A comet swept through the solar system carrying a strange chemical recipe — one that has astronomers taking a closer look at what kinds of worlds might form around distant stars. Astronomers studying the** **interstellar comet 3I/ATLAS detected two gases streaming off its icy surface: methanol, a type of alcohol molecule, and hydrogen cyanide, a compound made of hydrogen, carbon, and nitrogen. They spotted them using a powerful radio telescope network, called the Atacama Large Millimeter/submillimeter Array, in Chile. Comets release gases in space when sunlight warms their frozen surfaces. The ice turns straight into vapor and forms a hazy cloud around the comet's head, known as a coma. By measuring the gases in that cloud, astronomers can figure out what ingredients are locked inside the comet's ancient ice. What grabbed researchers' attention wasn't simply the gases but the balance between them.…