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.
The acceleration of gravity on the surface of Neptune is only 1.14 times that on Earth or ~ 11.18 m/s. Neptune has 17 times more mass than Earth, but because it's surface is f â¦ arther away from it's center (3.8 times further) it's surface gravity isn't as great as you might have expected.