The first ones favor a quick evolution of the Galactic bulge, and the seconds a much slower one.F. CuisinierJ. KoppenA. AckerW. J. MacielConference on Ionized Gaseous Nebulae
Formation and evolution of Earth-like atmospheres involves long-time processes, from H and He accumulation from the stellar nebula in the very early stages of planetary assembly, resulting in H-rich protoatmospheres, to the formation of secondary atmospheres due to ocean magma solidification and stro...
Planetary nebulae are traditionally considered to represent the final evolutionary stage of all intermediate-mass stars (∼0.7–8 M☉). Recent evidence seems to contradict this picture. In particular, since the launch of the Hubble Space Telescope, it
We have seen in Figure 7 that the measured masses and radii of transiting planets can be globally explained in the framework of an evolution model including the strong stellar irradiation and the presence of a variable mass of heavy elements, either in the form of a central core, or spread ...
Chiang E, Laughlin G (2013) The minimum-mass extrasolar nebula: in situ formation of close-in super-Earths. MNRAS 431:3444–3455 ArticleADSGoogle Scholar Coleman GAL, Nelson RP (2016) On the formation of compact planetary systems via concurrent core accretion and migration. MNRAS 457:2480–250...
stellar fusion circumferential zones of uniform elements existed so that pure chunks, our proto asteroids, would be part of the nebula formed by the blast. The heavier elements such as platinum, lead, and thorium may have come from the collision of stellar remnants such as neutron stars (...
stellarmedium(ISM)at10–30GHz,otherthanfree-free, synchrotron,oranhypotheticalRayleigh-Jeanstailofcold dustgrains(e.g.,Leitchetal.1997;Finkbeiner2004;Wat- sonetal.2005).AsproposedbyDraine&Lazarian(1998) apromisingcandidateemissionmechanismiselectricdipole ...
I'd stay away from smaller glass unless you're into the collecting end of the game - I will say little, tiny fracs are quite addicting, and fun to peep through but really, anything under 75mm won't show you all the splendors a larger scope can. I love my refractors but when there...
Amongst those parameters, the stellar density was found to be consistent with a complementary, concurrent asteroseismic analysis. In a first, the 3D orientation of the planets was constrained from the lack of transit-duration variations. The system yielded insights into the composition and evolution ...
multistage core formation models, and the late-veneer model. Some light elements have been postulated in the core to account for Earth’s outer core density deficit. A plethora of constraints on the species and concentration of light elements have been put forward from the perspectives of cosmo...