Everything we've been taught is a lie, including astrophysics. Look up Steve Crothers, Ken Wheeler, and the Thuderbolt Project. They all have video's on YT. It's an electric universe, no black holes, no curved space, Einstein's math is flawed. Space is the lack of something not a thing in and of itself. Like a shadow is just the absence of light. They have a simpler, more elegant theory that explains things General relativity does not. The speed of light is not a constant. It depends on the medium it travels through. Check it out, very mind-expanding.