WHILE SITTING UNDER a clear night sky, the moon was all I could see, right there in front, almost touchable.
If you were on the Moon and we had magnifying equipment, we could see each other.
And if I clapped my hands, and waited for you to clap yours in response, we would see a time delay due to the slow speed that light travels. For a moment, you would not see my clap after I had done so, and I would not see your return clap for the same interval of delay — due to the slowness of the speed of light.*
- The moon is about 250,000 miles from Earth, and light travels through space at about 186,000 miles per second. Earth observations of the Moon’s surface are aged more than one second (about 1.3 seconds) in transit time.
USING THE MOON as our yardstick, imagine an inter-stellar distance of 20,000 light years. Anything seen from there happened so long ago, there, it can’t be relevant to us now — at least, it won’t be relevant to me.
Instead, think of how things really are, not as they are seen, where stars are positioned as they would predictably be, but in “real time.” That is, in “universal now.”
There may be planetary life that has evolved in many places during those 20,000 years of light travel, which cannot be seen from here, yet, but remain hidden because of the slowness of light.
WHAT WE DON’T KNOW, because of the slowness of the speed of light, seems guaranteed to surprise us with never-imagined challenges emerging in the future.
Our federal government must be ready to meet any such challenge. Maybe a letter to our elected officials is called for. Hm…