Spacecrafts are made to withstand space by using different types of materials such as beryllium and tungsten to help withstand high melting temperatures. There are also subsystems that help withstand launch loads and solar panels to generate electrical power.
For when they are entering and leaving the atmospheres of planets
A spacecraft should be airtight because space is a vacuum, and a non-airtight spacecraft would vent atmosphere, making it impossible to breathe in the spacecraft.
on the moon you should eat food that is packaged in an airtight package
A robotic spacecraft, is a spacecraft with robots in it,
A reusable spacecraft
The process by which a spacecraft is propelled into space.
Robotic spacecraft
I would think airtight is wrong for wines. The yeast produce gases. If the gas has no way to escape, the airtight bottle might rupture. For that reason, I would go with airlock.
in an airtight bag in the freezer.
Astronauts need a full enclosed location (e.g. spacecraft, spacesuit, etc). As long as it's airtight, and there's a breathable atmosphere inside what they are in, they'll be fine.
If you've hired a reputable builder, they should be relatively airtight. Some builders even have an "air-tightness" warranty.
on the moon you should eat food that is packaged in an airtight package
Something airtight
something airtight
Because thats the way it is
9 seconds
9 seconds
No more than nine seconds.
9 seconds.