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xenobiology

Debate and discussion of any biological questions not pertaining to a particular topic.

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Postby Khaiy » Wed Mar 01, 2006 5:16 am

Ken Ramos wrote:Question: If you were in a vehicle traveling at light speed and you turned on a spot light to shine ahead of that vehicle. Would it produce a beam of light or not? If so how fast would the beam be traveling? The answer could be in the infamous formula E=mc^2 :D


The answer is short answer is no, because as you approach the speed of light more and more of your energy is converted to mass (as the relativity equation shows). So you couldn't actually reach the speed of light because of the mass you already had. If you were moving close to the speed of light, the light would still be travelling faster than you (3*10^8 ), and so it would project ahead of you. But if somehow you were already travelling at the speed of light, turning a searchlight on could only project light at the same speed at which you were already travelling, so the light could never leave its point of origin to make a beam.
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Postby damien james » Thu Mar 02, 2006 6:11 am

I take ET life seriously alex. I am finishing school this year and wish they had a masters in astrobiology somewhere so that I could go there. But the best I can find are certificates. I think microbiology would probably be the specialty of choice for someone in this field, so I am lucky there. What is your degree in and have you thought about pursuing a career in astrobiology :)
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Postby alextemplet » Fri Mar 03, 2006 1:15 am

Ha, degree. If only I could be so lucky. I had to quit college when my family kicked me out the house and now I'm working two jobs to pay the bills and trying to save up the money to go back. But when I do I'd rather major in evolutionary biology than xenobiology.
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Postby damien james » Fri Mar 03, 2006 7:18 am

That is good that you are going back to school. You seem smart and I thought you already have degree. I hope it works out. I never thought about evolutionary biology, but after reading the origin thread and some others, it seem very interesting. But I will stick to my germs :)
The hand of God may well be all around us, but it is not, nor can it be, the task of science to dust for fingerprints.
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Postby Linn » Fri Mar 10, 2006 3:34 am

"How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in life you will have been all of these".

~ George washington Carver
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Postby sebast18 » Fri Mar 17, 2006 6:53 pm

Here's my opinion. I'm a future biologist and I thought about this many times... There is proof that most basic organic molecule can be created in the athmosphear or underwater. It is statistically possible that simple life like system auto-assemble in natural conditions, it happened here after all. Considering the unbeliveable size of the universe, it is impossible that what happened on Earth did'nt happened somewhere else. There's got to be earth-like planets in millions of solar systems. There is also the possibility that life may exist in other forms than the one we know. There is actually interresting theories about sillicium based organisms instead of the carbon based organisms we know. If you believe that life exists on other planets, you've got to be very egoist. Earth is not unique, it's special, but not unique. Now about the question of aliens visiting our planet... Space is not like in the movies, you cannot jump from a planet to another in a second. Other solar systems are very far, the closest are at a couple of light years... A light year is the distance light travels in a year... According to actual knowledge, traveling at the speed of light is impossible for us. Most people just don't realise how fast light goes, just under 300 km/second! There is also the fact that only photons and electromagnetic waves can reach such speeds. The best we could ever hope is about 1/3 speed of light wich is very generous. Unless your aliens are so good that they can change the laws of physics, it is improbable that they could come here. If they are quite far, the echoes of human activities would come to their planet with a delay equal to the number of light years between our worlds. Then they would have to come here and travel unbelievable distances to kidnap our cows, study the human rectum and do some business with the american governement. :P To detect our activities they would have to scan all the frequencies of the electromagnetic waves that hit their planet. Not sure we're event doing half a percent of that on earth.
So... i'm pretty sure that extraterrestrial life exists but i don't belive that they can visit us.
I want to believe in it, but it seems too unprobable to me. Not impossible.
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Postby sebast18 » Fri Mar 17, 2006 7:21 pm

Ken ramos said:<< If our sun were to burn out instantly, it would be or take 8.6 seconds before we would know it or realize it. A lot of good that is going to do us. >>

Ken, in fact the sun is 8,32 light minutes from earth.

You also said: <<most objects burn up on entry into our atmosphere and that even those that may make it through somewhat intact would be so hot that any life as we know it could not survive on them. >>

Nope, life can survive athmospheric entry. Some bacterias can survive empty space, thousands of years without food and inbelievable heat. It performs such things by turning into spores. It remains like that until it is activated bya stimulus such as water. If you don't believe it just read "Sciences et vie', I read this in an aricle in 2006. You will also be surprised to know that man already contaminated many planets with earth life spores. A study revealed that decontaminations that are performed on space probes are not sufficient to kill many types of bacteria that can survive a space travel. :p It is very improbable that these spores turn back to bacterias due to the harsh conditions on the other solar system planets. :)
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Postby February Beetle » Fri Mar 17, 2006 7:34 pm

I thought that when the sun runs out of Hydrogen to turn into heavy Helium by fusion it will go through a huge change and start changing heavy Helium into another molecule and get huge and engulf the 4 closest plants to it? I didn't think it would burn out before it engulfed Earth.

I was also going to say it is easier to believe humans or any other life form can travel at the speed of life if you look back however many years you want to, 1000 or 2000 or even a few hundred. We look back on humans at that time and talk about how primitive their knowledge was, like ours is so high-tech and superior, but ours will seem probably just that silly when someone looks back at our civilizations in the next 1000 years. Hard to image still, I guess.
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Postby mith » Fri Mar 17, 2006 10:23 pm

becomes a red giant before engulfing earth
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr
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Postby February Beetle » Sat Mar 18, 2006 3:49 am

That's the word! Thanks.
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Postby sebast18 » Mon Mar 20, 2006 7:39 pm

February Beetle
The laws of physics are the same for aliens.
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Postby Linn » Mon Mar 20, 2006 11:40 pm

Nope, life can survive athmospheric entry. Some bacterias can survive empty space, thousands of years without food and inbelievable heat. It performs


yup that is what I have read in many scientific journals and have seen on national geographic and the science channel.

Also, astronomers are searching for a planet that is
earth like in size
with a sun in approximation like our earth,
where the likelihood of life is much greater.

I just saw on a show the other day that they
think they have found one.
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