The Expansion of The Universe ( Major Trends In The History of Astronomy)

Bubble had shown definitively that spiral nebulae were external galaxies. In the 1930s he continued work on these objects with the Mount Wilson 2.5-m reflector, which was then the world’s largest telescope. Studies over the next decade revealed that the extra-galactic nebulae could be divided into four main classes: irregular,… Read more“The Expansion of The Universe ( Major Trends In The History of Astronomy)”

The Universe Beyond Our Galaxy ( Major Trends In The History of Astronomy)

The Nature of Nebulae Certain nebulous patches, such as the Magellanic Clouds in the south and the Andromeda Nebula in the north, are clearly visible to the naked eye and have undoubtedly been observed from early times. Comments on the Andromeda Nebula date back to the Arabs in the middle… Read more“The Universe Beyond Our Galaxy ( Major Trends In The History of Astronomy)”

The Overthrow of Classical Concepts ( Major Trends In The History of Astronomy)

In the midst of these cosmological expansions, several events culminated in the abolition of the concept of solid, classical spheres required by mechanistic models of the universe. Copernicus Universe deprived the stellar sphere of its earlier function as the driving force behind celestial motions. A succession of uncommon celestial events… Read more“The Overthrow of Classical Concepts ( Major Trends In The History of Astronomy)”

The Downfall of A Compact Universe ( Major Trends In The History of Astronomy)

Mediaeval astronomical measurements assumed the model of a two sphere Universe. This model postulated the segregation of Earth and sky: the laws of motion and the constitution of the heavens were considered quite separately from the physical relationships governing the behaviour of matter on the Earth. Philosophers considered the heavens… Read more“The Downfall of A Compact Universe ( Major Trends In The History of Astronomy)”

European Developments After Newton ( Major Trends In The History of Astronomy)

Towards the middle of the eighteenth century, European rather than British mathematicians began to investigate the remaining problems in the lunar and planetary theories. Although Newton had provided a solid foundation for the theory of the motions of the Moon and planets, he was not able to account for all… Read more“European Developments After Newton ( Major Trends In The History of Astronomy)”