Years Definition and 619 Threads

in terms of continants, life, etc thanks in advance

much difference?

We continue reaching further and further back in time by observing galaxies that were born during the early part of the universe's existence. Some of the furthest galaxies we can see are 10 billion light years away, that is, their light has taken that long to reach us. In light of the Big...

Hi, Does anyone know of any recently published books that might bring the discussions in "300 Years of Gravitation" up to date? Thanks Lou

Homework Statement A super nova releases 1.9E45 J of energy over a 10 day period. It is 1560 ly from earth. A detector, facing the star, is a disk of radius 7cm. How much energy reaches the detector? (The detector is in orbit, so it can face the star for the entire 10-day period) Homework...

Hi, I want to resume my study of mathematics after a period of 9 years. SO i need your help and guidance. I have done a bachelors with specialization in Mathematics and later on I went to study Masters in Computers. So I am quite a out of touch with maths. So can u please anyone suggest from...

How do I calculate the strength of gravity between two objects say that 2 years ago were 2 light years apart, during which they became 0.5 light years closer, if during those two light years, the stars lost 50% mass due to fusion and light, based on their mass "now", or based on how much...

Homework Statement You wish to travel to the Pleiades (at a distance of 130 pc) in 10 years, according to the clock that you carry. How fast do you have to travel to accomplish this (express the velocity as a fraction of speed of light, v/c)? Homework Equations \Delta T...

Why do we take the "no. of years to compound the interest" as power? Suppose interest is given at 12% annually, compounded once a year. At the end of the year we will have (A = starting amount): A( 1 + 0.12 ) But if it is compounded twice a year, then at the end of the year we will have...

Ok, someone was kind enough to point out to me recently the obvious fact that the universe must be much larger than what we can see. Suddenly I feel like I'm literally trying to fit all of it into my head! I've always had this nagging feeling about inflation, but it's never come up to the...

So I have been out of physics for a while now and need to find a refresher to "remind" myself of what I have forgotten. I have not been in a formal class for over 4 years, and am trying to complete my degree, but between moving and money issues it has been tough. I am resolved to finish my...

im 18 years old n both my parents died 5 years ago... i don't wna liv im 18 years old n both my parents died 5 years ago... i don't wna liv nemore. specially wen i c other families it hurts coz I am jus a 1 person on my own. n i dnt hav frends who r worth callin frends. i dnt c the point 2...

The ancient remains of a 10 year old human child reveal that even our earliest ancestors looked after the handicapped and mentally impaired in difficult times. http://www.pnas.org/content/106/16/6429.full

I asked this question of a friend. We read certain reports that astronomers have “seen” “light” from 500 million years, only, from the creation of the universe. Here is my query. 1. The universe “started” as an almost infinitely dense singularity. 2. As this thing expanded, all sorts of...

If a day equals 1000 years, How much time is one hour? I need to figure the equation based on 360 days per year. no need to worry about leap years 1 day = 24 hours (1000 years)/(one 24 hour day) = 360 days (?) = 1 hour Thank you for the help.

Let's say I have a 5m3 cube of air and right next to it a 5m3 vacuum. Does the cube of air have potential energy? According to that, the potential energy would be converted into kinetic energy when the cube of air and the vacuum were joined. Would vacuum energy be the initial potential energy of...

I am going to apply for UK universities for postgraduate. Why 4 years for M.Sci Theoretical Physics in UK? 4 years full-time Hon M.Phys How many years for P.hd? After full time M.sci or M.Phill 4 years I get Hon M.Phys ?? please tell me ? Some universities offer some combined...

I've heard that the moon is very slowly moving away from Earth. Will it eventually escape Earth's orbit?

I have a question, sparked by http://http://www.cnn.com/2009/TECH/12/16/super.earth.discovery/index.html" article, so I figured this would be the best place to put this. That is said to be 40 light years away... So if we're seeing a planet 2.7 times the size of Earth with liquid water on it...

http://news.bbc.co.uk/2/hi/uk_news/england/london/8417317.stm I found it bit surprising but not much when I read about the similar incidents in the past: http://blogs.phoenixnewtimes.com/valleyfever/2009/07/kids_accused_of_sexually_assau.php There was also another story from Britain where...

Here in my country there is a 5 year licenciate after that you take 3-4 years master degree. I would like to know the type of jobs and opportunities after 9-8 years of studying. I am starting university in 1 year. Please help.

I went to Boston University. Have a BS in Economics. I don't want to go into insurance or business and want to go to physics. I took AP physics in high school and got an A LOL. Is it too late for me to get procure a solid career in physics. I want to take it all the way (grad school, Ph.D. etc)...

I haven't had a break for several years now. Due to some circumstances I take about 13 classes now. Most of them are important (QM, particles, ED, solid state, general (EM and waves), numerical methods), some of them not but still require work. And labs. I still manage to get As - somehow. But I...

Which will be the best Choice Within Ten Years?? Right now, I'm sudying in ninth grade, but I get too worried about what to study and which field I want to work in. Mabey I'm getting a bit too crazy about this, but I think it will be good to make up my mind beforehand. I've shortlisted five...

