Quotes from Kosmos — Willem de Sitter
1872–1934 Netherlands
← All quotes by Willem de Sitter
6 quotes
All systems are receding, not from any particular centre, but from each other: the whole system of galactic systems is expanding.
Kosmos (1932)
Is the density anywhere near that corresponding to the static universe, or is it so small that we can consider the empty universe as a good approximation?
Kosmos (1932)
In Einstein's general theory of relativity the identity of these two coefficients, the gravitational and the inertial mass, is no longer a miracle, but a necessity, because gravitation and inertia are identical.
Kosmos (1932)
How does it come about that we have been able to find satisfactory hypotheses to explain electricity and magnetism, light and heat, in short all other physical phenomena, but have been unsuccessful in the case of gravitation?
Kosmos (1932)
Our own galaxy system is only one of a great many, and observations made from any of the others would show exactly the same thing: all systems are receding, not from any particular centre, but from each other: the whole system of galaxies is expanding.
Kosmos (1932)
It is easy to compute the density of a static universe of a radius of two thousand million lightyears, and it comes out only very little larger than the observed density. The actual universe is thus very far from empty, it is, on the contrary, nearly full.
Kosmos (1932)