Yes, it is possible for a dropped popcorn kernel from space to pop. However, it is not guaranteed as several factors, such as atmospheric pressure and temperature, can affect the popping process.
The height from which a popcorn kernel needs to be dropped for it to pop depends on several factors, such as the density, temperature, and pressure of the surrounding atmosphere. However, it is generally believed that the kernel needs to be dropped from at least 30,000 feet (9,144 meters) for it to pop.
As the popcorn kernel falls through the Earth's atmosphere, it experiences a decrease in air pressure and an increase in temperature due to the friction with the air molecules. This causes the moisture inside the kernel to turn into steam, eventually building up enough pressure to burst the kernel and create the familiar "pop" sound.
No, a microwave popcorn bag cannot pop in space because it requires a microwave to heat the kernels and create the necessary pressure for them to pop. In the absence of a microwave, the kernels will not pop even if they are in space.
It is possible for a dropped popcorn kernel from space to be edible, but it is not recommended. The extreme temperatures and atmospheric conditions during its descent may affect the quality and safety of the popped kernel, making it potentially harmful to consume.