.. Opening the hatch

Now, let's examine the surroundings. There's the ladders to climb there. But there's also that rail going up.

Well, could you use shoot the hatch with some missile etc?

Shoot the hatch with the fire extinguisher. You can use the rail to guide the extinguisher.

You have to attach something on the extinguisher. ( Try to find a piece of wire. )

Examine and interact with the astronomical mumbojumbo. You can now pick up the piece of wire.

Put the piece of wire into the rail. Next, attach the extinguisher into the hook thing. Use the ram rocket to open the hatch.