I’ve been hearing that the speed of light is not a constant since the mid 90s.
Depends on your ‘perspective’............................
Chuck Missler taught this on his Genesis series.
Ever since I was a kid the statement that the speed of light was constant seemed like it couldn't be correct. If a change in direction means a change in velocity, it seems like light striking a mirror and bouncing back or bending when it goes through water would require it to change speed.
Up until the last century, the speed of light being a constant was fine, as we couldn't really measure anything closely enough to be able to make any difference. It's like nobody worried about synchronizing time between towns until railroads and telegraphs. Before then, it didn't make any difference if one town called noon twenty minutes later than another.
I'm still not smart enough to figure out what the ramifications of this study could be, and pop media talking about flying faster than the speed of light with Whoopie Goldberg as our bartender doesn't help.
As far as time travel, they're talking about going into the future. We're doing that all the time anyway, and putting someone in stasis would be easier to accomplish, technically. Going back in time still looks to be impossible, and that's probably a good thing. Personally, I'd get a copy of Gray's Sports Almanac, 1950-2000, then go back to 1955 and bang Leia Thompson.