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Purple Planets, Not Green Ones, May Be Key To The Search For Alien Life

The search for alien life has gotten a bit more interesting thanks to new research on the possible existence of purple bacteria on exoplanets.

Fonseca coelhoDathuynh shutterstockM aurelius shutterstockBynadeem sarwarPurple planetsNot green onesMonthly noticesRoyal astronomical societyNew greenEarth like purple worldsMilky way

What Is a Light-year?

It doesn't make much sense that a "light-year" measures distance, but it does. So what does that mean?

M aurelius shutterstockProxima centauriFriedrich besselLight travelsSpace areMilky way

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