You have to get to where your ship (The Normandy) is stationed on that planet to leave it.
He's on Omega.
If he died in Mass Effect 1 then he is not in Mass Effect 2. If he survived Mass Effect 1 he shows up in Mass Effect 2 but he can not be killed.
No. The mass of a planet affects the number of moons it has. More massive planets tend to have more moons.
No. A planet's gravitational pull is determined by the planet's mass. A planet's orbital speed is determined by the the mass of the Sun and the planet's distance from the Sun.
yes
Not necessarily free roam. Its hopping from planet to planet, with somewhat of a linear structure.
No, Mass Effect 2 has a completely different weapon system.
The Normandy Crash site is located on the planet Alchera (Amada system, Omega Nebula) in Mass Effect 2
Yes. Mass Effect is a good game series and you should start playing the Mass effect 1 on PS 3.
Yes.
If you played Mass Effect 1 the second game imports your old game save, so it would depend on how you played Mass Effect 1 as to whether or not Kaiden is alive. If you did not play Mass Effect 1, then the game will default to the character with the opposite gender to Shepard. So Ashley will be there with a male Shepard, Kaiden for a female one. Below is a link which has the important decisions you make in 1 and their effect in the sequel.
Yes. Mass effect one is available on the play station three.