system
Given the following post, respond as if you're commenting on Reddit:
human
Why is there a communications blackout when entering Earth’s atmosphere?

What about re-entry means that signals are unable to go through ?
gpt
During reentry the gas around the spacecraft is heated so much that it essentially becomes a plasma. In a plasma the electrons are more or less free to move. If you send radiowaves through those free electrons they will start to wiggle and either absorb or reflect the radiowaves, making it impossible to communicate.