Age Definition and 571 Threads

I was just thinking... :-p perhaps this is a dumb question & the two are unrelated. But, they say the universe is roughly 14 billion years old. My question would be, relative to who?

Could some one please help me with the following question. The ages and salaries (in thousands of $) of 10 employees in a firm are given below. Age - Salary 28 - 17 31 - 22 31 - 28 35 - 20 40 - 26 44 - 30 45 - 32 48 - 18 53 - 33 67 - 42 What is the...

Coincidence of Universe age in $\Lambda$CDM and Milne cosmologies I wonder why... Just another example of the degeneracy* perhaps? Garth (*Now accepted for publication in Astrophysics and Space Science)

Hey, I have been set this question, and I am finding it extremely difficult to begin. So much information is given, I don't know how to start to answer it. Also, some of the terms are confusing... A living specimen in equilibrium with the atmosphere contains one atom of 14C (half-life =...

I'm curious in the processes used to date the age of a human fossil, not in terms of how many thousands of years ago the human died, but the age of the human when they died. Are there any special processes that are used to determine this, or are humans mearly matched up in terms of degeneration...

hi, At what age you competed your phD? As I have calculated, I would have completed my phD right at the age of 28, is it too LATE? I have heard that some professors completed their phD at 23 or even 21. terrible.. ... Twukwuw.

Any Star Trek fan will recognize this idea. http://www.newscientist.com/article/mg19025474.100-all-the-pleasures-of-alcohol-with-no-downsides.html

Can someone please explain what's going on with Hubble's constant. I understand that to calculate the age of the universe you need to use the relationship; t=1/H. But I don't understand how you get the Hubble's constant into a format that you can use. I've been told that you get a Mpc in Km...

Why is it that no one over the age of fourty can receive the fields metal?

Hi, I've just got the following question for you guys... Say that Bob is traveling away from the Earth at 0.9999c in a glass spaceship. Phil, who is on Earth and can see Bob’s spaceship, notices that Bob’s clock is running slow. That makes sense. HOWEVER, since there is no ideal frame of...

Got stuck in this question, the question asked to use friedmann equation to show that the age of an empty universe (average density = 0) is τ=1/H₀ where H₀ is the present day value of Hubble's Constant. Well, i got the friedmann equation by put the value ρ(average)=0 but the trouble is...

Can someone explain it to me in terms of Hubble's Law? And how can i Prove it?:confused: Cheers!

Natural Uranium found in the Earth's crust contains the isotopes A=235 and A=238 in the atom ratio of 7.3*10^-3 to 1. Assuming that the time of formation of the Earth these two isotopes were formed equally, and that the mean lives are 1.03*10^9 years and 6.49*10^9 years respectively, show that...

I have long wondered about this. When light takes x number of billion years to reach earth, we judge that the star emitting the light is x number of billions years old. I cannot understand that the star would be the same age as the distance it is away from us. If I was riding a spaceship at the...

I'm just curious as to the average age a person starts college coming straight out of high school. I started when I was 16.

What are the methods currently being used to date the Earth and/or universe? I was talking to a buddy and he was on a role about 10,000 and the age of the Earth and the unreliability of carbon dating. What are some of the methods now being used? Nautica

Hi, I'm trying to figure out the average age in a solera process. The equations are: A[SIZE="1"]n = (2/3)(A[SIZE="1"]n-1 + 1) + (1/3)(0) B[SIZE="1"]n = (2/3)(B[SIZE="1"]n-1 + 1) + (1/3)(A[SIZE="1"]n-1 + 1) C[SIZE="1"]n = (2/3)(C[SIZE="1"]n-1 + 1) + (1/3)(B[SIZE="1"]n-1 + 1) With initial...

Hello Is there any age limit for graduate study (Masters/PhD) in Sciences in US universities? Thanks HMS

A new step towards Ice Age Park has been made: What more does it take to clone a Mammoth?

At what age do most boys stop growing, and, if one has already experienced the major growth spurt during puberty, at what rate will he continue to grow? I looked a little on google, but most of the results seemed to be sites selling growth hormone of dubious quality.

[SOLVED] How Do We Know The Age Of The Universe For Sure? Cosomologists estimate the universe 10-15 billion years but this is only by dating where the farthest reaches off light go. We only know 10% of our universe, the other 90% is dark matter. So how do we know that out univere isn't much older??

I'm a real noob in physics. After reading some things about special and general relativity I came up with a question based on a statement i saw on a physics book (don't remember which). If my memory is not failing me i remember having read that photons have exactely the same age now than when...

In the quest for something "different" on this forum, I'm posting a poll to ask whether the current voting age of 18 in the U.S. should be raised. The reason I ask is that I'm wondering if the majority of 18 year-olds in our current society (not the way the society was 20 or 50 or 100 years...

