Of a star - finding gaia


Low-mass stars also are formed in associations called T associations after the prototypical stars found in such groups, T Tauri stars. The stars of a T association form from loose aggregates of small molecular cloud cores a few tenths of a light-year in size that are randomly distributed through a larger region of lower average density . The formation of stars in associations is the most common outcome; bound clusters account for only about 1 to 10 percent of all star births. The overall efficiency of star formation in associations is quite small. Typically less than 1 percent of the mass of a molecular cloud becomes stars in one crossing time of the molecular cloud (about 5 10 6 years). Low efficiency of star formation presumably explains why any interstellar gas remains in the Galaxy after 10 10 years of evolution. Star formation at the present time must be a mere trickle of the torrent that occurred when the Galaxy was young.

With regard to mass, size, and intrinsic brightness , the Sun is a typical star. Its approximate mass is 2 × 10 30 kg (about 330,000 Earth masses), its approximate radius 700,000 km (430,000 miles), and its approximate luminosity 4 × 10 33 ergs per second (or equivalently 4 × 10 23 kilowatts of power). Other stars often have their respective quantities measured in terms of those of the Sun.


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