Age Definition and 590 Threads

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

Edwin Hubble uses the red shifting technique on light emanating from the furthest known galaxies that are 12 billion light years away to estimate the age of the universe. With this technique they say the Universe is expanding. The further away the object the faster it is moving. My...

I am having trouble understanding how to use Hubble's constant to calculate the age of the universe. I know that 1/H = a distance on time equation, thus the age can be worked out i also know that the answer is in seconds and generally to a high power such as 17 However what puzzles me is...

I have read some article about this crater in Lybia, but still have no idea the age of it. Anybody knows that? Thanks you.

I'm in a college Physics AP course, and I was wondering: Is there any way to calculate the age of the Earth using just a easily understandable physics method?

It would perhaps seem more beneficial for organisms to have evolved so as to live forever, excluding of course any trauma induced from injuries, or being consumed by predators. Life is so complex, what stopped it from simply acquiring the ability to live forever?

Harry Potter was 11. Sabrina was 16. Jesus was 12? What do you think seems like the right age to learn that you have magical powers? Does it happen on your birthday? Does someone come down from somewhere and whisper it in your ear? Do you just suddenly start accidently blowing things up...

Hello Everyone, I'm a new member to this interesting forum, just joined. I was watching a program on the Discovery channel about the Universe. They were talking about the size and said it was "157 billion light years across. I watched the program 2 times to make sure I got it right...

At least I think that's the field I'm looking for. I need to know if there is a way, through collagen collecting, DNA testing with PCR, etc., what is the defining characteristic in a piece of a BONE that would tell that it is human, i.e., is it possible to tell the # of chromosomes, or some...

You know , the age limit you reach where you used up all your youthfulness. when does your rebellious meter start decreasing? For me its 20. I do anything to be a teenager again

Carbon dating! A 5g charcoal sample from an ancient fire pit has a 14C activity of 63 disintegrations per minute. A living tree has a 14C activity of 15 disintegrations per minute per 1g. The half-life of 14C is 5730 years. How old is the charcoal sample from the ancient fire pit...

This is the question which I'm working on: When an animal dies the radioctive carbon content of its body has an activity of 12 counts per gram per minute. Some animal remains are found to have an activity of 3 counts per gram per minute. If the half life of radioactive carbon id 5000 years,how...

In another topic the oldest black hole has been found. "Sitting at the heart of a distant galaxy, the black hole appears to be about 12.7 billion years old, which means it formed just one billion years after the universe began and is one of the oldest supermassive black holes ever known."...

I've heard stated by experts that the approximate age of our universe is about 13.5 billion years of so. The thing that doesn't make sense to me about this is that we can see more time than this. The famous Hubble deep field shot taken in the northern hemisphere shows about 13 billion years or...

I noticed that there are normally age limits to donating blood, 17 being the most common. Why must there be an age limit? Isn't a 16-year-old's blood just as good as a 17-year-old's? I can't imagine it would be that bad for a person's own health to donate blood. Is it because of responsibility...

i've had a few people remark on how 'ancient' they thought someone was and this got me to think if everyone who exists today going back 1000 years has 1048576 relatives wouldn't most people be related and wouldn't unique physical characteristics be from inbreeding?

Any regrets about the past, or do you wax nostalgic for a special time of your life?

http://news.bbc.co.uk/2/hi/programmes/from_our_own_correspondent/6550029.stm Under the Atoms for Peace Program, the nations which had developed nuclear energy were supposed to share the technology - for peaceful uses. http://en.wikipedia.org/wiki/Atoms_for_Peace...

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 13.4 billion years old (and a critical universe). How do i find the age of the universe if it was a redshift at say 0.6?? Do i have to find the scale factor first...

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 13.4 billion years old (and a critical universe). How do i find the age of the universe if it was a redshift at say 0.6?? Do i have to find the scale factor first...

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 13.4 billion years old (and a critical universe). How do i find the age of the universe if it was a redshift at say 0.6?? Do i have to find the scale factor first...

I have applied my supreme translation skills but it still can be somewhat bad english. Any way, here it goes. So, there were 2 men sitting in a park. - So, got any kids? - Two sons. - Which school are they in? - They aren't going there yet. - So, how old are they? - Their ages product...

Homework Statement Assume that the current age of the universe is 13.4 billion years old, and that we live in a matter-dominated, omega_m = 1, critical universe, what is the age of the universe at redshift 0.6? HINT: use the current age of the universe to pin down the proportionality...

hey everyone, do you know the formula used to compute for the AGE of a substance if its half-life and fraction remaining are given? please help me.. thank you..:smile:

1. An archeological specimen containing 8.7 g of carbon has an activity of 1.6 Bq. How old (in years) is the specimen? 2. Decay constant for Carbon= 0.693 / 5730 yr = 1.21 x 10^-4 1.6/8.7= 0.1839 activity per gram of C 0.23 is Activity of C at t=0 3. ln(0.1839/.23) =...

Homework Statement A pair of twins live in (city). one drives around the world in his fast blue car, leaving the city in a fixed direction with a constant velocity v. The proper circumference of the Earth is 2PiR - ignore the rotation of the earth. 1 -What is the age difference between the...

Hi, I'm doing a bit of research into white dwarfs and cosmochronology as part of my uni course, it seems like a fantasticaly interesting field but I've got a couple of questions which i haven't yet been able to find answers to. Firstly, several papers i have read refer to a luminosity of...

none of the forums seemed to be an exact match for this question, so i placed it in the most general forum. i don't understand why scientists think they have an accurate answer to these questions. i understand that they are using the doppler effect with regards to light waves. but...

So, now that graduate school is just around the corner, I'm left with the daunting task of picking a school and research group that I'd like to work with. This question may sound silly, but all other things being equal, but what age would people recommend a research advisor be? The more I think...

James is five years old now and Emma is four years older. Form a relevant equation and use it to find out how many years it will take until James' and Emma's age in years, multiplied together will make 725 years. I'm needing help to form the equation. Anyway, from what I've done so far, I...

Some mathematicians note that their intellectual powers (at least where mathematics is concerned) seem to diminish with age, for instance Hardy. Was this griping a mere excuse for their lack of talent to begin with? Other prodigies appeared to have retained their mathematical fecundity into...

I'm currently finishing my phd in astrophysics and ill be 28.5 yrs old when i do so. I'm now looking for a post-doc job and it seems to be difficult. I've attended top undergraduate and graduate schools but seem to have no offers or call-backs on my applications.I'm being told that younger phd...

Hi, I was hoping you guys could give me your opinions on mature age study. I never finished high school and have worked and traveled for the past few years and then its as if my brain kicked in at around 22. I taught myself algebra through to elementary calculus and passed the entrance exam...

Here you can see how the Greenland isotope proxies in the ice core records have been studied very carefully on temperature sensitivity: http://www.ipsl.jussieu.fr/GLACIO/hoffmann/Texts/jouzelJGR1997.pdf The result is figure 4 (pag 7) where the temperature variation is derived from a...

Last week, I went to register myself for an additional course (graduate) in one of my free slots. I was given a form which required the consent of the professor teaching that course and my faculty advisor. Both of them had no objections with me attending the class. When I went to return the...

The European Renaissance concurs with the transition in climate from the Medieval Warm Period to the Little Ice Age. A long list of famous winter painters is headed by Pieter Brueg(h)el the elder, showing a harsh climate, which nontheless did not seem to affect the further development of the...

Grandpa: "My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 100 years. Can you tell me my age in years?":rolleyes: