We are reaching the point in our study of exoplanets, planets orbiting other stars, where the atmospheres of distant worlds are within the limits of our technology.  Once we could barely see the wobble of a star, the telltale sign of an exoplanet, and now we can see reflected starlight and study a distant atmosphere.  Now we can probe deeper questions, are atmospheres of exoplanets similar to solar system planets? What are they made of? Do other solar systems have the same raw materials as ours? Do they have what we believe to be the raw materials for life? A...