Age Definition and 585 Threads

This is from the front cover of Mathematical Conundrums, CRC Press, 2023. << When Holly was twice the age Ivy was 15 years ago, Ivy was half the age Holly will be in 12 years time. How many years ago was that? >> OK, but why isn't the age of Holly and Ivy given?

Hi. If the early universe did not undergo rapid expansion but rather a more controlled growth like the human body, how old would the universe be given its present size? thanks

The age of the universe is said to be about 13.8 billion years. But, since time depends on the observer, would it be the same for a possible inhabitant of a planet in a galaxy about 10,000 million light years away that is separating from us at 60% of the speed of light?

We think the age of universe is 13.8 billion years old . I think we are wrong. Let’s pretend we can go outside of our observable universe. Also, let’s say we can go so far out that we do not even see a spec of light from our universe. We see nothing at all, total darkness. When they finally do...

In other words: Does a reference system, in the relationship between the displays of its synchronised clocks, have a specific property that is independent of any reference system? Is this particular relation of events in the form of displays of spatially distant clocks at rest the same from the...

I understand that many of the extreme distance objects were incorrectly calibrated for their distance and subsequent age. I have been trying to track down the related articles detailing the error with the applicable mathematics. If anyone knows where I can get the related calibration papers it...

Lucile Randon, known as Sister André, has died a few weeks before her 119th birthday. https://www.npr.org/2023/01/18/1149748001/world-oldest-person-sister-andre-lucile-randon-france-nun What stories she could tell!

Although I understand that time does not exist prior to the big bang, it's still a difficult concept that the universe - the sum of all that is and ever will be - has a beginnnig and therefore an "age." While we could say that time as a dimension began at the big bang, and it was meaningless...

https://academicminute.org/2022/11/joel-frohlich-university-of-tubingen-how-to-spot-pseudoscience-in-an-age-of-conspiracy-theories/

I would like to let my 6 years old son play and learn about electricity or electronics. I have searched on the Internet and what comes out are mostly kits with an arduino or a clone, which are very interesting but not exactly what I'm looking for. I have seen a kit that teaches about electricity...

Hi. At age 70 having retired and now having time to study I am just completing my first-year physics degree at the open university with good results. It is I think healthy and good to have an ongoing ambition, mine to get a job with the ESA before I am 80, maybe but clearly optimistically to be...

NOTE: I am attempting to convey the equations in this post into LaTerX format in Post #19. My result is way off. It is about 7.44 x 10^9 years. The values I use are: 1/H_0 = 14.4 X 10^9 years, M = Ω_m = 0.3103, and L = Ω_Λ = 1 - Ω_m = 0.6897. The equation I start with is the following. dt =...

The Wikipedia references is https://en.wikipedia.org/wiki/Recombination_(cosmology). It says: Recombination occurred about 370,000 years after the Big Bang (at a redshift of z = 1100), and the cosmic background radiation is infrared [and some red] black-body radiation emitted when the universe...

It is reported that todays issue of Nature Magazine includes an article reporting a correlation between typical total life time gene mutations and typical life span in a variety of species. I do not subscribe to that magazine and have not it or its abstract on the web. But ... in an article...

The integration tool I am using is https://www.symbolab.com/solver/definite-integral-calculator . The following are the values of the five variables in the Friedmann equation with references of sources. I have also defined single letter variables I used for convenience...

https://people.com/tv/betty-white-the-golden-girls-and-hot-in-cleveland-star-dead-at-99/ May she RIP. Poor soul, and she was so close to turning 100 and in good spirits about it. :(

How can current gene editing technologies like Prime Editing can be used to reverse all age related mutations that negatively affect some type of cell like neurons?. According to this article (you need to click on the "toggle reader view" button in firefox in order to read it without registering...

Is there an up to data source of data on the number of vaccines administered in the US by age and sex? And similarly is there up to date information on the number of Covid-19 cases by age and sex, as well as number of adverse events from Covid-19 infection?

Last two practice age word problems for today. More tomorrow for sure. 1. Ten years from now, Orlando will be three times older than he is today. What is his current age? Let x = Orlando's current age. Let x + 10 = Orlando's age 10 years from now. x + 10 = 3x 10 = 3x - x 10 = 2x 10/2 = x...

The ages of Abraham and Adam are in the ratio 5 : 7. Four years from now, the ratio of their ages will be 3 : 4. Find the present ages of them. I never saw an age problem involving a ratio but let's see. Abraham to Adam = 5 : 7 Let x = present age of Abraham and Adam. Age of Abraham = 5x...

My wife was listening to a program on Youtube that was discussing the collapse during the late Bronze Age. I caught part of it when the narrator was discussing a series of large earthquakes in the region (Aegean Sea and Eastern Mediterranean). The narrator also mentioned an 'earthquake...

Could someone age and get old without any chronic disease, even the most common diseases like diabetes, heart attack, high blood pressure, etc... not including hair loss, presbyopia, or any disease that is temporary and can heal completely Is it possible to achieve this by change in lifestyle...

https://www.washingtontimes.com/news/2021/apr/17/founder-of-adobe-and-developer-of-pdfs-dies-at-age/ https://en.wikipedia.org/wiki/Charles_Geschke

How can we know the age of the universe, with time dilation due to the mass and velocity of matter which condensed after the big bang. If time passes at different speeds depending where it is perceived, does this not make the age of the universe somewhat moot.

Experiment 1: Astronaut travels away from Earth at near the speed of light, then travels toward the Earth at near the speed of light. Einstein tells us she barely aged, but red shift/blue shift don't seem to agree with that. While traveling away, both Earth and astronaut observe each other...

