How many planets are known NOT to have living forms

[LiberalFighter]

Living forms identified as life forms either animal or human type.

[lumberjack_jeff]

1. How many countries are known to not have loch ness monsters?

Longer answer: if life requires meaningful levels of free gaseous oxygen, and liquid water then all of them except one.

[Posteritatis]

2. Problems of proving a negative aside we only really have enough data on one so far. (nt)

[LiberalFighter]

3. So there are living forms on Mars, Venus, Jupiter, the moon, Saturn, Mercury, etc?

Then why aren't we in communication with them?

[Posteritatis]

4. Oh, for - ... okay, no point in this discussion. (nt)

[jberryhill]

11. I am not in communication with squirrels in my trees

And yet, there they are.

[HopeHoops]

5. Trick question. If you're talking about carbon-based, most. That's rather limiting.

[intaglio]

6. Very problematic

Absolutely not? 1, the Moon

Almost certainly not? Mercury, Pluto, Asteroids and Kuiper belt objects.

Highly unlikely? Venus, the gas giants and most of the moons of the gas giants, but we do not know enough about the chemistries that might become life to declare for certain.

Possible but unlikely? Europa and Mars.

Non-Solar worlds so far detected? Not enough evidence or knowledge to even make a guess.

[bananas]

8. Bacteria was found on the moon.

http://science.nasa.gov/science-news/science-at-nasa/1998/ast01sep98_1/

[DetlefK]

9. But they were earth-bacteria, not natives.

[Warpy]

7. None.

We see planets we suspect are too hostile to support even microbes in deep caves. However, we have not been able to confirm that.

[discntnt_irny_srcsm]

10. Just a thought...

...we only know of life here on earth. I read that, as of this past June, we "know of" 786 planets. So 786 - 1 = 785.

[trishnikolic]

12. Life on Planet

I don't know if there is very many planets just like earth, but I think in this universe where there are more stars than the earth has grains of sand, it is very hard to think all that is just meant for humans ! Yes there is life in all sorts of forms.

[kraj8995]

13. Spam deleted by LeftishBrit (MIR Team)