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And there appears to be four nature themes, or we can call them aspects, of how one is able to harbor complex life. Number one is composition. And this looks at four major elements that make up 93% of terrestrial planets. They are magnesium, silicon, iron, and oxygen. And it's the ratio of these elements that determine whether a planet supports plate tectonics, which helps provide a stable environment over millions of years. Each of these element ratios can be determined by looking at the planet's parent star. They should both be equivalent. So what you're seeing in the star, you're looking at its atmosphere, the star's atmosphere, you'll see the same elements there and the same proportions as you would see on the planet after it's formed. Just drop it. This is repeater station kilo kilo. The second one is the amount of volatiles, volatile and planetary formation are considered as any element that has a low condensation temperature where at least 50% of the element turns into gas. A volatile, this means elements that can readily turn into a gas. A gas is much more able to be blown away by solar wind. Planets like Mercury, for instance, that form in a very hot region of a solar system lack any volatiles. Places further away, like Earth, are full of them. Volatiles like carbon, oxygen, hydrogen, nitrogen, phosphorus, and sulfur. CHNOPS, C-H-N-O-P, if you might be up any way for you to remember that, CHNOPS. Our essential for life, at least as we know it.