This might be the last quiz I'm posting here!:-p http://www.blogthings.com/whatagequiz/ I act 23, and I'm 23.:cool: (someone was 20 and act 7:biggrin: . ) I'm sure we'd have a bunch of kiddies around here!:-p

If you could choose one age to be for the rest of your life, what would it be? You would still have the same personality, mental abilities, and memories. If you picked being in the body of a child, you wouldn't have the social and legal restrictions of a child, but you'd have the physical...

The first estimate of Hubble’s constant, 400 km/s/Mpc was too large by a factor of over five because of systematic and observational errors. This led to a ‘Hubble time’ of only 2.4 Gyr for the age of the universe, the problem was that objects within the universe, e.g. the Earth were known to be...

Is it very risky for a 27 year old to begin study in an aerospace engineering program? If I get a b.s. in 3 or 4 years, would age discrimination be a problem in getting an aerospace job? Or any engineering field for that matter? Thanks.

You know what to do. Chronological Age. In Earth Years. If you please.

im 31 and i would say people here are really young, am i right?

There are 2 people, who are twins. One was born on earth, and the other was born in space. Because Earth orbits the sun, so the twin born on Earth is like traveling on earth. So, would the twin born on Earth age slower than the twin who stayed at space?

If Ice Age suddenly come back, What will people do?

Hi everyone, Could someone tell me the details on how to calculate the age of the universe? I've read online that it is about 13 billion years old but I can't find anywhere that tells me how they got to this number without confusing the hell out of me. Can anyone fill me in? Thanks.

Just want to share with you the content of an article that i read this morning on the train. Research groups (i believe in the UK) have done extensive studies among scientists that concluded that you reach your TOP level at around 30. We all know that Einstein was around 25-27 when he wrote his...

could anyone give me some informatoin about einsteins threory of the twin paradox thanks Jack age 14

Age of the universe -- absolute or relative? I have a question. Consider twin physicists Al and Bert who devise a new method (far better than measuring cosmic microwave background) to determine the age of the universe. They do so to an extraordinarily high degree of precision – stating it...

Hi i am confused as to how to calculate the age of the universe with redshift say for example The age of the universe now is 13 billion years old (and a critical universe). How do i find the age of the universe if it was a redshift at say 10?? Do i have to find the scale factor first? I...

I was just thinking to my-self about the copper and iron age. I know why they mean but out of curiosity does anyone know why is it named Iron and Copper Age...just out of curiousty..

I need some one that can look at the rusting of a knife and determine about how old the knife is, because I have a knife that is from Pune city India, and determine how old it is might help extend the range of how old the city is. The knife is more of a dagger and they haven’t used the term...

Hi all, I've been struggling with an idea lately and was wondering if anybody could shed some light on it. It seems simple but i don't think the answer is very obvious. The best guestimate for the age of the universe at the moment is 13.5 billion years old. If we could travel back in...

Our current interglacial period has lasted about 11,500 years, now the common figure is that interglacial figures usually last around 11,000 years. Has anyone heard any convincing evidence that the next ice age is indeed going to be upon us soon?

As most of us know, we are currently in the midst of a fantastic explosion of information unlike any seen in human history. There has been speculation about an approaching "singularity" of information flow - really a nearly vertical spike in the rate of technological progress made as a function...

... asked what to study if he wanted to investigate creationism versus evolution. I advised continuing physics and chemistry and avoid having to learn flawed theories as paradigms. So, predictably, I was challenged to expose some of them. I choose for the problems in the 100,000 "ice age" cycle...

I'm not a real tall guy, about 5'6 and I'm 18...will i get any taller than i am now? I read somewhere that we reach full height at 22 or 23, i'd google it, but u guys are better than google :-p

Human genes evolved for the stone age. Therefore we must adopt stone age habbits if we want to stay healthy, how true is this statement?

Okay, one of my friends has a daughter who's a little over a year old. She loves to roll balls around, and I happen to know their floor has a sort of natural slope to it, so one can predict where the ball is going to go. So, I picked up one of those plastic bowling sets. I now notice the...

Meaning of "age of universe" This question may have been addressed somewhat indirectly in other posts, but I'm interested in specifics. Exactly what assumptions about time (and the universe) are implied by a statement like, "The age of the universe is X years old"? In particular, does this...

If not, then their incorporation within any Time-dependent theory has to explain the Universe before any Photon pressure was exerted upon matter in the early Universe. Does a Photons Frequency of energy actually relay something about it Age?..in the context of its source?

We well know that time is relative according to the Special Theory of Relativity. So, a person on a spaceship close to the speed of light (~c) could go on a trip for some years, return and find out that he is still young, while his friends or relatives are already very old or gone. This happens...

As you go back in time,the gravitating bodies come closer and closer.So the gravitational field gets more and more intense.We know that clocks move slower in the presence of a gravitational field---so as you go back in time the clocks become slower and slower.So how can we say,using today's...

It is currently admitted that the best findings in Physics are produced by young scientists, being the Einstein's annus mirabilis a good example. But is it generally true? Is there a best age to make a creative research? If so, Why? What factors are determinant to peak the most relevant...