Age Definition and 571 Threads

Multiple evidence suggest that the Pleistocene epoch (2.56 Million years - 11.6 thousand years) was about waxing and waning Ice sheets with the pace of the milankovitch wobbles superimposed on the Earth orbit. One intriguing element showing this is a multiple multi-millenium cycle in...

What real proof is there of the Big Bang? I have never heard anything that is convincing. And how do scientists determine the age of the universe, is it really calculated or is it just estimated?

At what age did Newton encounter and fell in loved with mathematics? I was really surprised when some sources said that he learned trigonometry during his college years and that he didn't really read Euclid's elements until after...

The age of the universe is 13.7 gyrs. The distance to the CMB is 13.7 giga parsecs, maybe I don't understand what a parsec is. Can someone explain?

Homework Statement Determine how old is a fossile where a 14C/12C ratio of 6.1 x 10^-13 is measured. 14C desintegration has a half-life of 5760 +- 40 years and proportion 14C/12C in living tissue is 1.17 x 10^-12. Determine the error in your calculation. Homework Equations Radioactive...

Is it possible to know BH age?

Well here goes. I have been looking at the posts in this forum and they have been stressing me out about my age. I am 27 and have finished an associates degree and am in my first year as a physics students at a state school. Depending on how the classes are offered I will finish my bachelors...

I did some research in regards to the age and metallicity of population I stars in hopes to come up with a novel solution to the Fermi Paradox. Anyways, while the metallicity of the oldest Population I stars can be tracked down to be something like -1 (10% of that of the sun) determining the age...

Hi, one of physician from Yale Univ explained first 6 days in bible can be very similar to 16 billion years if we understand relativity. His theory tells that first day after the big bang, temperture of the universe was around 3 trillion times higher which means frequency of universe...

A recommended lecture on the age and detailed structure of the Universe, listed in reference 1. George Smoot is a Nobel Prize in Physics laureate for his work on COBE.Primordial fluctuations simulation by Andrey Kravtsov: [/Color] Reference...

Homework Statement Neglecting other elements of the cosmological model, the inverse of the Hubble constant, 1/H_0 , tells us the time since the Big Bang - the age of the universe. If H_0 = 70 km/sec/Mpc, then how old is the universe? Homework Equations Given above The Attempt at a...

arXiv:0809.3627 (cross-list from astro-ph) [ps, pdf, other] Title: Alleviation of Cosmic Age Problem In Interacting Dark Energy Model Authors: Shuang Wang, Yang Zhang Comments: 12 pages, 3 figures, 5 tables, to appear in PLB Journal-ref: Phys. Lett. B 669 (2008) 201 Subjects...

Should Kids Be Able to Graduate After 10th Grade? http://news.yahoo.com/s/time/20081107/us_time/shouldkidsbeabletograduateafter10thgrade By KATHLEEN KINGSBURY Kathleen Kingsbury – Fri Nov 7, 4:50 am ET Can most children be ready for junior college by Grade 10?! This does seem to shift the...

Homework Statement Write a program to determine the age of an object given the creation date and todays date. The program must contain 6 user input statements (asking for year, month and date of creation, and year,month, todays date) and display the age of the object in days. I have...

http://news.nationalgeographic.com/news/2005/02/0217_050217_space.html How can we measure the cluster's age? Because astronomers are able to analyze light waves and thereby tell how long it took for the light, and the images the light creates, to reach Earth. The light that created the images...

or at 5 years later after you graduated college? Were most of you certain in what direction you wanted head to for the rest of your life? Were most of you fully matured by the end of your senior year in college (if a lot of you went to college that ) or were most of you unsure what you wanted...

I'm a junior in college and just transferred to my new school. whenever i meet new people, they all seem very surprised that I am a junior not a freshman. I'm getting really fed up with this! I've been thinking about lying to people from now on: tellign them that I'm actually a sophmore

I didn't know he had cancer. http://movies.yahoo.com/mv/news/ap/20080927/122253216000.html

I have a question regarding a probability question. If four people are randomly selected what is the probability that at least one is born on my birthday. This would make me think that I want to do the formula of 1 - (1/365)^4 which comes out to be 1 - .000000000005636405776 = .999999999...

I need help evaluating the age of a universe. Using a graphed representation of hubbles's law. The recession velocity is on the y axis, and the x-axis is in billions of light years. How can I approach this problem?

and at what age did you complete your undergrad and grad degrees and phD if you did it? I have a feeling that after one reaches thirty one cannot progress further... since most famous researchers were still young while making their greatest discoveries... anyways, my feelings aside... I...

, Like the mediums television and radio were deemed to have golden ages where the quality of tv shows and radio broadcasts were at their peaked? Now most critics say that these mediums have will never produced quality shows like they did during their golden era, and sadly tv and radio shows...

Test your brain's age here: http://flashfabrica.com/f_learning/brain/brain.html" Apparently, mine is 20...much older than most PF'er brains I am sure. I used the Google toolbar to translate the instructions:

i only would like to know, is it good for the father to have children at the age of 60 ? the mother is around 50-55

Homework Statement The technique known as potassium-argon dating is used to date old lava flows. The potassium isotope 40K has a 1.28 billion year half-life and is naturally present at very low levels. 40K decays by beta emission into 40Ar. Argon is a gas, and there is no argon in flowing lava...

