physics - In Stargate why can you go only in one direction through the gate but radio signals can go both ways?
So why can people and other objects just go in the one direction while radio signals can go both ways? Is that ever explained or is it just fact?
Answer
When matter (e.g. a human) enters the gate, it's converted to energy, that energy is transmitted via the wormhole between the gates, and the receiving gate converts the energy back into the matter it originally was. However, the wormhole can carry electromagnetic energy without conversion. This means radio waves can traverse the wormhole. When a gate dials out, it then takes in matter and transmits it, the receiving gate will not receive matter and transmit it, so it's a one-way affair. This prevents messes that would happen if a person were to be stepping through a gate at the same time someone was coming out from the other side.
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