General Discussion
In reply to the discussion: Trump Is Losing a Second War. The Iran debacle is accelerating the shift away from fossil fuels [View all]Ol Janx Spirit
(1,064 posts)...recently thought impossible.
We've had a continuous presence in space since October 30th, 2000--over 25 years. We have learned a lot from that exercise.
Predictions that humans will not be able to achieve something certainly goes as far back as the human ability to predict things.
On December 17, 1903, Orville Wright flew 120 feet in 12 seconds in the Wright Flyer; on July 20, 1969, humans landed on the moon. It took only 66 years to go from the first controlled, powered flight to the Apollo 11 moon landing.
In 1895, Lord Kelvin, president of the Royal Society, claimed, "Heavier-than-air flying machines are impossible". On October 9, 1903, the New York Times published an article detailing how long it would take for human flight to be achieved, suggesting 1-10 million years, stating that effort might be more profitable elsewhere.
Voyages across the ocean and colonization of foreign lands have a similar history.
I'm sure 30,000 years ago when early humans set off across what we now call the Bering Land Bridge there were other humans watching them walk away and predicting their failure.
All of your points above are valid, but humans have a history of overcoming all odds and developing technology and processes along the way to overcome the always-valid reasons that they should logically fail.
NASA's Opportunity Rover was designed to last only 90 days on the surface of Mars, but it operated for over 14 years using triple-junction gallium-arsenide solar cells which provided power and charged two lithium-ion batteries that allowed the rover to operate during the Martian night.
History tells us not to underestimate what humans will accomplish.