> wonder if there's a limit to space junk beyond which leaving the Earth in a space shuttle becomes impossible
There is. We don't have the industrial capacity, as a species, to do it.
Not to mention low orbit being self cleaning and higher orbits being exponentially more space. You can map the junk with radar & plot the launch to avoid it.
Not to mention low orbit being self cleaning and higher orbits being exponentially more space. You can map the junk with radar & plot the launch to avoid it.