Recent content by xcom2112

I saw this question on special relativity on the internet: "A spaceship traveling to Alpha Centauri, at 0.95C it takes 4.5 years to get there as measured on Earth.how long does it seems to the spaceship passengers?" the answer was 1.4 years (Lorentz factor of 3.2). this answer makes no sense...

I was thinking about the law of conservation of energy, states that energy can neither be created nor destroyed. Then I thought about it more broadly, it actually states that the universe was created with a fixed amount of energy (and this energy only transforms from one form to another) And...