Granpda and Grandma have 126 years togehter. How old is Grandma and how old is Grandpa, if Grandpa is twice older then Grandma was when Grandpa was as old as Grandma is now?

I'm reading the relativistic mechanics chapter, of Hestenes' New Foundations for Classical Mechanics. After the derivation of relativistic doppler shift is some general discussion of applications. The last of which (4) discusses Hubbles law: "distant galaxies are receding from the Earth with...

we have seen galaxies 13 billion lightyears away... this means that 13 billion years ago those galagies were 13 billion light years away.. however the light we see from them was emited about 700 million years after the big bang... so if we and those galaxies were at that same point(big bang) and...

Homework Statement The Age of the Earth is 4.5 × 109 y. Use the information given in the following table to calculate the ratio of the number of 238U nuclei at the present time to the number of 235U nuclei at the time of the formation of the Earth. Isotope Half-life...

In 1991, hikers found the frozen remains of a man in a glacier in the Alps, near the Austrian-Italian border. Carbon-14 analysis of tissue samples taken from the body revealed that the ratio of carbon-14 was 52.7% of what it was originally. Calculate the age of the body. A formula to...

I'm looking for some information regarding whether there is any evidence to support the widely held view that intellectual productivity peaks of an individual rises from their late teens, peaks in their 20s and starts to decline in their 30s. However, I'm not sure that search terms to use when...

http://www.reuters.com/article/blogBurst/science?type=scienceNews&w1=B7ovpm21IaD The Younger Dryas occurred at a time when orbital forcing should have continued to drive climate to the present warm state. The unexplained phenomenon has been the topic of much intense scientific debate, as well...

Is it accurate to say: The Light-Year distance from Earth to the Surface of Last Scattering (= CMB location) EQUATES TO the Age of the Universe (13.73 Gyr)? (ignoring units conversion factors). Would an observer, say 13.0 G Light-yr from us, ALSO see the CMB the same distance away...

For instance, when a person graduates from college , do you think they've learned all they need to know and so they just apply the skills they acquired in college to society? Or do you think people just stop feeding there mind after they had kids? Of course, you need to learn parental skills...

I just wanted to start by stating that I have been a long time reader of these forums (this is my first post) and want to thank all of you out there for taking the time to share with the rest of us your knowledge and insight. I have fairly recently become interested in the topic of our...

consider two interacting photons in the EPR effect. the photons separate and move towards different detectors 1 km in each direction. measuring the first photon instantaneously affects the other photon. how much has the first photon aged? how much has the second photon aged?

Does a photon age?

I'm watching a NOVA documentary "Secrets of the Parthenon", and the storyteller tries really hard to hype the ancient engineering technology, by saying our modern technology isn't capable of understanding/replicating what the greeks did. Is it me, or are they just suffering from the "garden...

If the Universe is 96 billion light years across and 13.7 billion years old, then doesn't that mean that the Universe has expanded faster than the speed of light? How can that be if speed of light is the speed limit of the Universe?

Homework Statement An extra solar planet is discovered that is 500 light-years away. It is found through spectroscopic analysis that the abundance of potassium - 40 to potassium - 39 on the planet is 99.9%. Assuming that the planet was created with equal amounts of the two potassium isotopes...

What do you guys think about living in an RV at a young age (meaning, not retirement)? Right off, I could see the benefits: You own where you live, but it doesn't cost as much as a house. Your home is mobile. You can take more things with you when you travel (by road). You can go on...

1. I'm just wondering exactly why people theorize that the universe is 13.7 billion years old. What is the accuracy of this estimate? 2. How certain are cosmologists that there was a beginning to time and what evidence is there of this?

As we all probably know, the twin paradox states that a twin goes off in a spaceship at c and returns, aging less than the twin on Earth because he traveled at c relative to Earth. However, relative to the spaceship, Earth is traveling away from it at c also, so technically, if I were on that...

My adventure of watching aluminum age... zzzzz... This is really just a post about something interesting I've been doing. Not a question thread or whatnot, which is why its in this section. ____ I have been using aluminum rings to make small pieces of maille armour. The rings are very...

It is all but gone, economies will not fund space probes any more, we have cocked up, missed our chance, instead of discovery we have wasted our money on other things, think i am wrong? we shall see, but i predict that any space mission will be a piddling effort in the future.

Here are two points of interest . 1) The american drinking age is 21 but yet at 18 one can do pretty much everything (and have pretty much everything done to them) imaginable. Although we know that this silly drinking law came into existence in the 80s because of the usual dirty and petty...

I must admit. I am slowly becoming a tech junkie. I have office 2007, and its great. I use microsoft outlook to link to my msn mail and my school email -sweet. I also downloaded Internet Explorer 7, really really nice program. I have 7 home pages that all load up each time I open IE and it...

Is it more difficult or easier to apply for a job in your area when you are old ?

We ususally find the age of the universe : T=1/H , is this true for all geometries of the universe,,, say for example flat universe with (lamda) = 0

"Dick Wilson, the actor and pitchman who played the uptight grocer begging customers "Please, don't squeeze the Charmin," died Monday. He was 91." http://news.yahoo.com/s/ap/20071119/ap_on_en_tv/obit_mr__whipple