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When astronomers study an exoplanet’s atmosphere, the evidence can be a tiny change in starlight measured while the planet passes in front of its star. That seems like a difficult signal to distinguish from quirks in the telescope or its instruments.
What checks help researchers decide whether an apparent exoplanet atmosphere signal is genuinely caused by molecules around the planet? I’d like to understand how repeat observations and independent analysis contribute, especially when the data are noisy.
