We Used Science to Create the Perfect Super-Earth
Kurzgesagt – In a Nutshell
Imagining A Perfect World 0:00
Earth looks like a paradise but much of it is actually hostile, covered in ice, fire, rock or darkness. The video imagines a planet designed for life to reach its fullest potential, a superearth called Hestia, named after the Greek goddess of the comfy home, built to be superhabitable rather than merely livable.
Choosing The Right Star 1:00
A yellow dwarf like the sun is not ideal because it dies within ten billion years and grows hotter with age, meaning seventy percent of Earth's habitable window has already passed. Red dwarfs live almost forever but tend to tidally lock their planets and blast them with deadly radiation when young. The best choice is an orange dwarf, sitting between red and yellow dwarfs, with stable energy output and a lifespan of up to seventy billion years, so Hestia orbits one born three billion years ago in a calm part of the galaxy.
Building A Habitable Planet 2:31
Hestia has 1.3 times Earth's radius, seventy percent more surface area, and twenty percent stronger gravity. To avoid becoming a dead world like Mars or Venus, it gets a massive metallic core generating a protective magnetic field, plus plate tectonics that recycle carbon dioxide and bring nutrients to the surface, preventing runaway heat and volcanic catastrophe.
Shaping Seasons And Land 5:04
A slight axial tilt and thirty six hour days create mild seasons that drive migration and evolutionary pressure, and four small moons stabilize the planet without causing harsh disruption. Hestia avoids Earth's problem of dry continental interiors by having fragmented plates that form an archipelago of dozens of continents and millions of islands, all with access to water and none of them deserts.
Warmth And Tropical Life 6:30
Hestia is five degrees warmer than Earth, turning it into a world of tropical forests and ice free poles, ecosystems that on Earth already hold more biomass and, in the case of rainforests, fifty percent of species on just ten percent of land. Its plants grow in darker shades to capture the fainter light of its orange sun, and isolated islands produce huge numbers of specialized, unusual species.
A Thicker Richer Sky 8:00
Hestia's atmosphere is nearly one and a half times Earth's pressure and richer in oxygen and carbon dioxide, which could fuel devastating wildfires except that heavy rainfall keeps them in check. Higher oxygen allows animals to grow far larger and have faster metabolisms, and the dense air makes flight cheap, so evolution repeatedly produces flying creatures, including giant sky whales that never touch the ground.
Shallow Sunlit Oceans 10:02
Unlike Earth, where sunlight only reaches two hundred meters and ninety five percent of the ocean is permanently dark, Hestia's oceans are mostly shallow continental shelves fully within the sunlit zone, hosting coral megacities and kelp forests. Its coastlines, forty five times longer than Earth's, are especially important since such zones hold over half of marine life despite covering only seven percent of ocean area, helping Hestia support hundreds of millions of species compared to Earth's roughly nine million.
Possible Intelligent Life 12:03
With so many ecosystems and opportunities, intelligent life could emerge on Hestia, possibly multiple times at once, raising questions about how such civilizations might treat each other and the abundant nature around them. The video closes by noting that while Hestia is imaginary, a planet like it could plausibly exist somewhere among the universe's countless worlds.
AI-generated summary. It can be wrong or incomplete - check anything that matters against the original.
