The star nebulae exists in the space between the other stars, also known as interstellar space. The closest space which is known as a nebula to Earth is the Helix Nebula. It is the remnant of a star dying that too possibly one like the Sun. It is said to be approximately 700 light-y...
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Our carbon abundance measurements represent the first of their kind for the Helix Nebula. The S/O ratio that we derive is anomalously low; such values are found in only a few other planetary nebulae. The central star properties, the supersolar values of He/H and N/O, and a solar level...
These changes necessitate a revision in the cosmic abundances and in the composition of the nebula from which the planets accreted (which have been based on chondritic values). These new values imply that the mantle could contain about 15 weight percent FeO and more CaMgSi$_{2}$O$_{6}$ ...
The strong stellar winds provide by a large energy source for locally accelerating cosmic rays, which would modify the composition of the solar nebula by nuclear reactions 展开 DOI: http://dx.doi.org/ 被引量: 14 年份: 1984 收藏 引用 批量引用 报错 分享 ...
They do not represent the original state of material from the initial condensation of the solar nebula, but have been “differentiated” by heating, melting, and recrystalization of the rocks. Why some asteroids apparently have not been significantly heated during their formation and others seem to...
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Why didn't the planets become stars, assuming that they condensed out of the same primeval nebula as the sun? Describe the changes in the way stars undergo nuclear fusion as they age. Explain the sun's structure. What characteristic distinguishes an element from a compound? Explain how super...
The Earth began to gravitationally accumulate out-of-solar nebula debris surrounding the newly ignited Sun, approximately 4.5 billion years ago. The process of gravitational accumulation is a snowball effect: clumping materials form a larger body which increases it's gravity which causes it to subsequ...
Unlike asteroids, comets preserve a nearly pristine record of the solar nebula composition. The presence of cyanides in comets, including 0.01 per cent of methyl cyanide (CH3CN) with respect to water, is of special interest because of the importance of C–N bonds for abiotic amino acid ...