Life Definition and 1000 Threads

From, http://www.ibtimes.com/researchers-release-first-draft-open-source-tree-life-23-million-species-organisms-2105757 In a project funded by the University of Michigan and the U.S. National Science Foundation, researchers from 11 different institutions have finished creating the first draft...

SETI reborn—the new search for intelligent life A new influx of money has saved the Search for Extraterrestrial Intelligence (SETI) from collapse, but what does the future hold for our quest to discover intelligent life in the Universe? Continue reading...

Oxygen is not definitive evidence of life on habitable extrasolar planets The Earth's atmosphere contains oxygen because plants continuously produce it through photosynthesis. This abundant supply of oxygen allows life forms like animals to flourish. Therefore, oxygen had been thought to be an...

This paper: http://arxiv.org/abs/1509.02832, The Age Distribution of Potential Intelligent Life in the Milky Way, estimates the age distribution of intelligent civilazations in the Milky Way. Unsurprisingly we rank somewhat below the advancement level of termites compared to your typical ET. It...

So far i imagine things as following : instead of spinning up the whole rock, they have a spin station nearby, and build really big structures in microgravity, hangars for ships, factories etc. Due to lack of biosphere, it is common to reprocess dead bodies to food, fergitilizer. Questions ...

This is a question many students ask their teachers from the beginning of time; however, I feel like a solid answer has never been offered. We learn all these rules, concepts, and tests, but we have no idea of how they relate to the real world. I think if we could -not just answer, but...

Dear PF Forum, I have questions about carbon based life and molecule back bone. Is it true that all life on Earth are carbon based? If it is true, why? Is it because carbon is halfway in periodic table? 4 valence? What about Silicon, Tin and Germanium? They have 4 valence, why life is not based...

I hear it's 60hrs + What's a day like for you? From waking up until going to bed. What's it like year round? Do you get any vacation?

So I have been looking around throughout the physics forum and other sources and still can't seem to find a good general explanation of how Life, and energy are related. First let me propose some definitions to help further our discussion and clarify what i mean. Life, in the way it concerns us...

I'd like to understand if non-atomic life forms are possible. For example, purely electrical ones. I'm not talking about those electron eating bacterias, they are still made out of atoms. Is there a possibility to form a stable structure out of electrons, or photons? Not necessarily in a vacuum...

Batteries and rate of charge? I have an IPad. It 'seems' that when he battery if fully or mostly charged it lasts proportionately longer than when less charged. For instance, all things equal, the battery takes a shorter time to drain from 30% charged to 10% than it does from 90% to 70%...

I am a mechanical engineering major and I try to focus all my entire life in the direction of getting the degree and finding a work where I can do what I truly like. In general I try to do hobbies very related to "intelligence" growth, for example: I'm learning Portuguese, playing the guitar...

Looking for research on the destruction of biological evidence due to the subduction and destruction inherent to plate tectonic activity. One, are there any places on Earth that have not been affected by tectonic activity? And two, what is our chronological limitation in looking back at...

"Tritium is the basic fuel of hydrogen bombs and is used to increase the power for fission bombs . . . In a basic atom bomb (or reactor), plutonium atoms are split, or fissioned, to release energy, but the fission can be promoted with a small amount of tritium because it has two extra...

Mankind just lost it's most important battle in history, what would Earth look like in 1000 years? What would change?

I had a thought and was wondering if it's viable to detecting whether or not life exists in Titan's hydrocarbon seas, whether we get direct evidence or not. Titan lakes are hydrocarbons, which likes to create twisted polymer chains. Nature (lightning, cosmic rays...) should produce polymers...

like do you work or are you a student i currently work in a supermarket.

1. The Lead is the final decay product of uranium-238 (half life = 4.7 billion years), so often the uranium is embedded in lead. The decay of 1.00 g of uranium to thorium converts 6.83x10-8 kg of mass to energy. Assuming the uranium absorbs none of the heat, what would be the...

Homework Statement If a radioactive isotope ends with 55.5 g, and has a half-life of 2.5 days, how much was there 8.3 days ago? Homework Equations mf=mi(1/2^t/h) The Attempt at a Solution the answer i got was 554 g, is it correct?

I like academic work, and I am fairly good at it, but not good enough to get on the tenure track. Postdoctoral salary for me is sufficient to comfortably support a family of four, and we don't mind moving from time to time, since my wife is not working. Is expecting to work as a postdoc for the...

What are the geometric shapes that you can find in daily life?

Homework Statement Decay of Carbon-11 from given data of count rate at time 0 to count rate at time 14 minutes in 2 minute intervals. Homework Equations I feel like I've gone wrong here because the answer I get of 19.6 minutes is actually negative if I go back and do the last equation again. I...

Ok. I'm now studying economics and applied math, and I'm currently wanting to know what book or online resource could help me in learning how to model real life situations into functions. Most math and econ textbooks are garbage at this. I'll be more specific. In my study of Microeconomics...

Dear All, I would like to calculate fatigue life for the following: A SS430F metal component is repeatedly hitting at 0.10mm SS304 sheet with 1 Kg load from 0.20 mm distance. Assume, Area of hitting: 5.5mm X 16mm = 88 Sq.mm. Hitting load = 1 Kg Tensile strength of 0.10mm SS304 sheet is 515...

Hello everyone, I am a 4th year graduate student in nuclear engineering at a top university. I am about a year out from graduation and am beginning to think about what to do when I grow up. I have seen many friends (and read plenty of threads) about PhD's not being able to find a job after...

