Life Definition and 1000 Threads

If there is enough gravity and the universe starts to collapse in on itself, would life forms that live during this phase of the universe get younger as time passes and they would need to expend energy to stay old?

Hi I am a student who wants to know what factors apart from environmental factors affect the life and performance of a generator. I think that the load also would affect the life if so How? Also are there any other factors. Do let me know ..thanks

Hi there! So to wrap up the year in AP Physics 1, we have to take videos or pictures of physics in everyday life. Two of my situations are: 1. Situation where you have greatest net torque 2. Situation where acceleration changes both speed and direction at same time For the first one, I was...

I'm working on a lab and the task is to determine the half life of an element studying the beta radiation or the gamma radiation (emitted from the daughter). I have all the data and I'm done with the beta part, that was pretty straight forward. I have no clue how to relate the gamma radiation to...

I have four 125 ah batteries powering a 6000 watt inverter. The inverter is supposed to have a no load draw of 2 amps. I have a 12 amp 120volt Ac load. How long should I be able to operate before drawing my batteries to 50%

Are there any complex molecules that are not biomolecules and don't get "involved" with organisms and life building?

Alright so i have exams in a matter of days and stumbled upon this multiple choice question 7. A radioactive source has 1.6×10^20 atoms of a radioactive isotope, with a half-life of 3 days. How many atoms will decay in 12 days? A. 1.0×10^19 B. 1.2×10^20 C. 4.0×10^19 D. 1.5×10^20 So my first...

Hi Guys and Gals, As I was pumping up a flat bike tyre, a weird thought occurred to me about the application of the ideal gas law. Once the tyre essentially finds its physical dimension limitations (i.e. is shaped like a bike tyre and no longer changing shapes) and starts putting in reasonable...

Because I live in Alberta, I've been following quite closely the tragedy from the fire in Fort McMurray. Well over 80,000 people have been evacuated from the city and the Premier of the province has stated that it's likely going to be a long time (not just days) for people to return, and many...

If so, what is the evidence? Sources are appreciated.

If I don't use my lithium polymer batteries for an extended period of time will that damage them? In that case how often should I charge them to prevent a such degradation? Thanks in advance

I believe the first life to appear on Earth appeared in the oceans of Earth. When I ask if life would have appeared on Earth without oxygen, I am asking if life would have appeared in the oceans of Earth or on land without oxygen. Would life have appeared on Earth without oxygen?

What's going to let an engine last longer: 1) Accelerating quickly to just above desired speed and coasting until speed drops 2) Holding engine at a more constant lower rpm to achieve that desired speed I know to some extent 1) is better for fuel when the acceleration isn't too hard but...

We are asked to describe the sun's life in 4 different sequences of the HR-diagram. The second one is in main sequence, third one is in the red giant area, and the last one is in the white dwarf area. The first one is the one I cannot understand. I recreated where the numbers are on a new...

Wikipedia https://en.wikipedia.org/wiki/Europa_(moon)#Subsurface_ocean says that "Scientists' consensus is that a layer of liquid water exists beneath Europa's surface, and that heat from tidal flexing allows the subsurface ocean to remain liquid." There have been speculations that Europa might...

http://gizmodo.com/frozen-tardigrade-brought-back-to-life-after-30-years-1753152359 Sorry if this is the wrong place for this post am only posting to get a few good responses if possible :). Is there any way we could extract the properties in the gnome of the tardigrade and genetically...

I think that many SF books and films focus on big battles, or a great discovery, but care less about, how everyday life could change? In a not so near future, (that is fictional, but meant to be rather hard, realistic) could people have a life similar to ours, with all the recent developments...

I'm 24. I've spent time in university, thinking that I was behind everyone else and I was missing out on having a life. I also spent time out of university and now I know that I wasn't missing anything. I now realize that the most important than I can spend my 20's doing is building a career...

Recently, in a tutorial session, my professor raises this question. Experiments show that humans don't have free will. Decisions are made by us through unconscious activity of our brain. We are just conscious about the decisions our brain make. We are not actually controlling ourselves. I feel...

As we all know radioactive isotopes have different half lives and different decay energies. Is there any tie between how long or short the half life is and the amount of energy of decay? I know that it will be a rather complex problem, especially for alpha decay where the mass of the...

A Proton-M rocket carrying the ExoMars 2016 spacecraft blasts off from the launch pad at the Russian-leased Baikonur cosmodrome. Objectives: to search for possible biosignatures of Martian life, past or present. to characterize the water and geochemical distribution as a function of depth in...

Eye opening (for me) pod cast, "(So-Called) Life". They can do what! Third segment, (?), they can type in a DNA sequence into a machine and it synthesizes a DNA sequence of your choice! http://www.radiolab.org/story/91596-so-called-life/

Dear PF Forum, I would like to know if LIFE in exoplanet is possible. And if it is, how? When I drove my Pastor to my mother funeral, he asked me out of the blue while I was driving my car. "Do you believe there is another earth?" My immediate response would be, in parallel universe where there...

If there are bacteria that can get their energy from gamma rays (thus thriving on nuclear reactors), can multicellular life do it too? If so, wouldn't that broaden the parts of the universe where life could arise?

