Velocity Subtraction! Relativistic Velocity Addition Worked Example 2 of 2 | Doc Physics

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Relativity, where nothing is as it seems. Welcome to wonderland, tough guy.
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Bless your kindness. I wish I was half the man you are

pizzaguy
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Man am I confused. What about things traveling in different directions? 

I have this scenario in mind: A universe instantaneously starts existing. There are two identical planets, Planet#1 and Planet#2 separated by a distance L These Planets are not moving relative to each other.

There are also two identical asteroids. Asteroid 1 and Asteroid 2. In this universe asteroids can also be observers.

Asteroid 1 is moving from Planet#1 to Planet#2 with a velocity of 0.9c as observed from both planets.

Asteroid 2 is moving from Planet#2 to Planet#1 with a velocity of 0.9c as observed from both planets.

When the two asteroids pass by each other, how fast will they measure each others velocity? I'm not really understanding the equation I think. Asteroid 1 should observer Planet#2 approaching it at 0.9c but wouldn't Asteroid 2 appear to be moving faster than the speed of light? I know that can't be right. 

NeverFinishAnythi
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I think if the electrons were really going that fast, they would be ionizing. 

andricafe