Do you believe in extraterrestrials visiting earth?

@Deadcutie Yes, but aren't the laws of physics relative to us as fixed creatures in time and space?

But .... like when you switch on a light bulb, the light emits at the speed of light in all directions. Wouldn't then the light shining to the left be traveling at twice the (so called) speed of light relative to the light shining to the right?

@Heartlander no. Why would it?

@Deadcutie If 2 autos drive in opposite directions at 50 mph, they would be driving away from one another at the rate of 100 mph.

@Heartlander how is that relevant to this topic?

@Deadcutie Oh, I was just pointing out that the laws of physics apply to our place and time in space but once we tumble into vacuums, relativity and infinity, what we think of as lightyears may instead be nanoseconds when measured relative to other ??'s place and time in space.

A lot of very smart physicists put stock in quantum entanglement which leapfrogs millions of lightyears in the blink of an eye. So possibly a visit by an alien who lives a million lightyears away could be just a daytrip.

@Heartlander no, the laws of physics apply to the whole universe, the points of view and relationships are irrelevant.
In your example of the two cars, it is irrelevant that the cars are traveling a combined 2X away from Each other. both cars started at the same source and traveling at the same speed, just opposite directions

@Deadcutie The cars? If they each performed a 180 degree turn and drove towards one another at 50 mph each, the closure rate would be at 100 mph.

I'm not a physicist but I do find myself spellbound by quantum physicist. When they say nothing can travel faster than light they seem to really mean it, "negative" matter moving from one end of the universe to the other instantaneously.

@Heartlander again the cars are still only moving at 50 mph regardless of what the closure rate implies.. I’d like to read a source that mentions matter that can Instantly travel to the opposite sides of the universe ? Because that sounds just science fiction to me

@Deadcutie

Oh ....

Here's an explanation of relativity (cars moving relative to one another) ...

[media=https://www.youtube.com/watch?v=30KfPtHec4s]

For the wormhole/spooky thing do a search on "quantum entanglement". What it suggests is that particles have relationships to one another and sync together, like in pairs or groups. The relationship is instantaneous, even if each of the paired particles are on opposite ends of the universe.

Also try a search on "negative mass". That is really mind blowing. When something with negative mass gets shoved it moves backwards.

Science fiction? A lot of very smart physicists say otherwise.