Why can’t I go faster than the speed of light?

Post by badocr » Wed, Sep 15, 2021, 5:08 PM UTC

darken wrote: post #225

unlaxedneurotic wrote: post #193

Earlier quoted context omitted.

I don't think so. As I understand it, gravity and acceleration are equivalent, if you aren't experiencing any acceleration then time dilation won't occur. (Assuming we are not traveling near the speed of light)

One of the more mindbending things to wrap your head around is that gravity isn't a force (i.e doesn't not cause acceleration in the F=Ma sense.). You're simply on a path through spacetime warped by gravity. Think about it: when you are in free fall you feel 0 acceleration . You appear to be accelerating relative to the ground-- but you're actually motionless in an "inertial reference frame". (Similar to how the astr…

Post by paraschopra » Thu, Sep 23, 2021, 7:13 AM UTC

justusthane wrote: post #58

yawaworht1978 wrote: post #43

Earlier quoted context omitted.

I know this is true, but I never got my head around this, maybe someone can help. So if a photon is emitted from the sun, it's passing earth immediately? Then why does sunlight need 7 or 8 minutes to get to earth? And let's say, i travel one light-year at the speed of light, that should be instantaneous, right? The odometer would show 1 light-year, my watch would should 0 seconds and some decimals. How much would I h…

> So if a photon is emitted from the sun, it's passing earth immediately? Then why does sunlight need 7 or 8 minutes to get to earth? From the photon's perspective, it passes earth immediately. From our perspective, it takes 7 or 8 minutes. > And let's say, i travel one light-year at the speed of light, that should be instantaneous, right? The odometer would show 1 light-year, my watch would should 0 seconds and some…