How special is the Earth, anyway? – Chron

How rare is the Earth? A recent study gives us a better sense than ever, but may be the last update we hear for years to come.SIGN OF LIFE? Scientists believe they’ve detected mysterious radio signal from alien planet
The exact number is not certain – the rate may be as low as one Earth-like planet for every six stars, or as high as two planets for every one star.
As the only planet in the universe known to host life, Earth is often used as an ideal that astronomers can look at to gauge how common…

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