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Our Galaxy
Stars
An enormous luminous ball of gas that at some stage of its life produces energy by converting hydrogen into helium. Stars are either classified by their evolutionary stage or in terms of their spectra - a measure of the star's temperature.
Star clusters
the groups of stars connected by gravitational forces and common origin.
Nebulae
celestial objects composed mainly of dust and gas
Interstellar medium
Core of the galaxy catapults stars our way - a New Scientist article
Analysis of a stream of stars called Hercules implies that the central bar of the Milky Way acts like a propeller and throws matter outwards.
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