Planets have to orbit a star, be big enough to form a sphere and keep other objects out of their path around their star.
Newly discovered network of planets could harbor water and life, scientists say
Belgian scientists say three new earth-like planets can sustain life
Dwarf star planets may have habitable atmospheres, MIT scientists say - The Boston Globe
Scientists say this planet smells like rotten eggs
Run For the Border - Imgflip
Venus may still be geologically active after experts spot moving crust
Scientists Say We Have 12 Years To Save The World. Let's Act, by Robert Glazer, Mission.org
Scientists specify size of '10th planet
Scientists say planet Mercury 'painted black
Scientists say planet in midst of sixth mass extinction, Earth's
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