The age of the Nebra (from Germany) Sky Disk (claimed to be the oldest known representation of the heavens) is in dispute. It was found in the black market, so provenance is unclear. NY Times article here.

honestly just need some help here i understand the physics just not how to code it or the syntax of python

From a cursory glance, this seems to be a commonly posed question. While, I do apologize for what may be duplication, I hope people will keep in mind that as each individual's circumstances are unique, so may the opinions & answers they engender. I am considering going back to university to...

I came across a story of Clair Patterson, who investigated the age of the Earth through isotopic analysis of lead in uranium, which evolved into a study of lead in the environment and the discoveries of widespread lead contamination and scientific misconduct on the part of various persons...

I don't intend to sound macabre, but I was having this thought if I have to quantify the probability of someone dying given his age (in days) how would I go about quantifying that with a minimal accuracy (ok if it's not accurate but I just need some number with days). Has anyone ever worked out...

Bob, Alice and Ted are all on earth. Bob leaves Earth traveling at .08 light speed for 6 months out then turns around and heads back to earth. Effectively he has been traveling for a total of 1 light year. Ted leaves Earth at the same time as Bob but only travels at .04 the speed of light for 3...

<mentor note: moved to General Discussion> Will humans be able to live up to 120 years of age? I mean one day in the future will some scientific advancement allow most if not all of us to live till ~120 in decent health? Disregarding things such as accidents, viruses such as Covid. Thanks

Hello, I thought that it was easy to calculate the difference of aging on different planets, just by knowing the difference of gravity between them. But it is not so easy... I will also consider that the difference of gravity will not reduce our age because of other reasons (on muscles, on...

I haven't gotten to multiple variables yet in algebra, but I tried to solve it this way. x - 12 = 3y -72 with y = - 12 + x Then I multiply 3x - 36 -72 = 3x -108 Next step is +108 to both sides to get 3x= 108, and then x = 36 So she was 36 72 years ago and is 96 now. The math seems to...

I've learned that the surfaces of places like the moon and the surfaces on Mars corresponding to the Noachian period signify relatively old surfaces because weathering and erosion tend to make those cratered surfaces smooth. However, I heard a professor mention that this is also true for icy...

Hi all, First time posting. Thanks in Advance for the guidance provided. I am entering Uni to change careers. I have worked in IT and Software development industry for 20+ years. I have a desire to enter into Engineering - Electronics. I am enrolled to undertake a Engineering Sciences degree...

2) The Agency for Healthcare Research and Quality reported that 53% of people who had coronary bypass surgery in 2008 were over the age of 65. Fifteen coronary bypass patients are sampled. a) What is the probability that exactly 8 of them are over the age of 65? b) P (less than 10 are over...

An article published Monday in "Computers, Materials, & Continua" identifies leading indicators of which patients will go on to develop ARDS (acute respiratory distress syndrome). From the abstract: Among the features identified as possible indicators: A pdf of the full article can be...

I'm quoting from Wikipedia the article about GN-z11 (the oldest and most distant known galaxy): "At first glance, the distance of 32 billion light-years (9.8 billion parsecs) might seem impossibly far away in a Universe that is only 13.8 billion (short scale) years old, where a light-year is the...

Famed Hollywood Actor Kirk Douglas has Died at Age 103 https://www.tmz.com/2020/02/05/kirk-douglas-dead-dies-103/ and on wikipedia: https://en.wikipedia.org/wiki/Kirk_Douglas My recollections of him are in the movie: The Vikings with Tony Curtis and Janet Leigh (epic yarn of Vikings and...

The arrival of quantum computing reminds me of "the manhattan project" and "the sputnik alert" when physicists are highly demanded. And this makes me wonder if the age of quantum computing means the better future for physicists since the development of quantum computers needs at least...

Over in Scotland you can start prep school at 3 (even younger at some private schools). There is a bit of discussion out here in Aus, due to profiteering in day care centers and the belief it lays a better foundation, that the government lowers school starting age, like Scotland, to 3...

Hi everyone. Due to certain unfortunate circumstances, I had taken a bit too much debt and not put in my savings. I have some concerns about whether I will be able to retire comfortably after age 65 (I am in my early 40s now). I was wondering if any of you have been in similar financial...

Recently a news article stated objects found in the universe have different ages, could it be that our universe is inside an already existing universe and that is why it is able to expand so easily.

The age of the universe at the recombination is reported everywhere on the internet as 379,000 years. I would be grateful if someone could point me towards the paper where this is calculated.

(I swore to myself I would never ask a relativity question again...oh well) I don't know why I can't find anything about this in a search so I guess I'll just have to ask. Is a twin that takes off to Mars to stay, younger than a stay at home twin or is it ambiguous? I would think that this...

Any woman here (or know someone who does) who had ivf (In Vitro Fertilization) done between age 42 to 43? How was it?

Summary: Age of the universe Just a bit of a fun here, not sure how this equates into anything useful. So we believe the "age of the universe" to be around 13.8 billion years, it seems to me that this is a relative time frame based on the rate of flow of time on earth. I find myself wondering...

I was reading this Quora post, and it seems to say that the late, great Stephen Hawking has proven this. https://www.quora.com/Have-scientists-disproved-Stephen-Hawkings-theories-of-the-universe

Hi everybody. I'm 40 years old and have been working sales and retail jobs for most of my career and have decided that I'm going to back to school part time with eventually going into mechanical or bio medical engineering. I plan on taking linear algebra and calculus 1 in the fall of 2019 to get...