Despite the thousands of exoplanets that have been discovered by astronomers in …

Despite the thousands of exoplanets that have been discovered by astronomers in recent years, determining whether or not any of them are habitable is a major challenge. Since we cannot study these planets directly, scientists are forced to look for indirect indications. These are known as biosignatures, which consist of the chemical byproducts we associate with organic life showing up in a planet’s atmosphere. Infographic credit: NASA’s Goddard Space Flight Center/Mary Pat Hrybyk

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