Space

Water and temperature.

luck...........

As you look into it you will realize that our orbit if it was just slightly larger we would be a cold planet, still maybe possible life, or a little closer to the sun it would make death valley look like a resort.

....or carefully planned.

I think we don't know there isn't . . .

Otherwise, why would NASA be looking for it on Mars?

There may be life on the other planets. It's just not the type that is up walking around so that we can easily see it from here. Or from space orbiting with an unmanned space vehicle. Or on the ground with robotic equipment.

We may need to be there on the ground with our microscopes and other various test equipment. When it reveals it self. Until then it is a little soon to say there is no life on the other plants.

Before asking why, ask whether.

oh great, lets take it one more step in that direction and get philosophical.

define life.

Thats a trick question so think about it before answering

I suppose you mean no life on other planets within the solar system? It's very much an open question among those who think about these things whether there is life (including intelligent life) in our galaxy, or in other galaxies.

Codey

Currently, Earth is the only planet in the Solar System proven to be inhabited. This is because of a fortuitous combination of factors: the correct distance from the Sun to have liquid water, an atmosphere capable of sustaining life (as we know it), and the ozone layer and magnetic field, which blocks harmful radiation from striking the Earth's surface. These factors are not known to exist on the other planets; however, they may have existed on Mars in the past, which is why NASA is searching for evidence of life there.

Dvader1000

you don't know that look at post #9

Thank You very much. That helped loads!

In Carl Sagan's book, Cosmos, he described the way that life may have evolved.

Imagine the different elements floating or lying around in space or some planet. How big are the chances that the perfect set of elements combine under the right conditions such that life suddenly comes into being?

An experiment was conducted where the elements were placed in a sealed gas jar and subjected to lightning (simulated by electrical discharges), light, and whatever conditions existed in primeval earth. The jar became coated with a complex brownish substance which resembled the same material as life forms but not alive.

So while it may be simple to gather all the necessary elements, the right conditions are far from easy to obtain.

I believe that was called primordial soup

your comment;

So while it may be simple to gather all the necessary elements, the right conditions are far from easy to obtain.

would that be luck?

"Guess I did use a lot of words just to mean "luck" huh?

it was still good reading