Greetings, My wife and I are currently in the process of writing our next book, the main character of which will be an astronomer. So far my research has given me plenty of resources on astronomy itself but very little on the actual astronomer. I would love to get some insight on what the day...

ZapperZ submitted a new PF Insights post The Life of a Physics Major Continue reading the Original PF Insights Post.

Biologists split life into two broad categories: prokaryotes and eukaryotes. Prokaryotes are relatively simple single-celled organisms and are split into two groups (bacteria and archaea). Eukaryotes, on the other hand, are much more complex cells containing specialized compartments such as...

I know this is the Physics Forums and not the Biology Forums, but I feel that this question is more on the physics side of the spectrum than the biology side. What potential effects could the existence of a hypothetical, unusually warped spacetime, where there were naturally-occurring curves...

People queuing to pick up photos at an event. They have a bar-coded docket. By scanning the docket, printing is initiated on one of eight printers. Each printer takes 40 seconds to print a photo - the software chooses the least heavily loaded print queue - or uses a round-robin approach if print...

There is only one planet (Earth)have life in the universe.But this is invented by human; the son of Earth! Is any other life live away from the solarsystem? I don’t know!…..oureyes&ears reach not so much. We are the most advanced biota among others in the earth. And we take oxygen as the life...

Galilean creation is one of a number of proposed alternatives to inflationary cosmology. This paper; http://arxiv.org/abs/1504.05710, Galilean Creation of the Inflationary Universe, takes the idea a step further by showing how it can transit smoothly to the single field inflationary model...

Ok so.. I have always been interested in natural sciences so I'll probably keep on browsing the forum.. but I'm off age when I needed to choose what to study (21) and I enrolled in physics. I can still change that.. Last year I studied Chemistry but Physics was one of the few classes I passed...

Homework Statement 137Cs has a half life t1/2 = 30.07 years. After 50 years, what fraction of 137Cs will remain? Homework Equations maybe... dN/dλ = λN λ = ln2/t1/2, half life in seconds N = Total mass /(137(1.67x10-17kg)) The Attempt at a Solution i thought maybe i needed to figure out a...

I'm getting some popcorn! http://www.huffingtonpost.com/2015/04/08/nasa-alien-life_n_7023134.html

Homework Statement The number of radioactive nuclei in a particular sample decreases over a period of 26 days to one-fifteenth of the original number. What is the half-life of the radioactive material, in days? Homework Equations R=DN/Dt=(lambda)(N)=(N)(ln2/T1/2) The Attempt at a Solution...

Hi there, Just wondering if anyone here can help me with a real life math problem I have on my hands right now! I am going to borrow \$48,000 from a bank as an unsecured personal loan for a 3 year period. I have to make minimum monthly payments of 1% of the outstanding loan balance at the end...

Chemists claim to have solved riddle of how life began on Earth http://phys.org/news/2015-03-chemists-riddle-life-began-earth.html Here is the journal article http://www.nature.com/nchem/journal/vaop/ncurrent/full/nchem.2202.html

Area under decay curve exp(-0.6969t/h) where t is the time (with t=0 initially) and h is a constant "half life" is analytically integrable, but what if the half life is increasing with time? I. e. if h(t) = H + at. (Note exp(-0.6969) is not exactly 0.5 but close and easy to remember.) This...

i want a real life application of calculus so that I can understand it

Homework Statement For the development of life time is needed. The period during which the star remains at the main sequence depends primarily upon its mass. Type stars, our sun "yellow dwarf" remain on the main sequence about 10 billion years. Weight is often measured in multiples of the mass...

hi, everyone I didn't know where to post this thread so I posted it here. I have read many articles about EM wave to find what I'm searching for and nothing still. I have seen many pictures, animations and videos about EM wave, and about oscillating charge, but still nothing. What I am really...

Looking for any life expectancy data for water soluble flux going low Z. How long it takes for conductive material to migrate and cause low impedance bridges at any humidity or temperature.

Im doing a project on school. I want to re-use energy. I know that it will not run forever (but i hope it runs very long). So i wanted to ask if the image below is right and i could use it at school. If it shouldn´t work please say what i can make better. Thanks for your Help! Here is my image...

On the other hand, what if we only have two atoms of an element with a half life of ten years. Then after then years, only one atom of that original element remains. What happens next? Is the lone surviving atom immutable?

Our definition of life keeps changing as we discover living things in places we did not think life could exist. My question is how would we define life if this trend continues? As of now we believe all living things need liquid water. But we may find organism living in any kind of liquid...

Homework Statement A sample containing carbon-14 has 16000 decays per minute. If the half life of carbon-14 is 5730 years. Aproximately how many decays per minute would be occurring after another 50 000 years. Answer: approximately 40 decays per minute. Homework Equations N= No x e^-λt...

I was reading an article the other day discussing the possibility of ever finding intelligent life elsewhere in the universe, and I was wondering about what conditions really do matter for intelligent, technologically advanced life. By technologically advanced, I mean basic Stone Age technology...

Here is something that I've been working on for the past two weeks, it's in its early stages, although I've done a lot of work. Fair warning: this is really CPU intensive and will crush anything short of an i7. Do not open it with a handheld! http://cilium.codebuffalo.com/ Please check it out...

When my friend asked me about CP violation, I told them about some elementary particles physics. But it seemed they do not have background about this. So is there any daily practical activity that can explain CP violation? Thanks.