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if there were a contiguous atmosphere throughout the universe it would only be a matter of time before space travel would bring distinct life forms together no different than Columbus meeting the native Americans. as without it space travel may never become a reality.
I think the difficulty in traveling at the required speeds is a much greater hindrance than the lack of atmosphere. In fact, if the universe had an Earth-like atmosphere, in some ways it would make interstellar travel more difficult.
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I think the difficulty in traveling at the required speeds is a much greater hindrance than the lack of atmosphere. In fact, if the universe had an Earth-like atmosphere, in some ways it would make interstellar travel more difficult.
required speeds is a much greater hindrance than the lack of atmosphere ...
you do realize we would be able to colonize all the planets in our solar system with open air spaceports to progress further into space with open air spaceports beyond land masses between solar systems.
I think the difficulty in traveling at the required speeds ...
speed is only an issue if you haven't the capability of intervening ports of entry allowed by a contiguous atmosphere to progressively expand the civilized boundary ever further into the unknown.
"It is probably fair to say that most sailing ships in the 19th and early 20th centuries averaged between 5 – 8 knots on average depending on the size of the ship, the route and the weather."
1 knot = 1.15 mps
lets be real, if you were contained inside the great ship bringing your own atmosphere how many would have made the journey traveling at an average speed of 8 mph. but at that speed in an open atmosphere did not present the least impediment.
the non contiguous atmospher without a doubt is the singlemost obstacle to traveling from our native planet. - a flaw geneses does not address.
I understand the comparison to sea travel, but it doesn't really work. Space is incredibly vast. For example, the Milky Way is estimated to be about 100,000 light years across. The Voyager probe would take 1,700,000,000 years to travel that distance at the speed it is going. That's almost 2 billion years just to go from one side of the galaxy to the other.
The Cosmic Distance Scale
Further, unless we come across planets with life, and life that is compatible with humanity, all food would have to be brought with whoever did the traveling. You talk about colonizing, but what would that entail? Terraforming? Domed, self-enclosed settlements? Bringing along enough soil for growth within any settlement? When sailing across unknown waters, people could at least hope that they'd eventually reach land with drinkable water, edible plants and animals. Any attempt at interstellar exploration could not expect that.
What I was really talking about with atmosphere slowing things down, though, was friction. Traveling through air causes friction, which will limit the speeds one can go at. It takes more force to move something through the friction of air, and it leads to heat on the vehicle. Once something gets into space, that is not an issue; there is almost no friction in space. Trying to travel through space if it contained an atmosphere like Earth would require untenable amounts of fuel.