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 average distance from the Earth to Neptune is about 4,564 million km and the shuttle at top speed is about 27,870 km/h so forgetting about minor details of acceleration etc, and planets positions, in a straight line, you would reach Neptune in about 18.7 years. Paul Yost.t the fastest current spacecraft speed (other than re-entry from the Moon), which is about 60000 km/hr, it would take at least 100 days to reach Mercury, depending on its pos â¦ ition in its orbit. It could take as long as 120 days.