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A popular statement found running the rounds in modern colleges and other schools is, "If a tree falls in the forest and there's nobody around to hear it, does it make a sound?" The question posed in the OP video is a spin-off on that.
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Without pointing out the error in the former statement (trees in the forest) Chris Hadfield correctly states the answer, that an explosion in space does make a sound, but there is no medium (air) for that sound to travel in, so as to be communicated to a listener at a distance. IOW nobody can hear it. He gives the example of the enormous noise inherent in the operation of our sun, yet nobody can hear the sun. That's because the sun is surrounded (at least after a few million miles) by no atmosphere. (As a side note, if anyone could survive the approach to the sun at a distance of less than say 2 million miles, there would no doubt be an ever-increasing roar audible as one gets closer to the sun since there would be found some increasing presence of the sun's atmosphere, which gets far more dense upon very close distance from its surface such as less than 2,000 miles. And the intensity of the noise would become so tremendous at some point that its physical effect on any traveler would be no different than what happens to an object located within a few inches of a bomb when it's exploding. The sound the sun makes constantly is much like the shock wave of an exploding bomb.)
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But the popular statement running the rounds of our schools is false. The truth is, when a tree falls in the forest, it makes a sound in all respects, except one. And like all other things liberals or Modernists like to overturn for shock value (like fαɢɢօts do), they only concern themselves with the exception to the rule. The tree falling in the forest causes a physical disturbance to the ground upon impact, which observers nearby would say was "a crash." The tree made a crash when it fell; the crashing noise of a falling tree. Take away the observer, and you don't take away the objective sound; all you take away is the RECEPTION of the sound or its OBSERVATION by an observer. It is therefore a question of perception to which the Modernists limit themselves. They turn an objective case into a subjective case. And subjectivism leads to all kinds of abnormalities. Ask Bishop Williamson.
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Consequently, the Modernist is proud to disagree with people who harbor sound thinking, to say that the tree falling in the forest where nobody can hear it does not make a sound. But they're wrong, because what they're saying is a half-truth, and a half-truth is a whole lie. So Modernists are complete liars. The tree falling in the forest makes a sound. However, it is a sound that only the animals can hear, and only the tape recorders running within earshot can record. The sound the tree makes can cause ripples in the surface of a pond, for example, and the fish swimming in the pond can hear the falling tree's noise. Or if there are no fish, the ripples in the water surface can be seen from a distance by a Forest ranger watching with a powerful telescope, for example. Birds flying through the air can hear the crashing noise of the falling tree. But even in the absence of any living creature hearing the sound or recording it, the sound nonetheless exists. The tree makes a sound when it falls, regardless of anyone being able to hear it. And the sound is carried by the air of the atmosphere around the tree, even if no living creature is within earshot to hear the sound carried by the air.
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The sound of the falling tree is distinguished from the tree falling, but it is not separated; according to the principle, we distinguish but we do not separate. Modernist turn head-over-heels having FITS over that one statement! Like they do with the following statement of fact: "We don't think with our brain." (Which can be demonstrated quite simply.)
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The point is far more clear in the example of space, explained correctly by Chris Hadfield in the OP, since there is no air in space to carry the sound; yet that does not mean there is no sound at all. An explosion in space makes a sound, but a listener located within what would be earshot on earth won't be able to hear it, because the sound has no atmosphere to communicate it. IOW even if the sound could be known, it could not be communicated.
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The full-time environment of space -- the way things are as usual -- is entirely different from what we know as normal here on earth. And the things that are true in space would seem to be heresy on earth.