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1 Humans are not evolved for long term space travel. Where exposure from radiation, loss of muscle and loss of bone density are important factors to consider. Amongst others. Please see links www.nasa.gov... Or www.esa.int...
2 The speed of light is a major issue for human space colonization especially outside our solar system.
But. All 7 planets in the system are tidally locked. So. Without a nuclear reaction happening like in Earth's core. And not rotating on it's axis. I don't think it will have an Earth like magnetosphere. But may have a magnetic field. Although it still could have a habitable zone where a stable temperature band around the planet might have liquid water.
3 Earth has very good natural protection and, is the best protected planet in our solar system. Maybe our galaxy and possibly the entire universe.
And humans populate only 3% of land. And they're scattered around the globe. The chances of human extinction from an impact event are not as big as maybe we are lead to believe.
4 Sustainability. Feeding humans in space is a real problem. Although space food is meant to be good. Can last for up to 8 years. A long journey is going to require food to be grown on board the ship. And then on the target planet.
originally posted by: watchitburn
a reply to: blackcrowe
All you have listed are just challenges, some of which we already have solutions for. It's just a matter of time.
originally posted by: andy06shake
a reply to: RAY1990
"I think by the time we even consider visiting a nearby system we'll be sprawled about our own solar system."
Well we may find it rather difficult, nevermind counterproductive and not exactly cost effective to build starships at the bottom of the gravity well, which is pretty much where Earth is located system wise.
By the time we are ready to attempt a journey to the next star we will most lightly have colonized our own system via Ion propulsion vessels.
originally posted by: olaru12
It's been over 40 years since we were on the moon. We have had the technology for a long time to establish a moon base for a quest of other planets.
There is a reason we don't have a moon base. There is a reason we are stuck on this prison planet.