Age Definition and 590 Threads

I've read that the universe is 13.7 billion years old. Also, I've read that time passes "slower" when an object is close to a large mass as opposed to an object close to a smaller mass. Take two galaxies. One galaxy is half the mass of the other. At this moment, has 13.7 billion years passed...

When spermatogonia divide by mitosis, do there telomeres shorten ? I am just trying to ask if reproductive cells age as well as with the rest of our bodies cells ? If so wouldn't a baby born from old parents have a shorter than average life expectancy due to older or more aged DNA ?

Probably they do. However, I've heard there is a difference between guys and girls in that respect.

What are the prerequisites for great new scientific ideas? Intelligence and creativity? Assuming these two variables-feel free to add more if you wish-does the mind ever peak at a certain age in either of these two areas, be it physically or simply subjectively? It seems the true geniuses do...

Hi, I was curious how one would solve this problem: In a town, there are 1850 trees along public roads. Each year, the town has to remove on average 25 trees of random age because of various reasons (natural death, fungus infection, insects, hit by cars, roots damaged by construction, etc.)...

Hello During the life time of an unstable particle, can it be said that this particle ages? Can the relativistic muons that zip through the atmosphere be considered to age slowlier wrt the Earth, or should a different concept be used? If age does make sense when speaking of a particle, is...

Have ceramics come of age for use in ic engines? from what i can make out they do not improve performance by much, but do make the engine more reliable, coating the piston crown and cylinder head seem to be the favorite use, or components that require little or no lubrication..

If you divide the distance light traveled since the Big Bang by the Planck length, you get a factor of 8.17722722*10^60. ((1 / (70 ((km / s) / Mpc))) * (1 (light year / year))) / sqrt(((h / (2 * pi)) * G) / (c^3)) = 8.17722722 * 10^60 If you cube this value, you get the factor by which the...

Hi all, Does anyone knows of any Astronomy graduate who earn Phd or Bsc or Msc at age between 35-45? Whats the oldest age ever to get Astro Phd? I have a Bachelor of Science in Physics ( Boston , MA) and I am 37 years of age, I have applied ( sucessful application) to do Master ( One...

Trying to understand special relativity, in particular the influence of speed on time, I came up with the following picture, and wonder how accurate it could be. Suppose a spell is cast on you in your rocket drifting through space that stops everything moving all over the rocket: from the...

Is there any true way to age the universe? i mean, I've done some research on this, and from several points of data, i can honestly say no. look at gravitational lensing for example. unless you're like a master at picking out what is a mirror image or something, you're already messed up, but i...

Many people finish their BSc in physics at an average age (21-23). What i was wondering is, for a career in physics does age play a role in it? many of the smartest or well known physicists have their phd by 23, would getting it at 27 or 28 be any worse? What matters more age, experience or...

http://www.iceagefloodsinstitute.org/ http://www.iceagefloodsinstitute.org/aboutfloods/puzzlesolved.html http://www.sentex.net/~tcc/sgfcrit.html Question and answer with geologist Dr. John Shaw http://www.sentex.net/~tcc/sgfrep.html These articles and many others disclose a...

Today I'd like to draw the attention to the end of the last glacial period. Those who have looked at ice core graphs may recall that the Antarctic ice cores appeared to react first around 17,000 years ago and then with a relative mild change in isotope values (interpreted as temperature change)...

The Solar System is traveling around 155 miles a Second around the Milky way Galaxy. There are 31,556,926 seconds in a year. We will round off the Age of our sun from 4.76 Billion to 5 Billion Years for easier figuring. If we Multiply 31,556,926 seconds by 5 Billion Years we get...

I like to discuss the in my opinion absurdity of the age of the universe claims that are made. How can there be such a thing as one age in for people who have an understanding of SR and GR? For an object that traveled at light speed during the big bang explosion the age of the universe is...

Hey PF ppl, I assume the lega age in the United States is 18 If i am not wrong? Is there some States has the lega age as 21 or more or less than 18? What about old days? in the 1800's? 1700's? I try to google, but goolin mission failed :frown: Thx ppl for help! Links are very...

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: An = (2/3)(An-1 + 1) + (1/3)(0) Bn = (2/3)(Bn-1 + 1) + (1/3)(An-1 + 1) Cn = (2/3)(Cn-1 + 1) + (1/3)(Bn-1 + 1) With initial state: A0 = 0 B0 = 0 C0 = 0 The question is, what is C as n goes to infinity?

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 wich). If my memory is not failing me i remember having read that photons have exactely the same age now than when the...

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...