Solar system contains how many stars

Why is it called the Milky Way Galaxy?The Milky Way Galaxy takes its name from the Milky Way, the irregular luminous band of stars and gas clouds that stretches across the sky as seen f. . How big is the Milky Way Galaxy?The first reliable measurement of the size of the Milky Way Galaxy was made in 1917 by American astronomer Harlow Shapley. Assuming that the globul. . Is Earth in the centre of the Milky Way Galaxy?The solar system is about 30,000 light-years from the centre of the Milky Way Galaxy. The Galaxy itself is thought to be about 100,000 light-years. [pdf]
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Why are some stars bright and others dim

What is a star?A star is any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources. Of the tens of billion. . How is a star’s brightness measured?Astronomers define stellar brightness in terms of magnitudes: the apparent magnitude (the perceived and measured brightness of a star) and the abso. . Why do stars tend to form in groups?Stars tend to form in groups because of where star formation occurs. Stars form within a molecular cloud, where protostars begin to take shape in a. . Why do stars evolve?Stellar evolution occurs when a star loses its energy from continuous nuclear fusion reactions, causing instability due to decreasing gas pressure. . [pdf]
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How many stars does our solar system contain

What is a galaxy?A galaxy is any of the systems of stars and interstellar matter that make up the universe. Many such assemblages are so enormous that they contain. . Are all galaxies the same shape?Galaxies differ in shape, with variations resulting from how the systems were formed and subsequently evolved. Galaxies are extremely varied not on. . What are the types of galaxies?Galaxy classification is based on the scheme proposed by the American astronomer Edwin Hubble. Hubble’s scheme is based on the optical appearance o. . What is an example of a Sa galaxy?NGC 1302 is an example of the normal type of Sa galaxy, while NGC 4866 represents one with a small nucleus and arms consisting of thin dust lanes o. [pdf]
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