Saving fuel
When the gravity of a planet is pulling you in, do not waste fuel by trying to fight it. Instead, hit reverse, when you hit the planet, hit the accelerator. You will be be flung out at almost maximum speed.
Last ship
The last ship in the game rotates around Mimas (or wherever the planet/moon/asteroid the base is located) and has a maximum HP of 9,000. You can also find this ship at Venus, guarding the planet. It will take a large amount of money to repair the ship if you manage to disable it. You cannot use it outside of battle, because it sends you to the sun and you cannot move with it. It has homing weapons and a fast overheat rate. As desirable as the ship may seem, it is best that you not try to capture it.