On Monday, November 26, 2018 at 2:09:19 PM UTC-6, palsing wrote:
On Monday, November 26, 2018 at 11:25:08 AM UTC-8, Mark Earnest wrote:

If two

objects pass each other at 90 percent the speed of light, one relative to the

other is traveling at 180 percent of the speed of light. You cannot argue with

Einstein. Don't even try.

What you are describing is known as 'closing speed', and the objects appear to approach each other at 180% the speed of light *only* to a third party observer. However, to the folks aboard each vehicle measure the other fellow's speed according to the Lorenz transformation and that speed remains less than c.

Too confusing. Do the math. One spacecraft relative to the other is moving

180% the speed of light. That means there can be no absolute speed, not even

some named speed of light. There is no such thing as 186,000 miles per second.

There is no such thing as one mile per second. It is all relative. I

understand Einstein. Maybe you do not. Since there is no such thing as 186,000

miles per second, things can easily go faster than what is currently perceived

to be the speed of light.