Einstein taught us that mass and energy are two forms of the same thing and that gravity is better understood as the curvature of spacetime that guides motion.
ΛCDM remains the leading cosmological model because our current best measurements indicate gravity is not strong enough to stop the universe’s expansion.
Physicists often talk about the idea that the universe exploded from nothing in a singularity, that idea is more philosophical than scientic. The universe’s expansion is scientific, the singularity itself remains speculative.
Relativity
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