There's a famous equation called the "Drake Equation" that is a way to calculate how many intelligent races of beings might be present in the Milky Way galaxy. Read more about that in Wikipedia.
One of the factors in the equation is this:
ne = the average number of planets that can potentially support life per star that has planets.
Well, that number may have an actual value now.
"By studying NASA satellite data, the experts from the University of Warwick have found another 85 'exoplanets' – planets outside our solar system.So now there's a number for ne . Or, actually, there's a range of numbers. But at least there's a limit on the range.
Their size ranges from about 11,000 miles to a whopping 350,000 miles in diameter – so all are larger than Earth (just under 8,000 miles).
But, like Earth, they're potentially the right distance from their host stars to have a temperature that can sustain life – known as the 'habitable zone'."
Oh, c'mon. There's got to be at least one other type of intelligent beings in this galaxy, right? Even if they do look like this:
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