"Some of them, like sound waves, require a medium to travel through: the waves are fundamentally disturbances in a medium of particles, and in the absence of those particles, an initial "disturbance" has nowhere to go. Others, like light or gravitational waves, are perfectly content to traverse the vacuum of space, seemingly defying the need for a medium altogether."
"For some of us, this is a very counterintuitive notion, as the notion of things existing within and moving through some form of empty nothingness just doesn't make any sense. But plenty of things in physics don't conform to our everyday intuitions, as it isn't up to humans to tell nature what does and doesn't make sense."
"Although there's no way to disprove the aether's (or anything else that's fundamentally unobservable) existence, we can certainly look at the evidence and allow it to take us wherever it will."
Signals throughout the universe propagate in different ways. Sound waves require a medium of particles to travel, while light and gravitational waves traverse the vacuum of space without needing a medium. All signals can be detected through their effects on matter and energy they interact with. The concept of waves traveling through empty space challenges everyday intuition, yet physics demonstrates this occurs through observation and measurement rather than human expectation. Historical scientific investigation began with macroscopic, directly observable phenomena including various types of waves, establishing foundational understanding of wave behavior across different contexts.
#wave-propagation #vacuum-and-medium #light-and-gravitational-waves #physics-intuition #scientific-observation
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