1 To be safe, USDA recommends that all pressure canners must be vented 10 minutes before they are pressurized. 2  To vent a canner, leave the vent pipe (steam vent) uncovered (or manually open the petcock on some older models) after you fill the canner and lock the canner lid in place.
There would be no place to land, and the ship would get crushed under Neptune's massive gravity, or ripped apart by its weather. To get there, we would have to build a space ship that can travel extremely fast. Then it would have to orbit Neptune or be incredibly durable to get inside of the planet. It would also need a large supply of O2, food and water.
Saturn and Jupiter have no solid surface. Something could land on Pluto. The current probe en route to Pluto will not even orbit, because it takes so much fuel to decelerate and enter orbit. Craft have landed on Venus.upiter and Saturn have no solid surface to actually land on. Your craft would fall into deeper and deeper more dense layers of atmosphere until it got crushed. Venus would be possible for spacecraft to land on. You would need to take into consideration the immense atmospheric pressure when designing your craft.