Stephen Hawking says that humanity must find an alternate to planet Earth in the next couple of centuries failing which our chances of long-term survival are slim. I am hopeful that we will certainly find habitable planets in the vast oceans of space that is our visible universe. I am sure there will be many good candidate planets for colonization in the spiral arms of the Milky Way galaxy itself. What is disheartening is to realize the enormous vastness of galaxies. When you talk about interstellar space and interstellar travel, distances inevitably need to be measured in hundreds and thousands of light years just to begin with. And the rocket technology that we have mastered so far is woefully inadequate for the task of making these interstellar journeys even inside our own galaxy. Certainly, our little, tiny planet Earth will be found to be suffocatingly small for an ever burgeoning population of billions of humans. But there's an irony there though. As long as parts of the huma...
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