Science

The law of conservation of momentum means that the total momentum of a system remains constant when it is not subject to external forces or when the sum of the vectors of external forces is zero

The more "nucleons" an atomic nucleus contains, the greater its mass, but scientists have found that the average mass of the "nucleons" of different elements is different

In 2013, CERN discovered the existence of the Higgs boson for the first time.

Since gravity is actually a manifestation of gravity, and the magnitude of gravity is proportional to mass, for those objects with smaller masses, their own gravity is smaller

The reason we don't see time travelers is actually because they are not in our timeline

In the evolutionary history of human beings, the gradual increase in brain volume is an important marker

A rigorous discussion of the unknown is not possible, so it is necessary to narrow down the universe we are discussing to only the universe we can see

If we make the space station in space into a ring and let it rotate, then the humans in it will also feel the "centrifugal force" to "push" themselves towards the outer wall of the space station

In theory, when a civilization develops into a civilization that can cross the stars, there is basically no risk of extinction

It has long been discovered in practice that the phenomenon of "gravitational time dilation" does exist