Age Definition and 590 Threads

The problem statement The ratio between stable Argon atoms(##^{40}Ar##) and radioactive Potassium atoms(## ^{40}K##)in a meteorite is 10.3. Assume that these Ar atoms are produced by decay of Potassium-atoms, whose half-life is ## 1.25 \cdot 10^9 ## years. How old is the meteorite? Translated...

According to Einsteinian Relativity, is the Universe considerably younger if one was to view it from within a greater distortion of the gravitational field? Is the value we assign for flat or non-flat universal age dependant on our own point of reference for time?

My first Post :) I understand photons are are not going to age. But they still have a time in which they are created. Maybe this is known and I am just late. While learning about photons, right away I got he question if we can measure its born date.I mean everything decays right? So we should...

Hello everyone! I've been having trouble regarding the age of the universe and another small problem. This problem escalated when I first started reading Dr. Brian Greene's book "The Hidden Reality". The distinction between the two possibilities, that our universe is finite or infinite, plays...

Forgive my ignorance?.. If we can see 13.8-ish billion light years away how can the universe be the same age? Matter cannot travel at the speed of light, so how are we as far away (in light years) as the universe is old?

I am a thirteen year old passionate to learn calculus(and possibly programming) but i do not know how to start. Please help.

Hello, I`m an Indian citizen 27 of age. I was enrolled for an undergraduate course in Electrical engineering but due to the financial turmoil in my family i had to drop college and start working in a BPO industry.But something good happened while working in this industry,i got to interact with...

Hello, I think it was Kurt Gödel who asked this while taking about time. The age of the universe and its size, is whatever it is for us because we are moving at a specific speed relative to light? If that is true, then a consciousness living on a planet moving at triple the speed of Earth...

The Size and Age of Our Universe If the universe is 14 billion years old, (roughly) then we can only see out in any direction for 14 billion light years. Thus any stars beyond 14 billion light years are invisible to us because their light hasn’t had time to reach us. If we cannot find an edge...

I'm a retired geologist ... Know little about cosmology or quantum physics so will defer to others. Please excuse my rambling question. Something has always 'made me wonder' about the potential fate of the Universe. Almost all models predict either an infinite Universe or a Universe that...

A Google image search of "normal blood pressure versus age" came up with charts that I don't understand completely. Consider the following information. Also see, http://www.betterhealthfacts.com/2014/02/normal-blood-pressure-for-men.html It looks like it is normal for blood pressure to rise...

By fitting redshift distance data we can estimate the present Hubble rate H0 and the longterm limit that the Hubble rate is tending towards H∞. The Age (how long the universe has been expanding) can be calculated just from those two measurements, assuming the spatial-flat standard cosmic...

Homework Statement A 26 year-old biologist makes a trip to study alien life forms in a distant planet 10 light-years away. The round trip including a stay of 1 year in the distance planet takes 21.5 years according to the clock on earth. The biologist’s son is 3 year-old when she left. Assume...

Hello. I have been contemplating whether or not I should start pursuing a degree in CE, EE, or Comp Sci. I currently work as a wildland firefighter and am not happy with what I do. I started to learn programming about 9 months ago with various online tools such as Codecademy and taking online...

This is a follow up to another thread (https://www.physicsforums.com/threads/something-about-calculating-the-age-of-the-universe.807250/), but I post it as a separate thread since it is not clear to me (a) this is actually correct, and (b) assuming it is, whether it actually provides a...

Good day all,First of all, I want to let you guys know that I'm quite new to the subject so please bear with me in case I'm asking a very basic question here. I have a struggle with the way the Age of the Universe is calculated by using Hubble's Law: V = H x D and I hope you guys could clear...

I'm taking an introduction course for simple physics. All problems are solved with simple single variable analysis. My problem is that this is an introduction where you don't need any advanced math to solve the problems, but I can't remember how to solve the last equation. Would you mind helping...

Would you mind if I ask how old you are ? I am in my 30s, have fallen in love once when I was in my early 20s. After the breakup, I don't want to fall in love again.

From what i have read, right or wrong, there seems to be an universe (age) problem for modern cosmologists, This is the best paper i have found on the subject. http://arxiv.org/pdf/1402.6433v3.pdf Abstract Many dark energy models fail to pass the cosmic age test. In this paper, we investigate...

I understand that it's possible to calculate the age of terrestial planets through radioactive dating their soil. However, the gas planets present a different challenge since we cannot currently land on them. Any ideas on how to calculate their ages in a different manner?

If we are part of a Multiverse is it likely that every universe is the same age ?

All Hail Spock! Live long and prosper! http://www.usatoday.com/story/life/tv/2015/02/27/leonard-nimoy-obit/24120819/

Hi, Could someone enlighten me in this matter? . how the calibration of cosmic distance scale affects the determination of the age of globular star clusters? thanks a lot :)

Hi I was posting on io9 on a thread that asked "what scientific fact transformed the way you view the world?" I posted I got that from Brian Greene in The Elegant Universe. Someone responded challenging me with. I'm really having a hard time making sense of his reasoning and why gravity...

I posted on another topic of going into engineering at age 30 but I really have an interest in math and physics and I want to study physics. Not because it will have money waiting on me at the end, or for any other reason for the sheer joy of learning it and just being happy. Lately in my life...

We have had: https://www.physicsforums.com/threads/is-there-an-age-problem-in-the-mainstream-model.94479/'][/PLAIN] Is there an Age Problem in the Mainstream Model? (Oct 2005) Cosmic age problem ? (Nov 2008) Is There An Age Problem In The Early LCDM Model? (Jun 2010) Massive galaxy cluster...

