A DEEP WELL: Aliens on ‘Super-Earth’ Planets May Be Trapped by Gravity.

To launch the equivalent of an Apollo moon mission, a rocket on a super-Earth would need to have a mass of about 440,000 tons (400,000 metric tons), due to fuel requirements, the study said. That’s on the order of the mass of the Great Pyramid of Giza in Egypt.

“On more-massive planets, spaceflight would be exponentially more expensive,” said study author Michael Hippke, an independent researcher affiliated with the Sonneberg Observatory in Germany. “Such civilizations would not have satellite TV, a moon mission or a Hubble Space Telescope.” [10 Exoplanets That Could Host Alien Life]

As researchers have discovered alien worlds around other stars, one class of exoplanets that popped up was the super-Earths, planets that can reach up to 10 times the mass of our own. A number of super-Earths apparently lie in the habitable zones of their stars, where temperatures can theoretically support liquid water on the planetary surface and thus, potentially, life as it is known on Earth.

To balance things out a bit, shouldn’t evolution on high-gravity planets result in smaller life-forms? And wouldn’t high-mass planets by definition have more resources to exploit for this kind of thing?