23 Years in a Vegetative State...or not? This story has my B.S.O-Meter smoking: http://www.cnn.com/2009/HEALTH/11/24/coma.man.belgium/index.html I am struck by the contradiction of him being in completely paralyzed, "locked-in" state, yet being able to hunt and peck on a keyboard (see the...

We have more, but we love the style of this one :smile: We still plan to make a large print and hang it over our bed in an oval frame :smile:

Cosmic Microwave Background radiation is coming to us from about 13.7 billion light years away... is that correct? The reason its coming from 13.7 billion ly away is because the universe is 13.7 billion years old... is that correct? so when the universe was only 12 billion years old the...

I study a lot of C.S courses. One question i have is this: How much of what i learn about data structures+ algorithm theory, and autamato theory would be the same 300 years from now. Here is what i mean. If you can look at math, and physics. calculus is the same now as if was 300 years ago(...

I was having to fight my way into the Induction center to begin my enlistment in the US Navy. 14 Oct 1969 was declared a national "Moratorium day". There were massive demonstrations at every draft center in the nation. In Portland Or, where I was, there was a huge crowd blocking the main...

http://www.post-gazette.com/pg/09232/991889-389.stm#ixzz0RVuLh2OF I liked the one comment made by a reporter on CBS: That's 77 years of second-hand smoke.

http://www.ucar.edu/news/releases/2009/arctic2k.jsp The associated albedo flip will amplify the warming.

http://arxiv.org/abs/0801.4031"

If a day equaled 1000 years. Then from that day, how many years and days would half an hour be if you counted from today to 1000 years in the future? Of course the 1000 years has leap years, so those would have to be calculated as well. Me and some friends are curious to know the answer. It's...

Chomsky says in this video that "Real wages have either stagnated or declined for about 30 years." A commenter says: "Real wages for working people stagnated in the late 70's, started a steady decline around 1980, and they continued to decline right through the "so-called Clinton Recovery...

Hello I am new to the field. Can someon answere, i cannot find the answere in books. if life 3.8 billion years ago could form in very harsh conditions. then whay cannot it happen again today. whay cannot it have been happening all the time for almost 4 billion years. i have read that all...

...almost to the minute. The precise moment is about six minutes away. I can still remember that day as if it were yesterday. Forty years ago, the world was holding its breath.

Hi PFers! I'm physics major in a big state school and I plan to go to graduate school. Due to some financial difficulties, I'm seriously considering graduating in three years. I can finish the classes required in three years pretty easily, but I won't have chance to take some more...

I am trying to wrap my head around the Cosmic Microwave Background and how it is that the low frequency ancient photons we observe could be only 'passing' us in space now. If we think of a photon as an entity that is traveling away from the origin of the Big Bang at 300,000km/s, why would these...

Hey Y'all: Been lurking many months now... I have really been enjoying the discussion, exploration, exposition, etc on display here in PF. In any case, I saw the above headline on the Yahoo front page. Now, I understand that Yahoo headlines are not exactly a bastion of hard science...

Our universe 700 trillion light years away. Could our universe 700 trillion light years away be alien to the observable universe? Containing objects that don't exist in the observable universe for example?

How fast (close to c in mph or m/s) would I need to go to go 1000 years into the future relative to an observer on Earth? In general, is there a calculation which can tell me how fast I need to be going to go x distance in time relative to an observer on earth?

Please tell me I'm not alone on this. :frown: I went into the Air Force for one year to pay for college, took Socials for one year, I just got an AS in EET, now I want an EE. The previous three years feel like a mistake being that I know that a BSEET will be worth less than a BSEE, not to...

Hi. I'm not a student of physics, so please forgive me for my ignorance. I only have a very simple question. If the observable universe is about 93 billion light years in diameter, how could the universe have reached that size in only 13.7 billion light years? Doesn't it stand to reason...

I was wondering, if you where going at 0.16c how fast would it take you to get 4 light years?

http://www.space.com/entertainment/090515-apollo-snoopy.html 40 years! OMG! It is hard to believe that what was once the cutting edge of technology is now all but ancient history.

I decided to come back to the small town where I grew up because there is a lot of work in the gold mines. I haven't been here in almost twenty years, but I've got several people who have offered me a place to stay while I'm here. I've also been offered trucks to drive even though I have a...

Ok, here's my problem... In the EPR experiment it is described that if entangled particles are required to be able to cancel each others spin's then no mater how far apart these particles are, if one is measured you can instantly infer the state of the other particle. Why would the other...

By and large, it has been retreating glaciers, ice shelves and a general reduction in the thickness of ice masses over the last century, and more particularly, the last 25 years, that has alerted the world to the global warming. Is it known by how much, approximately, the worlds store of ice...

We current abbreviate this year as 09, however abbreviating 2010 as "10" just doesn't sound right. Does "010" work?

I can't believe that she was only sentenced to 6 years, she can probably get released in 2 with good behaviour. Just incredible that people can be this stupid. Paying bills while driving? http://news.yahoo.com/s/ap/20090404/ap_on_re_us/text_crash