Homework Statement The carbon in living matter contains fixed proportion of the radioactive isotope carbon-14. The carbon-14 in 1.00g of living matter has an activity of 0.250Bq. The half life of carbon-14 is 5730 years. (a) Calculate (i) The decay constant in s-1 (ii) the number of carbon-14...

Saudi King Abdullah has died, Prince Salman successor -AP http://news.yahoo.com/saudi-king-abdullah-died-prince-salman-successor-005248974.html http://news.yahoo.com/saudi-state-tv-reports-king-abdullah-died-90-232925751.html Saudi King Abdullah dies, new ruler is Salman - Reuters...

Homework Statement The isostopc abundances of a sample is U-235 and U-238 are 0.72 and 99.27 respectively; what is the age of the sample? (assume isotope abundance was equal when sample was formed) Homework Equations \lambda=\frac{ln2}{ t_{\frac{1}{2}}} The Attempt at a Solution for U-238...

I currently work in the pharmaceutical industry and I work in a lab testing purity of controlled substances. I have wanted to do engineering for several years now, more specifically electrical or mechanical. I have started to develop medical conditions due to exposure to chemicals in the lab. So...

i wish people would stop trying to call everyone profession "engineer". Software Engineers should be called software developers, and this confusion wouldn't exist. But anyways... All over the web, there are articles and studies (even a professor from UCD did a study and warned people against...

It's getting close, guys. Not much longer until Mentor Drakkith becomes Overlord Mentor Drakkith thanks to laser eyes, chainsaw fingers, and mind-controlled powered armor! And it all starts with this...

Died from a heart attack. RIP Pugsley. http://www.tvguide.com/News/Ken-Weatherwax-Addams-Family-Obit-1090564.aspx

Please help me understand this. The age of the universe is given as being about 13.8 billion years. The size of the universe is estimated to be 93 billion light years ( https://en.m.wikipedia.org/wiki/Universe) Since the oldest light to reach us comes from 13.8 light years away, why do we...

Homework Statement I've been told to calculate the age of the Universe at T = 1 \, \text{MeV}, assuming that a(t=0)=0. Homework Equations Now, I've already calculated the value of H at that temperature, which was around H(1\,\text{MeV}) \approx 0.6 \,\text{s}^{-1}. I've also shown, that in a...

Ever since Einstein showed us that time is relative, and that there is no such thing as independent time but a space-time fabric, and since we’ve got experimental results about the dilatation effect that speed and gravity/acceleration have on time: Is it OK to say that the universe started 13,79...

Current measurements of the age of the universe are 13.798±0.037 within the Lamda-CDM concordance model. My question is how is time measured given the relativity of time? Will all observers within the universe come to the same conclusion if they assume they are at rest? Is there are a way to...

Hi! (Wave) We have a machine, that knows the answer to the question: "Which is the age of the oldest genus, that ever existed?". The machine can only give the answers "YES/NO". I want to write an algorithm with time complexity $O(\log n)$, that implements that. So, we don't have a bound for the...

Maybe someone can explain the following twin paradox. There are two twins A and B. Twin A is shot straight up into the air with a very short and powerful cannon. Twin B remains on earth. Twin A goes up a distance and then falls back to earth. Which twin is now older?

Having been a junior design engineer 15 years ago and moved out of that field I am looking to get back into a science based career. I am taking a "Natural Science" degree with a maths/physics bias (lots of that) and can't seem to get any sensible job before I get this in place. I used to use...

Assuming the duration of a second didn't change, how fast would we age and die if the Earth wasn't moving, the sun wasn't moving, the galaxy wasn't moving etc etc? All this speed allows us to live the duration that we do right? So if it all stopped, how fast would we be born, age and then die?

Write code to assign true to isTeenager if kidAge is 13 to 19 inclusive. Sample program: #include <iostream> using namespace std; int main() { bool isTeenager = false; int kidAge = 0; kidAge = 13; <STUDENT CODE> if (isTeenager) { cout << "Teen" << endl; } else {...

The age of Mark now times the age of Amy a year from now is the square of an integer. The age of Mark a year from now times the age of Amy now is also the square of an integer. If Amy is 8 years old now, and Mark is now older than 1 but younger than 100, how old is Mark now?

Hi all! how much the unobservable universe is taking into account when decide the age of the universe, weather cosmologists use the speed of galaxies, the temp of white dwarves etc...because no matter what you take from the observable the unobservable could change it AND if all material...

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 am currently reading "Our Mathematical Universe" by Max Tegmark. From the book I learned a couple of things I find startling: 1. The event horizon, beyond which galaxies run away from us faster than light and hence cannot be seen by us, is about 14 billion light years away. 2. Our...

Hey guys, It is my first post here. I found this forum while looking for information, and it seems like a good place to learn all kinds of subjects. I'm from Brazil, and looking for some hints or guidance on career, Job and education. Reality may be different on your countries, but still, any...

How can we estimate the age of the universe if we don not know how big it is? It is often said that our visible universe may well be but only a small part of the actual universe, but I guess that the current estimates for the age of the universe come from running backwards the expansion of our...

Are the parameters involved in the calculations to determine the age of the universe completely different from the parameters used to calculate its size? If indeed so, : "thread closed." If on the contrary, one or several parameters have common use, it's like a snake that bites its own tail. Jozsef

I have been watching Cosmos and it is talking about how we determined the age of the Earth from meteors, since it's very difficult finding the oldest pieces of Earth otherwise and these are from the creation of the Solar System. Wikipedia: Estimate of the Earth's Age I think there is still...