What did galileos observations demonstrate about stars

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what did galileos observations demonstrate about stars

Sidereus Nuncius, or The Sidereal Messenger by Galileo Galilei

This fine translation is a god-send. . . . Surely you want to read what Galileo wrote. If so buy this book. Van Heldens introduction is scholarly; no one knows more about Galileos telescope; the translation is superb; Van Heldens review of the reception of the Sidereal Messenger is profound; the bibliography is extensive. What more can I say?—David W. Hughes, The Observatory

[Sidereus nunclus] has never before been made available in its entirety in a continuous form, with full notes and comment. The introduction, translation and notes by Van Helden are a splendid example of the best scholarship and fullest accessibility. . . . we can now truly get to grips with the phenomenon of Galileo and what his life and work should mean to us today.—Robert Temple, Nature
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Published 16.11.2018

Stars and Galaxies: Observing the Night Sky

Galileo's Observations of the Moon, Jupiter, Venus and the Sun

Italian astronomer Galileo Galilei provided a number of scientific insights that laid the foundation for future scientists. His investigation of the laws of motion and improvements on the telescope helped further the understanding of the world and universe around him. Both led him to question the current belief of the time — that all things revolved around the Earth. The Ancient Greek philosopher, Aristotle, taught that heavier objects fall faster than lighter ones, a belief still held in Galileo's lifetime. But Galileo wasn't convinced. Experimenting with balls of different sizes and weights, he rolled them down ramps with various inclinations.

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In the spring of , an unknown professor of mathematics at the University of Padua first held a strange object, formed of a short cardboard tube with two lenses fixed at the end. He was not the first to hold a telescope, nor to point it at the Moon and draw what he saw there. So why, years later, do we celebrate that moment as one of the most important in science? We do so because that man, Galileo Galilei, discovered the true face of the Moon — and in doing so, marked a sharp break in our history. From his observations, he drew revolutionary conclusions in terms of physics and philosophy. He immediately realised that the general belief in a difference between the imperfect, changeable Earth and the perfect, immutable heavens — one of the central tenets of Greek and later Christian cosmology — was groundless.

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