Today I went down the rabbit of hole of how time passes based on speed. I learned that the passage of time is based on your speed, in simple terms. A photon travels at the speed of light. At that speed time stops passing from the photon’s perspective. From Earth’s perspective the photon travels through both space and time.
Let’s consider Sagittarius A* for moment. It is approximately 26,000 light years away from Earth. From out perspective a photon leaving Sagittarius A* will travel for 26,000 light years before it reaches Earth. From the photon’s perspective it leaves Sagittarius A* and arrives at Earth instantly because time does not pass at the speed of light.
Yeah, it hurts my brain too so I plan to keep learning about the subject to ease the pain. I recommend StarTalk if you have an interest in astronomy and the sciences.
By EHT Collaboration - https://www.eso.org/public/images/eso2208-eht-mwa/ (image link), CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=117933557
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