Is there other life outside of planet earth?

Answer 1

There are 200 billion suns in our galaxy and as many galaxies beyond. It's unthinkable that there isn't. They're just so far away it would take hundreds of years for us to say hello.

Here's Drakes equation, which formulates the mathematical probabilities:

The Drake Equation was developed by Frank Drake in 1961 as a way to focus on the factors which determine how many intelligent, communicating civilizations there are in our galaxy. The Drake Equation is:

N = N* fp ne fl fi fc fL
The equation can really be looked at as a number of questions:

N* represents the number of stars in the Milky Way Galaxy

Question: How many stars are in the Milky Way Galaxy?
Answer: Current estimates are 100 billion.
fp is the fraction of stars that have planets around them

Question: What percentage of stars have planetary systems?

Answer: Current estimates range from 20% to 50%.
ne is the number of planets per star that are capable of sustaining life

Question: For each star that does have a planetary system, how many planets are capable of sustaining life?

Answer: Current estimates range from 1 to 5.
fl is the fraction of planets in ne where life evolves

Question: On what percentage of the planets that are capable of sustaining life does life actually evolve?

Answer: Current estimates range from 100% (where life can evolve it will) down to close to 0%.
fi is the fraction of fl where intelligent life evolves

Question: On the planets where life does evolve, what percentage evolves intelligent life?

Answer: Estimates range from 100% (intelligence is such a survival advantage that it will certainly evolve) down to near 0%.

fc is the fraction of fi that communicate

Question: What percentage of intelligent races have the means and the desire to communicate?

Answer: 10% to 20%

fL is fraction of the planet's life during which the communicating civilizations live

Question: For each civilization that does communicate, for what fraction of the planet's life does the civilization survive?

Answer: This is the toughest of the questions. If we take Earth as an example, the expected lifetime of our Sun and the Earth is roughly 10 billion years. So far we've been communicating with radio waves for less than 100 years. How long will our civilization survive? Will we destroy ourselves in a few years like some predict or will we overcome our problems and survive for millennia? If we were destroyed tomorrow the answer to this question would be 1/100,000,000th. If we survive for 10,000 years the answer will be 1/1,000,000th.

When all of these variables are multiplied together when come up with:

N, the number of communicating civilizations in the galaxy.

Answer 2

Life outside of planet Earth? Yes but maybe not intelligent life.

You only have to tend a garden for a few weeks to realise that life will occur just about anywhere possible and sometimes in seemingly impossible conditions.

The miracle is that we are made out of the raw materials of the universe (star dust) and yet we look out there and ask these questions.

If we are made of star dust we ARE part of the galaxy and yet we have become self aware. We are the thinking mind of the universe. Our Galaxy has become self aware.

That can't happen too many times - unless there is a bigger plan.

Answer 3

Everybody here seams to be thinking that Extraterrestrial life evolutions and Technology goes the same way like Humans.

You are wrong with that.

Alien Technology is completely different from human technology.

They do use other Materials and they think different.

Alien Physics, Biology, chemistry and mathematics are working completely different.

Because they grow up in a different environment with different gravity and Atmosphere.

Humans think that intelligent Evolution like on earth has to develop everywhere the same in the Universe.

You don't know how far you are away from the truth and this is why you could not see an extraterrestrial life even if it was in front of your eyes.

Answer 4

Lets take life like our own based on the element carbon. Well either there is or there is not. Which ever answer you take to be true, it is a truly mind blowing answer. Remember however, people like you and me are unique to the earth and to this point in time. It is a pure fluke that we are here now in the form we exhibit.

If there is life out there why is the universe so quiet?

If it made contact it could also be more terrifying than anything in your scariest nightmares.

Remember its a very big and very old universe.........

Answer 5

The reality is that there is no such thing as "Non Life"...the entire universe is one living creature. The signature of lifewhich is the spiral is in everything from the simplest plants and one celled animals, to the shape of galaxys...The only reason you can't see it is because you are looking in the wrong places for it . If we looked at the earth from orbit, it would appear to be a living creature, wet, with skin, it would change colors and temperatures automatically...it would exhibit intelligence. If you looked closer at the surface, you would say...Ah! but these rocks are not alive,?....BUT...
Would you also say that a human or plant is not alive because it contained minerals which seemed inert? Everything depends on your point of view...there are worlds within worlds within worlds...

Answer 6

We exist. Over the centuries, your planet was a curious place to visit once or twice and was not considered very interesting . Sure, your wars showed us how undeveloped you are as a race and your infantile,(in cosmic terms) dependence on god concepts does not bode well for you. We are now showing an interest in you because it is not often that we get to observe a species commit suicide. You are so close to maturing as a sentient species and it will be a shame to see you kill yourselves. There are just not enough of you becoming rational enough to force the issue. You let the least among you determine your fate, so be it.

Answer 7

well firstly the comment about aliens, an alien in a dictinary is defined as a living thing not from within the earths atmosphere. so if there is something out thereits definately an alien, secondly an alien might not be little green men like in hollywood but it might be fish, insects or even trees. secondly all the great scientists have said it is mathematicaly impossible for their not to be life out there, if you consider the universe as infinite then it mathematicaly impossible if we are alone. einstien belived in it galileo believed it newton believed it and all the top scientist believe it and i know it for a fact there is life out there, the real questionyou should be asking is when are we first gna meet it.

Answer 8

In one aspect yes.
We have astronauts living outside of Earth as we speak.

On the other hand no.
It has not yet been proven that any other human or alien life forms exist outside Earth.

Answer 9

Earthling - We are monitoring signals from earth and found yours.
Be prepared to be transported to our ship where we will show you what you want to know.

To do so you have to stand in the middle of Trafalgar Square in London at 3pm today, naked with a red rose in your mouth and carrying a copy of the News of The World.

We will be dressed like Policemen and will take you to the mother ship. Make sure that you confirm this story to us in order that we know we have the right person.

See you at 3pm!

Zorg.

Answer 10

I think it is naive to believe that this whole big planetary bowl of soup is devoid of any life beyond what's simmering on Planet earth. Hopefully those life forms have evolved beyond war as a means of communication