Years Definition and 619 Threads

ZapperZ submitted a new PF Insights post First years of Graduate School from Being a TA to the Graduate Exams Continue reading the Original PF Insights Post.

Lets suppose I had a very powerful telescope and I could see 10 light years away. Would I see cars and people on that planet as they were 10 years ago? Would I actually see the people moving and the cars moving on the ground?

Hi! I'm an Indian student from the CBSE curriculum in 10th standad (started a month ago). I want to do under-graduation in Astronomy / Computer Sciences / Robotics / Mechanical Engineering (still not decided yet. But it'd be much better if I can able to study all of them together :p) in any of...

I'm curious as to whether completing one's undergraduate studies faster is a disadvantage for applying to graduate school. While there are many reasons to stay the full four years, many also have real reasons to finish earlier (financial concerns being a main one). I'm going to assume that all...

While browsing the homework questions section I find myself unable to answer - for example - some of the 1st/2nd year physics questions and I'm currently in my 3rd year. I could have answered them at the time of studying but now it seems I can only remember the things I'm currently studying. Is...

This is the latest update from the USGS and affiliated institutions for California, USA, for the next 30 years.. see more at ... http://www.usgs.gov/newsroom/article.asp?ID=4146&from=rss&utm_source=dlvr.it&utm_medium=facebook#.VRUfzU3EDxH cheers Dave

I was reading up on the Andromeda Galaxy and it was saying that it was 2.2 to 3 million light years away from earth. So my question is how do we measure how far it is in light years?

Hello, Always looking for answers to my questions, I had some answers like what micro black holes possibly created at the LHC (if it does not evaporate) would put millions or billions of years to be dangerous? I would like to know why Sorry if I come to you Ps : sorry for the way I did not...

On the other hand, what if we only have two atoms of an element with a half life of ten years. Then after then years, only one atom of that original element remains. What happens next? Is the lone surviving atom immutable?

I thought that this might be a concern for the standard Cosmological model? An extremely large Black Hole discovered to have existed just 900M years after the Big Bang...

Scuba Divers Discover (by Chance) 'Priceless' Gold Coins in Israel https://gma.yahoo.com/scuba-divers-discover-priceless-gold-coins-israel-173801909--abc-news-topstories.html

Hi, my name is Matt, I'm 16 years old and an aspiring physicist. I've recently found myself in a position of great uncertainty. I'll provide some background. I was a reasonably successful High School student although academics were secondary to leisure in my life. At the beginning of my junior...

I'm studying at a trade school right now, to pursue a career not in the sciences. I'm also considering pursuing a degree(s) in a field of science later on, not just because of the additional job market, or the additional skills, but also because of a love and respect for the subjects, and a...

How much temperature is needed to melt ice -30C that covers an area of 34 million km2 and has the height of 11.4 km in 400 years? For example, X number of celsius degrees are applied non-stop for 400 years in order to melt this ice entirely from the surface (turn to water)

Where has my thinking gone wrong in the following? A man begins traveling to a destination several thousand light years away, accelerating to a velocity of near-light speed. Time dilations and space contractions would result in the trip lasting only a few years from his perspective. From the...

Hi I'm feeling very pathetic at the moment...! Can anyone tell me how to work out the following equation on a calculator? Thanks! PLEASE NOTE THE "6" is the power of 6 :-) So, here's the equation... X = 5220 (1.05) 6

how can i find data for Earth magnetism for the period 30,000 years to today, is it possible to control magnetism forces thanks

We can see galaxies/planets light years away determine their composition such such as if they have water et cetera. My question is if light takes billions of years to reach us from there how is that we can determine such things? Is the speed at which a telescope can zoom faster than the speed at...

http://www.bbc.com/news/magazine-30641742 Magna Carta outlined basic rights with the principle that no-one was above the law, including the king It charted the right to a fair trial, and limits on taxation without representation Only three clauses are still valid - the one guaranteeing the...

Does anyone actually believe this statement? I had a few well meaning, though severely misguided, people try to tell me this back when I was in high school. How can it be better? No bills? So what? Do people just forget what it was like to actually be in high school (or worse, did they peak in...

In the past it appeared that in some institutions, the very fact that a postdoc could get research funding on his/her own might have been the impetus for them to continue to hire his/her as a staff member. As much is stated in the PhysicsForums guide...

I am curious to hear your stories / opinions on what do physicists do after many post-PhD years in academia? A small fraction may get more-or-less ongoing research and/or teaching academic positions, but what about the majority of physicists? It appears that if a physicist tries to pursue a...

And it seems like it's so straightforward for everyone else, which is incredibly frustrating. It's about the relationship between pressure and flow rate of a fluid moving in a pipe or closed system. Often what I've heard is, they have an inverse relationship...but then there are cases where...

I graduated with my BS in physics/astronomy in 2010, and at that point I was super burnt out on school, and knew that I would not be able to handle grad school, and had no interest at all in doing research. Since then, I have been working in informal science education (including a one year grad...

UNC report finds 18 years of academic fraud to keep athletes playing http://www.cnn.com/2014/10/22/us/unc-report-academic-fraud/index.html?hpt=hp_t1 Pardon my phrase, but heads need to roll on this. The sad thing is that this is likely a common story in many big sport universities. A total sham.

