Age Definition and 571 Threads

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...

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:

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...

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:

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 ( successful 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...