Einstein’s latest anniversary marks the birth of modern cosmology

1917 paper introduced infamous cosmological constant in equation describing gravity

Andromeda galaxy

Edwin Hubble’s observations of stars in the Andromeda galaxy (shown) demonstrated that the universe was vastly bigger than Albert Einstein realized. Nevertheless, Einstein’s paper applying his general theory of relativity, published a century ago, became the foundation for the modern science of cosmology.

Bill Cooke/Meteoroid Environment Office/MSFC/NASA

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