Many people have claimed that evolution started life. I'd say it did not. Life started evolution. Before there is evolution, there must be life. Am I right?

Some people here will certainly already be familiar with SOLIS (The Panspermia Society) http://www.panspermia-society.com/. From what I can gather, the guy running it wants to plant seeds and microbes on planets hundreds of light years away so that life will exist in space once the Earth is...

Let's assume there is a planet out there with life equally intelligent as humans that is putting in the exact same amount of effort to detect alien life that we are. Their science and technology also developed in line with human technology. Given that we're looking and they're looking, what is...

Spontaneous negative entropy reactions can occur when the internal energy decrease is greater than the negative dS*T. dG=dU-dST is spontaneous if dG is negative. The moon is receiving at least 1E8 J/s from the loss of rotational energy from the Earth's water and air. A lot more rotational...

The great basic question of science: Membrane compartment or non-membrane phase compartment (biophase) is a physical basis for origin of life? Matveev V.V. 2016. Comparison of fundamental physical properties of the model cells (protocells) and the living cells reveals the need in...

It is truly unfair. I have still never been in a relationship. Have no friends, even though I am told I am pretty. Failed my first class last semester due to extensive work. My grandmother gives me grief when things don't go her way in my regard. Like what did I do to deserve this? I am such a...

Novel idea on the origin of life based on a system self organizing to dissipate energy as efficiently as possible: http://www.businessinsider.com/physicist-has-a-groundbreaking-idea-about-why-life-exists-2016-1?amp

Good evening, I'm 17 years old and this is my last year before going to university, I'm really looking forwards to it. Except for one thing : I took don't know what and where I want to study... And it should really be time to find out. What I do know is that I want to study something with...

What would have happened to to the evolutionary process had the Earth's axis of rotation had no tilt? What comes to me first would be a total lack of anything based on the year calendar. There would be no deciduous trees or dormant grasses, certain animal species would have no particular mating...

So just a fun thread/question about the game Half life, and one of the events that happen in the game called a Resonance cascade. In the game, a Resonance Cascade is basically a "quantum event" where the crystal resonates at a certain frequency, causing other particles to resonate, cascading...

is life a matter of constantly evolving chemistry?

im 19 thinking to study either physics or electrical engineering, but what do physics people and engineers do in real life outside of school when they wake up in the morning and go to work? putting aside the supercool stuff you see on tv, what is reality like? and what are the advantages of each...

Sorry if this is in the wrong forum. (If you don't want to read my rant, just skip to the bottom paragraph.) I am currently majoring in chemistry at university, and I am graduating next semester. I like chemistry, unlike most people, but I'm a little different than my fellow undergraduate...

So I'm getting ready to buy some Tritium gun sights that will glow in the dark. The advertisement says Tritium has a half life of 12.3 so the sights will be about half as bright (50%) after 12.3 years. I'm wondering how bright they will be after 6 years and 2 months...will they be one quarter...

Okay, hello there! I'm just beggining with an electricity course, and I saw this formula to claculate the Vrms : " Vrms=Vp/√2"... I'm trying to understand the origen of this formula, I see that I have to divide Vp%1,4142... but how do you explain a division with a decimal number..I...

Currently I am an Undergrad Physics major. I am suppose to start research next semester in order to prepare me for graduate school and get a PhD. While this has been easy for some my current physics class has driven me into the ground and the hardness of it is making me dislike physics...

can a line (thickness only in 1 dimension ) be observed in real life ? since ,at micro level , even atoms have thickness, is it even possible to really construct a line or point or plane in reality?

Hello PhysicsForums Readers, I need some advice concerning studying habits and techniques. I just started engineering undergrad in Canada, and while I feel I'm adequately intelligent to succeed here, my studying habits might possibly kill me. I feel like I love math and physics and the topics...

From this link https://en.wikipedia.org/wiki/Fine-tuned_Universe It seems that it is, what is the probability for such a universe?, has it gone through many iterations to come to be able to support life,? or was it a that life can be able to flourish or adapt to manifold of universes , for...

If there was microbial life on Mars in the distant past, would there be any way to conclusively confirm it? Or would any such attempt be reduced to speculation, like the Martian meteor which "possibly" contained evidence?

Since the time of Darwin, biologists have looked at the history of life as a tree showing how the common ancestor of all life gave rise to all extant species. However, as we have learned more about biology, we've found that organisms do not inherit genetic information from only their direct...

Hello, I were looking for smartest forum on internet and found this forum. I guess, will get any help from here, because this quality of life isn't even worth living. Living in third world country - Lithuania and here air is very polluted. Mostly it's from solid fuel firing winter time. Of...

Is it really possible to send people to Mars and not risk microbial contamination of any life there ? If the recent discovery of liquid water raises the possibility of life, should any human missions be delayed until this is understood better? ISTM if there are any living Microorganisms on the...

Does discovery of flowing water on Mars means that life even in microscopic form is possible ?

Hi, I'm Joel and I am pretty much finished school in Australia and have to make a decision about university in the near future. I love science (especially Physics) and mathematics at school so am certain that I will go into Science or Engineering but I am not quite sure what type. Whatever I do...

Are we alone AND what are the ways we can search alien life?