Can anyone tell me how many planets have life on them in the universe--approximately ?

Answer 1

23

Answer 2

touhidul's site is bogus.

What is your question asking for? Estimates? Guesses? Opinions?

What do you mean 'approximately'?

Earth has advanced life forms.
Meteorites from Mars show evidence of microbial life.

These are the only life detected in the universe so far.

If you want guesses, Venus may have microbial life forms in it's atmosphere. And there may be life forms on some moons of the gas giants. There may be life forms on planets circling other stars in our galaxy and among star systems in other galaxies but such have not been detected. We are just beginning to find planets circling other stars.

No life has yet been detected outside of Earth and Martian meteorites.

It is currently not possible with present technology to detect life forms anywhere outside of our Solar System. And this may not ever be possible without actually travelling to the star system. Estimates may be deduced from the fact that the chemicals and gasses present in our Solar System seem to be present throughout the Universe. But these would be educated guesses and not proven fact.

Answer 3

The only proven life to exist is here on Earth. No other life anywhere else has been detected.

That being said, a slightly-educated guess I read several months ago was:

planets orbit one star in 10.
Rocky worlds exist about one star in 10,000.
one star in a million will have a rocky planet in the "comfort zone" - an area where water exists in a liquid state.
Conditions for life to exist will be present on one in 10 of these worlds. So, in our galaxy alone: about 40,000.

But - all those were guesses. I would think the number to be higher, others think it should be lower.

Answer 4

Only one that we know of - this one. There is no evidence whatsoever that either suggests of precludes the idea of life elsewhere.

There was a famous equation that was designed to demonstrate how many other life forms there MAY be, and it was in the millions. But that is just conjecture.

Personally, I believe life exists all over the universe, but far too distant to make it likely that we'll ever have contact with them.

Answer 5

It is known that there are an infinite number of worlds, simply because there is an infinite amount of space for them to be in. However, not every one of them is inhabited. Therefore, there must be a finite number of inhabited worlds. Any finite number divided by infinity is as near to nothing as makes no odds, so the average population of all the planets in the Universe can be said to be zero. From this it follows that the population of the whole Universe is also zero, and that any people you may meet from time to time are merely the products of a deranged imagination.

Answer 6

No one can tell you that.We don't know.Simple and sweet.Could be trillions,could be one.The "drake equation" gives you one way to speculate it.But the drake equation is almost entirely guesswork.In other words,you have to insert the variable in,so it really doesn't prove anything.It's a good thought experiment though.It is certainly POSSIBLE for there to be billions of planets with life.We simply just do not know.So far,we have not detected intelligence or life elsewhere.The best we can do at this point is to look for the water,as life AS WE KNOW IT,depends on it.Extra-solar planets are difficult to detect,Earth sized ones harder still.We have detected quite a few,most Jupiter sized,too big and cold for life as we know it.We have detected one we think may have water,but we have not verified life of any sort outside of Earth to this date

Answer 7

We're sure about Earth, and indications are Mars may also have some primitive life. (stuff you might see in a microscope).

But with an infinite number of stars, it's likely there are billions of planets out there, and odds are a bunch of them have life in some form, but odds are we'll never see or communicate with them because they're so far away.

Answer 8

If you mean intelligent life: 1 - Earth (debated)
I believe that i heard that if a planet has water sources on, there may be some small living algae and the such. But it looks like just Earth at the moment.

Answer 9

At this time, Earth is the only planet we know of that has life on it.

Answer 10

It is generally accepted that, to the best of our knowledge, there is approximately one, however the jury is still out on whether that is "intelligent" life.