Life Definition and 1000 Threads

Scientists are looking for Earth like planets/bodies to find life on other planets/bodies, somewhere that is warm enough that liquid water can exist, and somewhere with basic organic molecules. Here's where I have a concern, in the 4 billion years of Earth's life, to our knowledge life had only...

Hello, Are the 20 amino acids that are usually referenced when building genetically coded proteins in all of life, and no other amino acids or are these only in humans and animals? I found the sentence below on this website and I wasn't sure what to make of it, is it true that there are...

Jack Smith, professor emeritus of physics at SUNY Stony Brook passed away Sunday. His colleague George Sterman writes " Jack Smith joined the Institute for Theoretical Physics at Stony Brook as research associate in the Institute’s second year, 1967, and he subsequently joined the faculty of...

https://www.nature.com/articles/s41598-017-05796-x Abstract: Milnesium is a tardigrade. They can resist severe dessication, extreme heat, and extreme cold.

Can anyone please explain me some uses of maxwell's on my REAL life? REAL life = weapons, propulsion, tech, radio frequency and microwaves,nuclear physics(maybe); no REAL life = monopoles, origin of the universe, space bull, particle physics( muons,pions etc.); PS. I am 14 years old so don't...

Just curious , have there been any such circumstances in the history of this universe (i'm thinking close or near the big bang moment of hot dense plasma) or are there possible such a scenario even theoretically where the half lives of isotopes and elements change? In other words for example...

I think it is not possible, my friend seems to think if you press hard enough on the atmosphere it will become dense enough to jump on.

Hey, My question isn't exactly a problem,it's just a doubt which occurred in my mind,while studying current electricity.The potential difference across the emf of an ideal battery is considered to be constant,whereas if the battery has an internal resistance (the case for all real life...

What is the importance of methyl isocyanate to life and if this paper is correct how bigger discovery is it? < Mentor Note -- link to text added >[/color] https://www.eso.org/public/usa/news/eso1718/ Niels Ligterink is delighted with the supporting laboratory results: "Besides detecting...

Does anyone know What the life permitting ranges for the constants usually mentioned in the Fine Tuning argument are? i.e. h, G, e, rate of expansion, amount of dark matter ect... My thinking is that if they are just kind of randomly placed inside their respective ranges then that would indicate...

I am not sure if this is entirely correct, but first I am going to say that life on Earth mostly thrives in the visible range of the electromagnetic spectrum, and perhaps some infrared and ultraviolet (for some creatures), because it is the frequency range that they were the most exposed to...

Today, my teacher asked us what is the real life utility of the dot product and cross product of vectors. Many of us said that one gives a scalar product, and one gives a vector product. But he said that, that was not the real life utility of the dot and cross product. He asked us, "Students...

Hello, My name is muaadh. I had an experiment in Physic about resonance in one end closed pipe. Our homework is to find applications in real life about this experiment. This photo of our experiment.

oops this is a pre calc question $\tiny{hcc.18}$ the half life of silicon-32 is $710$ years. If $10g$ are present now how much will be present in 600 yrs? to find out $k$ using $$A=A_0 e^{kt}$$ $$\frac{1}{2}=e^{k \cdot 710}$$ $$\ln\left[\frac{1}{2}\right]=k\cdot710$$...

I recently read ' Life on the Edge" by Jim Al-Khalili and Johnjoe McFadden. It was very readable and it got me quite convinced about the whole idea. Al-Khalili is a very presentable broadcaster / writer and offers an attractive case. But it was written some while ago and Google hasn't much to...

Would it be possible to craft a carbon based life form throw dna manipulation and selective breeding that could live in the cold vacuum of space?? Also if I posted the thread in the wrong place I'm sorry I didn't know where else to place it. Once again thank you to anyone that will tack the time...

Hello all, I am a little confused at this stage of my life about what to do. To give a background, I have a PhD in EE with specialization in wireless communication from a Canadian university. Soon after I finished my PhD I was hired as a postdoc for almost 18 months. Since I finished my first...

I am aware of some biological experiments on Martian soil that were conducted during the early days of space exploration (Viking). These tests were supposedly inconclusive, and we were not really looking in the most likely place anyways. Besides that, I have heard only about exploration...

I know, this question probably have asked many times, but I unable to post in that closed threads, so... We have a Planet, (let's say of size of the Earth, and that have a population of the Intelligent Creature - IC, on level of evolution and progress something near a mankind current level, so...

On Monday, I was given back my last biology test. Upon looking at one of the questions that I got wrong, I was unable to understand what I did wrong. I attempted to argue my case to my teacher, but she did not think about my arguments before denying them. The question is as follows: One week...

Homework Statement A radioactive source emits alpha particles at a constant rate 3.5x10^6 s^-1. The particles are collected for a period of 40 days. BY reference to the half life of the source, suggest why it may be assumed that rate of emission of alpha particles remain constant?The Attempt at...

Homework Statement A source having a half life of 5.27 years is calibrated and found to have an activity of 3.5*10^5 Bq.The uncertainty in the calibration is +- 2% Calculate the length of time in days after the calibration has been made for the stated activity to have a maximum possible error...

Hello, Are there elements that are never found in life forms? Or can some find themselves in life, but perhaps very unlikely?

Since the planet is only 4.55 BY old, that might be considered a fast start. Some people have found some rocks (3.7 BYA) in Greenland with what they think are indications of life (short article, a bit longer article). The indicators are primarily microscopic hematite tubes (some say, similar...

I've been stuck on this physics problem for several years now. I would be very grateful if someone could explain how to solve this problem. The farthest a human could travel from Earth in one lifetime theoretically is limited only by the acceleration a human can withstand, and the length of...

