STRENGTHS AND WEAKNESSES OF THE THEORY OF RELATIVITY STRENGHTS 1 - The speed of propagation of gravity is not infinite. 2 - The speed of light is absolute (in vacuum). 3 - The time is variable. (For us the becoming is absolute). 4 - The speed of light is the maximum value. (So far recorded). 5 - The energy and mass are equivalent. WEAKNESSES 1 - All reference frames are equally valid. (Only applies to the speed of light in vacuum). 2 - Time is a dimension of space. (The time is flowing, the space is static, the bodies move in). 3 - It is possible the time travel. 4 - Gravity is not a force. 5 - The cosmological constant.