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.
A New World: NASA Recalls Voyager 2 Probe's 1989 Neptune Encounter. NASA's Voyager 2 probe captured this image of Neptune five days before its historic flyby of the planet on Aug. 25, 1989. A quarter-century ago, the world got its first good look at the solar system's other blue planet. NASA's Voyager 2 spacecraft made the first-ever flyby of Neptune on Aug. 25, 1989, zipping by the ice giant and its frigid moon Triton in quick succession.