Hello everyone, Last night I was reading about gravity and I come across one debate. I tried to search about it but got confused. I hope some one can help me. The question is: Why is it so hard to realistically simulate the collisions of particles, gravity all the forces that go on around...

Hello, my name is Andraž, I am from Slovenia(east neighbor of Italy, and southern neighbor of Austria for those of you who don't know) and I am very determined to be a physicist. I am 18 years old and as a student of the fourth year of high school, I am about to apply for the university...

Assume that you are commissioned to select three solar system bodies (planets or moons) to deposit a colony of bacteria or microbes of your choice outside (i.e. either on the surface or underground, but not in any man-made enclosure). No resources from Earth (such as food, water, organic...

Humans, other animals, plants, fungi and almost all other forms of complex, multi-cellular life are known as eukaryotes. How eukaryotes evolved from simpler prokaryotic organisms is a major question in evolutionary biology. The current view is that eukaryotes evolved from the fusion between a...

Hello everyone, I want to give some brief background info about myself before asking; I am a junior/senior undergraduate living in Southern California studying mechanical engineering, and leaning towards the thermo/fluids side of mechanical engineering. However, when it comes to "my true...

Its been proposed that chemical life might exist in the atmospheres of brown draft stars.

Is there equivalence equation between cross section & half life? For beta decay, we usually use half life to describe how fast or slow the decay undergo. For nuclear reaction, we use cross section to describe the possibility of reaction. In a sense, they reflect the same root physics spirit. Is...

My book says that a free neutron, unlike a free proton is unstable. It decays into proton, electron and a antineutrino, and has half life of about 1000s. I do not understand how a single particle can have something called half life. I am finding difficulty to think of a proton being reduced...

Pro-Moscow figure Igor Dodon claims Moldova presidency (BBC News) When I saw this, I thought immediately of Rimsky-Korsakov's 1907 opera The Golden Cockerel (Le coq d'or) in which Tsar Dodon is pecked to death by the eponymous cockerel. https://en.wikipedia.org/wiki/The_Golden_Cockerel

Is H2O a biomolecule?

[Question] So I was thinking about Physics for some time and for the sake of curiosity I've came with this problem: Let's say we have a liquid flowing into a system with infinite space. The flow is constant ( F ) The liquid decays over time with a half life ( λ ) We're looking for the Total...

Idk if this is the forum to turn to or even if its the correct forum thread thingy. In that case i apologize in advance. I got no where else to turn to, and I really have hoped to gain some answers somewhere. I have a lot of problems with physics. I'm starting to only now get A's in most of my...

I always wondered why they say water and photons created the first microbes which later evolved and produced oxygen which filled our oceans and atmosphere. So how could have water existed without oxygen? I tried to look up and came up with different explanations, but it doesn't make sense.

Okay, first in a possible series of thought experiments*. Humans fall prey to Captain Tripps (the SuperFlu for you East Coast gangstas) and is wiped out. This leaves room for another species to take over as the dominant critters on the planet. What challenges do they face? Raccoon are a...

Homework Statement Specific Activity of a sample of rubidium chloride is 478 Bq per gram knowing that activity is coming from Rb-87, calculate the half life of radioisotope - Molar mass of the RbCl natural is 120.9256 gram - Isotope composition of natural Rb is 72.15% and 27.85% respectively...

If I shoot some free electrons detached from any atom in space from a space station what happens to the electrons? I know around the atom's nucleus electron creates cloud like movement having various energy levels. But what type of movement , cloud and energy the electron holds in absence of any...

Just like books by "Jules verne" changed Dr emmit brown's life in the movie " Back to the future" and then he decided that he should dedicate his life for the love of science. Book that motivated you for science. I am waiting to hear your story so get set go.

Homework Statement Hi, I have a double integral with square root of 1-x^3 that I can't solve. Here is the integral and attempt at the solution. I get stuck! Homework Equations I am in Calc II. Mostly we used integration by parts, or substituting t=something for most "difficult" integrals...

[Sorry for the vague title, had a limit.] I have a question given in my Astronomy class: Below is a list of possible ways in which the universe could have been different. Some of these changes would make life as we know it impossible in our universe. Tick the boxes next to all the changes that...

I am using a 30kW air heater which is using resistance wire. I am not exactly sure what type of wire it is and hope this will not be an issue in answering this question. The heater is rated at 380V and 45amps(max)...my supply is 415VAC (+ 6% and - 10%) and 45amps. Any idea if this extra...

EXPLORING THE POSSIBILITY OF PERFORMING COMPUTATIONS WITH PLAYING CARDS I was listening to an interview with John Conway yesterday and the conversation turned to his "Game of Life". Conway mentioned that Life can be configured in such a way that it can perform arbitrary computations. This got...

Is life common in the universe ? or do we live in a special space and time. https://www.sciencedaily.com/releases/2016/07/160711155538.htm

Hello guys. can you tell me what is a Quality Life? I have been searching this for the past few weeks but all the information i get is about "Quality of Life" and it is not the data i wanted to get :(

So I've been struggling with this decision for the past 6-8 months. I go to a community college and I will be completing an associates degree in mechanical engineering in about a year (only 6 classes left). I think engineering is awesome, and so far I love the classes I've taken; Statics has...

well if seen from top approach, "dejavu" is just a myth, but if it is observed practically, it happens with me everyday. I think that I am always respecting my actions. I think that there is 30 hours in my day. I think that I am a freak but if it happens a dozen of times, it is no coincidence...