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In 1925, Edwin Hubble's observation of Cepheid variables in the Andromeda galaxy revolutionized astronomy, proving the existence of galaxies beyond the Milky Way. This discovery, aided by telescopes like the Hooker and Hubble, transformed our understanding of the cosmos, leading to modern cosmology and inspiring research into cosmic expansion and galaxy formation.

The Vera C Rubin Observatory in Chile has shared its initial images. These images showcase cosmic wonders like the Trifid and Lagoon Nebulas. The observatory has identified over 2,100 new asteroids. Scientists hope to find a ninth planet. The observatory will scan the sky for the next decade. It aims to understand dark matter and dark energy.