As we cast ourgaze upon the world, we are invariably looking into the past, a consequence of light's finite speed. When we scrutinize galaxies distant by 3 billion light-years, we perceive them as they were 3 billion years ago. We observe the Sun as it was 8.5 minutes prior. Were you standing before me, I would perceive you as you were a minute 1.01670336 nanoseconds ago, as the light reflected from your visage would reach my eyes following this duration. While our minds inhabit their present, we observe everything else in its past context.
Furthermore, as can be deduced from these images, our eyes are capable of perceiving only a minuscule portion of the light that naturally occurs. To observe the infrared, for instance, we fabricate instruments that unveil the enigmas of a universe we would otherwise remain oblivious to.
The universe is a marvel of wonders; do you not concur?
Credits: NASA
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