Age Definition and 590 Threads

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-Dependant 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...

Just thought of this, probably no validity to it, but just a thought. Most planets start with hot cores, they eventually cool, and shrink. Their cooling and shrinking results in more plate tension on the surface because of the shrinkage. This would create more mountain ranges on planets. So...

Who knew water could age you millions of years?? There are many of you out there who don't believe that the world is millions of years old. But then how do u explain the fossils that archaeologists have been digging up? Of course there's the theory that days were much longer then. There are...

Recently I read that Universe is 156 Billion Light Years in size. Even if every thing moves at speed of light, a 13 Billion years old universe should not have radious more than 13 Billion years. Is it Correct? Can the rate of expansion exceed speed of light?

I was discussing religion/physics with a girl who is a strong Christian and although she was massively misinformed in almost every topic dealing with physics, she did bring up an interesting point that I had not heard before. She said that she read somewhere that there were conflicting views on...

I am faced with a problem at school, which I strongly believe i answered correctly to, but I have still gotten it as an error, so I would like to know what you would reply to this: I am x years in year x2. I am born in the 20. century. A: When am I born? B: How old am I in year x2...

http://www.newscientist.com/news/news.jsp?id=ns99994888

I'd be interested to hear people's comments. One thing especially. The current estimates are of the order of 20bn yrs and 5bn yrs respectively (the actual values are not important ... it's the 'order' of the ratio that interests me). So, our sun has been around for a quarter of the age of the...

This is my first post, so I am going to get straight into a double barreled question that has been bugging me for a while. (1) How long does it take for stars to conglomerate around a general loci, in order to form a proto-galaxy. ? I ask this in the light of the most recent Hubble images...

A friend told me that if a galaxy is 13 billion light years away, it means the universise is at least 13 billion years old. I don't get it? So, light years does measure time? Or is it because this new "galaxy" found is the oldest galaxy in existence? He explained it to me that it took...

Just curious. Btw, I'm 18.

I have a serious question which has been on my mind for awhile. I was thinking about the problem three months ago, and then forgot about it. My question is this, suppose that the theory of relativity is totally wrong ok? And so now I want to try to figure out how old the universe is, let's...

My sister and I never had any cavities as kids. However once my sister hit around 18 she got a couple. I just went to the dentist and got word that I have three all of a sudden. As a kid I maybe brushed once a day, nothing else. Now I brush twice a day, use floride rinse and floss. So why...

after anuclear war as most know a nuclear winter will ensue. many people don't know however most dot know that this will cause a snowball Earth with the entire planets surface covered in snow and until another million or so years the atmospheres gasses won't trap enough heat to melt the snow but...

Question When astronomers find a new star, say 15 billion light years away, why do they immediately relate that distance with the age of the Universe (the distance to the Big Bang point)? --->cause if the Universe were like a balloon, and the Earth and the star were in the the surface of...

Please can somebody explain how the age of the universe can be determined using Hubbles Constant? If the constant is taken as 10km/s (just for the sake of easiness), how can this be figured out using calculations? I appreciate any help!

Please can somebody explain how the age of the universe can be determined using Hubbles Constant? If the constant is taken as 10km/s (just for the sake of easiness), how can this be figured out using calculations? I appreciate any help!:smile:

Some of you are probably wondering how I thought up of the following question...I don't know really know either. At what age does a male gain the capacity for sexual arousal (through cognition...the whole span, except ejaculation)? I propose that it is as early as 5 years of age...even...

I've counted 5 just since I've been here. Might I suggest a profile search. Those who want to volunteer their age probably already have it listed

addenum to AGE VS Experience debate or You'll understand when you're older This was origninally a sub-topic that was started in the general forum about age, wisdom, and experience, and how they all interact. Some people had some good arguments, so I wanted to add something to it. It's my...

If the light reaching us from a distant galaxy is said to has been traveling for 12 billion years, then it is said to be 12 billion light years away. Did someone forget to consider the fact that the galaxy has been moving away from us in the meantime? The distance must be at least the double.

What is the greatest Mathematical puzzle that is unsolved? and why?

When the media report on distant objects and state that the light from that distant object was emitted 10 billion years ago, for example, I wonder where the object is now, and more important, how long did it take the object to arrive at the place where it shined. How is the transit time from...

Are we in the middle on an ice age now? I do not think that we are but my friend does.