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What if aliens can't reach Earth because gravity traps them on their worlds? 5nvklj





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What if aliens can't reach Earth because gravity traps them on their worlds?

Dragon
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What if aliens can't reach Earth because gravity traps them on their worlds? Empty What if aliens can't reach Earth because gravity traps them on their worlds?

Post by Dragon on Mon May 07, 2018 12:36 am

The truth is out there. You want to believe. But you are becoming more and more frustrated because there's no conclusive evidence. All this time, the reason could be basic physics. A study submitted to the International Journal of Astrobiology suggests that aliens living on distant planets can't cruise the cosmos because of gravity.

Man has found numerous exoplanets in the hunt for alien worlds. Most are large planets like Jupiter, while some are the size of Earth or slightly smaller. Others fall somewhere in between and are called super-Earths. They're about 10 times larger than Earth.

Astronomers and astrophysicists believe that super-Earths could shelter alien life. If earthlings can build rockets and explore the universe, why can't extraterrestrials do the same? According to the findings, super-Earths have massive gravitational pulls. These keep alien spacecraft from generating enough thrust to escape the gravitational forces of their home planets. 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 tonnes because of fuel requirements.

"On more-massive planets, spaceflight would be exponentially more expensive," study author Michael Hippke, an independent researcher affiliated with the Sonneberg Observatory in Germany, told Space.com. "Such civilizations would not have satellite TV, a moon mission or a Hubble Space Telescope."

Hippke examined how difficult it would be to blast off from a hypothetical super-Earth. He calculated the rocket sizes needed to escape a super-Earth that is 70 % wider than our planet and 10 times more massive. These are about the dimensions of the planet Kepler-20b, which lies some 950 light years from Earth. On this super-Earth, the escape velocity needed would be roughly 2.4 times greater than on our planet.

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What if aliens can't reach Earth because gravity traps them on their worlds? 334pu7m
Dragon
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What if aliens can't reach Earth because gravity traps them on their worlds? Empty Re: What if aliens can't reach Earth because gravity traps them on their worlds?

Post by Dragon on Mon May 07, 2018 12:38 am



A new discovery by NASA’s Spitzer Space Telescope has revealed seven Earth-sized planets around the M dwarf star known as TRAPPIST-1.

Three of them lie in what is known as the habitable zone -- where there is the potential for liquid water. It is the largest batch of Earth-sized worlds ever discovered in the habitable zone of a single star.

While we don’t know if there is life on the TRAPPIST-1 planets, we do know that any life discovered there would likely be very different from life on Earth. It would have to survive the stormy solar flares of an M dwarf, adapt to a planet that might have extreme temperature swings, and thrive in red and infrared light. All seven


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What if aliens can't reach Earth because gravity traps them on their worlds? 334pu7m
Dragon
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What if aliens can't reach Earth because gravity traps them on their worlds? Empty Re: What if aliens can't reach Earth because gravity traps them on their worlds?

Post by Dragon on Mon May 07, 2018 12:41 am



TRAPPIST-1 is 39 light-years away from Earth, or about 229 trillion miles (369 trillion kilometers). It would take 39 years to get to its current location traveling at the speed of light.

But no spacecraft ever built can travel anywhere near that fast.


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What if aliens can't reach Earth because gravity traps them on their worlds? 334pu7m

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