extract them. i would like to know if somebody has ever code a c++ program using a FITS...

Hi all. This is going to sound a bit odd, but I'm actually coming over from a piano forum of all places XP Me and a couple of friends are trying to solve some analogies off a very high-ceiling IQ test (the Titan Test) for fun and a question has arisen that none of us will ever be able to...

Hi, i'm searching for a big database where i can find informations about astrophysics objects (stars, galaxies, etc.); the informations i need are mass, position, etc. (and if i can, references to the papers on that object). Does a so big database exist? Thanks

Hello there, I was searching the net to find some empirical formulas on how to estimate the loss in temperature (and increase in luminosity of a star as it ends the main sequence. I've found that some of these formulas could be located in a book called "Astronomy & Astrophysics 210" by Maeder...

Hi there, I am currentley in grade 10 and am having trouble getting into the highest maths which is geometry and trigonometry which in partnership with introductory calculus goes into Calculus in year 12. I have gotten into introductory calculus but I am quite positive that ill need calculus...

Hi, I've just graduated from school and getting ready for university. I really love computers and astronomy-astrophysics. I've decided to follow a career as an a electrical and computer engineer and not physics. I've chose this mainly because I will find a job easier than going to physics (at...

hi friends can you help me in collecting systematically some important phenomenon or 'effects' in astronomy and astrophysics like rossiter effect, yarkovsky effect.:cool: even recently discovered phenomenon and related explanations are welcome.:approve:

I have no clue if this has been done before, even though I Searched... But I'm 17 and want to learn about Astrophysics, it is one of the things that really appeals to me. I tried to take Physics in school but my teacher was terrible and wouldn't even answer my questions. Do any of you...

i have 2 questions: 1. what is the difference between astronomy, astrophysics and cosmology? 2. what did Alan Guth mean when he said, "The universe is the ultimate free lunch"?

1) From the ground of the Earth, atmospheric turbulence limits the typical best image to a full-wide-at-half-maximum (FWHM) of ~0.5 arcsceond (this is an angle). Suppose we can determine positional accuracy of stars to ~1/10 of the FWHM, to how far in light years can we use the parallax method...

Ok, so I need a topic to present. I am taking Quantum mechanics, introduction to astrophysics, and a seminar class... I need a topic for a 30-40 minute presentation for each class, and was wondering if there are any interesting topics that tie QM and astro together... thus, one presentation...

Ok, so I need a topic to present. I am taking Quantum mechanics, introduction to astrophysics, and a seminar class... I need a topic for a 30-40 minute presentation for each class, and was wondering if there are any interesting topics that tie QM and astro together... thus, one presentation...

hey all, Has anyone got any suggestions for a good astrophysics starter text. Not to keen for a pop science book, more of a qualitative book. Regards

What kind of unsolved problems are there in astrophysics right now?

Hello, I need an astrophysics simulator. I've googled and yahooed but couldn't find any. If you kno where I could download one please let me know. Thanks for your time.

Which are some of the most nascent and/or least researched subjetcs in observational astrophysics?? how about Quasars and Pulsars?? So far i know it needs top quality instrumentation to get info about them...can anyone tell me about the "hot topics" in astrophysics in the near future. Dark...

On my apps I've been concentrating mostly on condensed matter or high energy physics, but I also love astrophysics and want to apply to one school to have the option open. However, I've heard that it's easier to get in (as in, scores are often lower for applicants). Is this true or not? I want...

Hello, I've taken a look around these forums, but I haven't seen such questions. I'm interested in Astrophysics (I'm even applying to University of Cambridge for this course), but I'm a very beginner in it. The question is: what should I start with? Yes, of course maths - that's not a...

I'm familiar with the NSF fellowship, but I was wondering if there are any others I should be looking into to support a PhD in Astrophysics. Any suggestions?

I plan on a double major in physics and astrophysics, possible a math minor mor major too. I have looked at school websites for the books they use and have had no luck. Is thre anywhere online i can find what books a school uses for what class? If not what are some good astrophysics books that i...

I was wondering if someone could give me a top ten of astrophysics programs (or less, if you are not familiar with 10). Here's my current list, in no particular order, based on my limited research: 1. UCB 2. UCSB 3. Cal Tech 4. University of Chicago 5. University of Arizona 6. UCSC 7...

Firstly, what is astrophysics exactly? Is it the same as astronomy? Also, can I study astrophysics after studying aerospace engineering? If so, is it worthwhile? or I just get simply two kinds of degrees?

In no more than half a page for each process, summarise the physical nature of each known nucleosythetic process and the environment in which each process takes place. (s, r and p processes) I was just wondering what would you say is meant by the "physical nature"?? I've explained the...

http://ascl.net/

"A star, with mass 5.40*10^30 kg, revolves about the center of the Milky Way galaxy, which is 3.93*10^20 m away, once every 3.41*10^8 years. Assuming that each of the stars in the galaxy has a mass equal to that of our star, that the stars are distributed uniformly in a sphere about the galactic...

OK PhD's, check this out! http://universe.gsfc.nasa.gov/ - Exploration of the Universe Division :-p http://universe.gsfc.nasa.gov/jobs/ - :-p Go for it! This probably belongs under Academic and Career Guidance, but it seems more appropriate here.

Hi all, I just found out that the college I will be attending this Fall is no longer offering the program that I wanted to do (Computer Information Systems) as undergrad. It got me thinking about what I really want to do. So I moved to America from the UK almost a year ago. Instead of...

math is must commonly used in astrophysics and quantum physics? This might be a stupid question. Not sure

guys please help me with these questions, we had to do the astrophysics course over the holidays by ourselves and I haven't quite understood these sections 1. How far from the Earth is 61 Cygnus (a) in parsecs (b) in light years if it’s annual parallax is 0.29 arc seconds. 2...

The energy generation rate for p-p fusion has an approximate dependence on density and temperature given by: E= e (p/pc)(T/Tc)^4 i don't know how to write all the symbols so in the above: E is epsilon, e is epsilon at the centre of the star, p is the density, pc is density at the centre...

Introductory Astronomy & Astrophysics by Zeilkik and Gregory 4th edition. What are your opinions on this book? As far as I know the field has changed dramatically over the years and I was wondering if I should get a better or newer book since it was published in 98. I also heard it had a...

So, I'm a US student. I'm in my second year at uni. I was thinking about transfering maybe to a school in europe. Here in the US we have sites like collegboard.com or princetonreview.com where you can search criteria and it'll show you all the schools that match your preferences. is there...

I just want to know if anyone has any good web sites on astrophysics. I am a beginner and I do not know where to start. Thank you very much.

Question: A typical white dwarf has a mass of 1 solar mass and a radius of 10 thousand km. A typical neutron star has a mass of 1.5 solar masses and a radius of 30km. Given that there's a natural speed limit in Nature, namely the speed of light, is it possible to have a contact binary...

hi, I have some money which I have to spend on physics & astrophysics books. I want your openion on this matter. I am looking for books which are not too specific. For example I like A&A library of Springer but I do not want to buy books like "Supernovae" or "Gravitational lensing". From...