I am trying to understand the concept that the universe is infinite at that nothing holds the universe in. I have been thinking hard on this and was wondering if someone could help me or am i I just to young to understand? I need help my brain hurts! (idk if this is quantam physics or not)

I have a unbalanced body and have done for 10 plus years maybe longer. i think a combination of things has done it one i am from young age racket sports mad tennis and squash etc so my right hand side has always been stronger than my left. Also years ago when gym equipment when it was not...

Modify the program to print the U.S. presidential election years since 1792 to present day, knowing such elections occur every 4 years. Don't forget to use <= rather than == to help avoid an infinite loop. #include <iostream> using namespace std; int main() { int electYear = 0...

- This may be a stupid question as I am totally new to the concept of interest. I don't even know if my question is valid. - Figure is given below for referenceSuppose I deposit some money in a bank that pays compound interest on yearly basis. If I decide to withdraw my amount at the end of 3.5...

As the title says. I found some contradictory articles about us (not) having the same dna as prehistoric men 50.000 years ago. So how did our dna evolve in the last tens of thousands of years especially human dna of today compared to human dna at the end of pleistocene and can i find some...

hii everyone...i will be 22 this november due to some personal reasons i was not able to continue my studies for past 3 years now i am considering starting bachelor in electrical engineering it is a 4 years program...so till completion my age will be 26 so it is worth it?? will there be...

I’m graduating with a Physics degree next year but for various reasons I cannot go straight to grad school and get a PhD. I probably won’t be back to school for some time (I’m projecting 10-15 years). Will it be hard to start a Physics PhD after so long? Is there ageism in academia? Thanks

http://www.c-span.org/video/?8671-1/president-nixons-departure-white-house I was at home that summer, between my junior and senior years in college. My parents and I watched Nixon's departure on live TV that morning, followed by Gerald Ford's taking the oath of office as his successor.

Hello This is question is bugging me for years. Why is division by 0 undefined and not multiplication by 0 undefined? If any number multiplied by 0 is 0 then the logical answer for any number divided by 0 would be ∞ (for me at least). If you "define" N/0=∞ and N*0=undefined then there are...

By the time I apply for PhD's, it will have been 2 years since I did my REU over the summer in a plasma physics lab. Do you think the Prof will still remember me at all and/or be able to write a letter for me? He has already written me letters for other stuff so I know he'd probably be willing...

Somehow I managed to miss an anniversary from my childhood: It was 45 years ago last Sunday that the Cuyahoga River caught fire in Cleveland, Ohio: I was in high school at the time. My family didn’t live in the Cleveland metro area, but close enough that we mostly watched Cleveland TV...

http://svs.gsfc.nasa.gov/vis/a010000/a011500/a011537/ This is so confusing. If light travels at the speed of light, c, then how can it take 40,000 year to get out from the sun? Photons undergo fusion? hahaha. I never knew that

In general, would I expect to be able to complete a double major in physics and computer science in 4 years?

For many years, biological scientists have sought to decipher cellular function by quantifying the degrees of protein and mRNA expression within populations of their cells of interest. Classically, these measurements required combining many cells into a single sample and rupturing their...

First of all, thank you all for taking the time to read this. and yes I am assuming that most people do finish their engineering degrees in four years! So I am near finishing my pre reqs. All the maths an and the sciences. I think I have got two math classes and and a physics course left...

A cryopreservation of moss. http://www.livescience.com/44134-old-frozen-antarctic-moss-regrows.html That would be a record in preservation! Anyone know the next best, probably quite a few years less than 1500.

Hello everyone, I have come to you for advice in regards to my education and transfer for my major. I have been at community college now and completed one semester with a second semester in progress. I have almost completely decided I would like to major in Mathematics with a minor in...

Hi, I'm currently a junior majoring in physics/math, and I'm on an accelerated masters track so I can get my masters in physics after 4 years plus a summer or extra semester. My plan after graduating is to go travel around for a few years (possibly between 2-3), and then return to finish my PhD...

Hi guys, I have a question that I need some help with. I'm not a biologist nor do I have any educational background in biology so please excuse any ignorance that I may show. I am writing a presentation which is called "Addictions that will be common in 10 years from now" It looks into...

Hello, everybody. :smile: I am a high-school student about to finish school (in fact, I only have to pass examinations now). I am 17 years old. I have not been able to really grasp all concepts and have a good grip on Physics, Mathematics and Chemistry and have thus planned to take one...

Assuming the person is of capable intelligence, what research prospects are there for someone who obtained their PhD at 40 years old? I'd specifically like to hear opinions about PhDs of theoretical physics, experimental physics, pure mathematics, and theoretical computer science.

Apple's "1984" TV commercial: 30 years ago today It was broadcast twice: once during the 1984 Super Bowl, and once before that on a local TV station in Twin Falls, Idaho, in the middle of the night. The earlier broadcast was so it would be eligible for 1983 creative awards, without making any...

A Star at the Edge of Eternity by Dr. Ken Croswell Every star that now shines will one day die, but some stars live far longer than others. Our 4.6-billion-year-old Sun will shrivel into a white dwarf in 7.8 billion years. Now astronomers say a dim red star south of the constellation Orion...

"So what exactly has changed in physics in the last 20 years?" So I was at a Christmas party joking around with one of my friends who is in electrical engineering and he said something basically to the effect of "Well physics hasn't changed in like 50 years" Which is actually not a bad...

I'm a biochemistry major (chemistry focused, not biology focused program) and I have just completed the fall semester of my junior year. I completed my first semester of physical chemistry (chemical thermodynamics) and I really enjoyed the mathematics. My major only requires calculus 1 and 2...