Need help with no gravity & no "ground

I'm new to the TGE and here is what I would like to do but I don't know how to start.

I've gone through the example demos that come with TGE v1.5 and they all have a terrain and a "player" that you control.

I want to make a 3D space astroid game. What I would like to do is remove the terrain and gravity so that the player's ship is floating out in space.

All that I would like to have on the screen is the players ship that I can control in 3D space, and asteroids that float around.

Can someone suggest how I can implement this in TGE v1.5.

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