The evolution of a 1.2M⊙ star along the asymptotic branch with continuous mass loss is presented, showing that this mass loss leads to the formation of a PN with a typical central star in its center.doi:10.1007/978-94-009-8500-1_50A. Harpaz...
【解析】题干问的是：根据第 2 段，下列关于十八世纪太阳系起源理论的说法，哪一个是正确的？根据题干the origin of the solar system定位到段首句：关于太阳系起源的一个关键证据是，所有的行星都在同一个方向和几乎同一个平面上绕太阳公转，对应A选项。
Detailed analysis of the substructure of Lyα nebulae can put important constraints on the physical mechanisms at work and the properties of galaxies forming within them. Using high-resolution Hubble Space Telescope (HST) imaging of a Lyα nebula at z ≈ 2.656, we have taken a census of the...
In this paper, we present a simulation for the formation of a 3-ring structure in the SN 1987A nebula obtained by HST observations. The progenitor of the SN 1987A is believed to be a red supergiant (RSG) which then evolved into a blue supergiant (BSG) just prior to the explosion. In...
Boss, A. P. Evolution of the solar nebula. IV. Giant gaseous protoplanet formation. Astrophys. J. 503, 923–937 (1998). Article ADS Google Scholar Keppler, M. et al. Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70. Astron. Astrophys. 617,...
The process of a star's formation begins with a ___. A. 上或才不再低样信即切展记水于明类为准家是上或才不再低样信即切展记水于明类为准家是black hole上或才不再低样信即切展记水于明类为准家是上或才不再低样信即切展记水于明类为准家是 B. 压育济压育济nebula压育济压育济 C. 究...
ISM: individual objects: Pipe NebulaISM: cloudsISM: structureultraviolet: ISMA growing body of evidence indicates that the formation of filaments in interstellar clouds is a key component of the star formation process. In this paper, we present new Herschel-PACS and SPIRE observations of the B59...
A. & Carpenter, J. M. Constraints on the stellar/substellar mass function in the inner Orion Nebula cluster. Astrophys. J. 540, 236 (2000). Article ADS Google Scholar Cunha de Miranda, B. K. et al. Threshold photoelectron spectroscopy of the methyl radical isotopomers, CH3, CH2D, CHD...
ingredient, orbital migration of planets, is drastically changing the model. A new idea, pebble accretion, might change the very basis of the model. We also comment on the formation of the magma ocean and early atmosphere and delivery mechanisms of H2O, C, and N to planets in habitable ...
ancient times to the present day. A survey of more modern ideas, covering the last 200 years or so, highlights the difficulties experienced by theories and also points the way towards the development of a more successful theory. In particular, the current standard model the Solar Nebula Theory...