"If Aliens Existed Elsewhere in the Universe, How Would" Topic

…They Behave?.

"We all remember the nursery story "Goldilocks and the Three Bears." We delight in telling our children and grandchildren about how Papa Bear's porridge was too hot, Mama Bear's porridge was too cold, but Baby Bear's porridge was juust right. It's not surprising, then, that when scientists began thinking about the fact that Earth's oceans had to stay liquid for billions of years in order for life to survive—the planet's temperature had to be not too hot and not too cold but just right—they christened it the first "Goldilocks planet."

Look at it this way: Like all stars of its type, our Sun has grown gradually brighter over the 4.5 billion years since it formed. When the oceans first formed on Earth, about 4 billion years ago, the Sun was about 30 percent dimmer than it is now, so the planet had to retain a lot more of the incoming solar energy to keep its oceans from freezing. As time went on and the Sun poured more energy onto Earth, the makeup of the planet's atmosphere changed as well, influencing the temperature through the greenhouse effect. Yet in spite of all of this, it appears that the oceans stayed just a few degrees above freezing throughout Earth's history. Not too cold, and not too hot…"
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Amicalement
Armand

Yes, I'm sure they'd be looking for a planet in their Goldilocks Zone. As would we !

(smile)

Amicalement
Armand