You would die, of course. But your child already knows that. They want to hear about the specifics. The details of the next few seconds of your life are indeed fascinating, even to an adult. Your child may realize the lack of air as being the enemy, but that’s actually third on the list of fatal environmental conditions. You would  suffocate (eventually), but before that happened the fluids inside your body (blood, water, etc.) would boil due to the zero pressure of space. That means that within the first 30 seconds, your skin and tissues would puff up and