Astronomers, including Harvard's Courtney Dressing, announced on Tuesday that they had found eight new planets orbiting their stars at distances compatible with liquid water, bringing the total number of potentially habitable planets in the just-right “Goldilocks” zone to a dozen or two, depending on how the habitable zone of a star is defined.

During the news conference held at the January 2015 AAS convention in Seattle, Courtney said  'I’m going to give you the recipe for a rocky planet.  Take one cup of magnesium ..."

Read More:

• New York Times: http://nyti.ms/1xAAByZ
• CFA Press Release: Super-Earths Have Long-Lasting Oceans
• Scientific American: Newfound Exoplanets Are Most Earth-Like Yet
• Smithsonian Magazine: New Super-Earths Double the Number of Life-Friendly Worlds