These vast systems consist of stars, planets, gas, dust, and dark matter, all held together by gravity. The most common type of galaxy is the spiral galaxy, characterized by its rotating arms and central bulge. Examples include our own Milky Way and the Andromeda Galaxy. However, other ...
These vast systems consist of stars, planets, gas, dust, and dark matter, all held together by gravity. The most common type of galaxy is the spiral galaxy, characterized by its rotating arms and central bulge. Examples include our own Milky Way and the Andromeda Galaxy. However, other ...
He was, in 1912, the first to discover that distant galaxies are redshifted, thus providing the first empirical basis for the expansion of the universe. Later, in the 1920s, Edwin Hubble showed that Andromeda was far outside the Milky Way by measuring Cepheid variable stars, proving that ...