Title: 7 Good Reasons Why There Might Be Life on Other Planets
Headings: 7 Good Reasons Why There Might Be Life on Other Planets
7 Good Reasons Why There Might Be Life on Other Planets
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DISCUSSION

Content: Given how common exoplanets beyond our solar system have turned out to be, it seems likely that one of them plays host to some form of life. Advertisement
Potentially habitable "Super-Earth" is among 50 newly discovered exoplanets
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4. Sheer diversity and tenacity of life on Earth
Not only did life evolve on Earth under extremely difficult conditions, but it somehow managed to survive megavolcanoes, meteorite strikes, ice ages, droughts, ocean acidification, and radical atmospheric changes. We've also seen incredible diversity of life on our planet in a relatively short period of time, geologically speaking. Life is pretty tenacious. Why couldn't it take hold on one of Saturn's moons, or in another star system? Advertisement
5. Mysteries surrounding how life originated on Earth
Though we have theories about how life originated on Earth, involving those complex carbon molecules I mentioned earlier, there is ultimately a mystery about how those chemicals came together to form fragile membranes that eventually became cells. This mystery has been deepened the more we know about how incredibly hostile the environment on Earth was when life evolved — the atmosphere was packed with methane, and the planet's surface boiled with lava. One common theory is that simple, single-celled life actually evolved elsewhere — perhaps Mars — and came to Earth inside meteorites.