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13h
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answered | Does Kirchhoff's law of thermal radiation fail for optically thin sources? |
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1d
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Historically, when were the terrestrial planets first called terrestrial planets? The mass, size and density of Jupiter and Saturn would be known post-Newton and Kepler, as soon as the size scale of the Solar System was established. |
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Required temperature for a nova Ten million is a very hot white dwarf (as is one with a surface of 40,000K. The Q I have is why can't the heat be conducted very efficiently to the entire white dwarf core? |
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Does the spacetime interval metric define spacetime as necessarily anti desitter? You have been banned from Physics SE by an algorithm. As explained to you in detail physics.meta.stackexchange.com/questions/14719/… |
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Jul
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answered | How to count observable number of galaxies at a given latitude considering interstellar extinction? |
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Jul
15 |
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How to count observable number of galaxies at a given latitude considering interstellar extinction? Why not give the other formula and the name/reference of the textbook? |
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Jul
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awarded | Nice Answer |
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Jul
15 |
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Can we detect gravitational waves from galaxies merging? When galaxie collide it seems almost inevitable that their central black holes (almost every galaxy seems to have one) will merge. And those produce the observable gravitational waves. |
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Jul
14 |
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In the onion-like elemental layers of a large mature star the neon is closer to the surface than oxygen, even though it is more massive... Why? added 74 characters in body |
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Jul
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answered | In the onion-like elemental layers of a large mature star the neon is closer to the surface than oxygen, even though it is more massive... Why? |
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Jul
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Do maxima in the supernova redshift distribution correspond to generations of dying stars? added 699 characters in body |
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Jul
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Is there such a thing as a black dwarf @PM2Ring both white dwarfs and brown dwarfs are cooling objects supported by electron degeneracy pressure. One generally has a carbon/oxygen composition, the other is hydrogen/helium. They have plenty in common. |
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Jul
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Is there such a thing as a black dwarf added 324 characters in body |
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Jul
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Doubt on conservation of angular momentum for Kepler's laws If you like. Then $\vec{r} = \vec{r_0}/(1 - \alpha(t)) = \alpha'(t)\vec{r_0}$. @DavideMasi |
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Doubt on conservation of angular momentum for Kepler's laws added 140 characters in body |
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Jul
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Doubt on conservation of angular momentum for Kepler's laws $\vec{v} = d\vec{r}/dt$ but since $\vec{v}$ is always parallel $\vec{r}$ then we can say $\vec{v} = \beta \vec{r_0}$ where $\beta$ is a time-dependent scalar and its integral is $\alpha(t)$. $\vec{v}$ can never have a non-radial component if its initial value is radial, since a central force imparts no non-radial acceleration. @DavideMasi |
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Doubt on conservation of angular momentum for Kepler's laws added 65 characters in body |
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Doubt on conservation of angular momentum for Kepler's laws added 177 characters in body |
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Doubt on conservation of angular momentum for Kepler's laws added 154 characters in body |
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Doubt on conservation of angular momentum for Kepler's laws added 120 characters in body |