Abstract
Abstract Circumstellar gas-and-dust envelope is the relict of the birth of any star, accompanies the star during the most part of the star's lifetime. The Oort's comet cloud probably is the remnant of such an envelope around the Sun. Under favorable circumstances this envelope may be seen against the bright nebulae background as a dark halo around the star. The bulk of the matter of any compact HII region is believed to consist of partly ionized envelopes of stars of a very young cluster.
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