By Jacqueline Mitton
Beautifully-illustrated dictionary; an important consultant to the universe for astronomers of every age.
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Extra resources for Cambridge illustrated dictionary of astronomy
The massive central star of the nebula is blowing off a fast ä stellar wind. The ‘‘bubble’’ marks where the stellar wind encounters the surrounding interstellar medium. 338 Budrosa An asteroid of the rare metallic type discovered in 1892 by Auguste Charlois. 9 AU from the Sun. Bug Nebula A name given to the ä bipolar nebula NGC 6302 in the constellation Scorpius. The star assumed to be at the center is not visible, but gas can be seen streaming out of the hot central region with speeds up to 400 km/s (over 2000 mph).
The prisms also makes the image upright, rather than inverted as it is in an astronomical telescope. g. 10 · 40). bipolar nebula A luminous nebula consisting of two lobes pointing in opposite directions. Any nebula of this shape may be called ‘‘bipolar,’’ but this term is most often used for a group of nebulae that are intense sources of infrared radiation. They are thought to harbor a bright star that is completely concealed by a dense ring of dust and gas around its equator. The dust emits in the infrared because it is heated to a temperature of a few hundred degrees by the radiation from the star.
Observations made from space revealed a vast hydrogen cloud surrounding the head and tail measuring 13 million km in the direction parallel to the tail. BepiColombo A spacecraft that the European Space Agency proposes to place in a polar orbit around Mercury in order to map and survey the planet with a variety of remote sensing instruments. The projected launch date is 2012. The mission is named in honor of the Italian mathematician and engineer Giuseppe Colombo (1920–84) who suggested the trajectory ä Mariner 10 should follow past Mercury in 1974–75.