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programming numerical algorithms for astrophysical applications.


Sep
15
comment Are there stars that don't emit visible light?
@jwenting Jupiter is not a star, but a planet. Stars are defined to undergo (or have undergone) hydrogen burning (H$\to$He fusion). This requires a minimum mass of about 0.08M$_\odot$. Objects smaller than that, but massive enough to have some fusion (Li) early on are brown dwarves. The mass limit here is about 10M$_{\mathrm{Jupiter}}$.
Sep
13
comment Are there sufficient observational data to measure non-Newtonian perihelion advances of any Asteroid and Comet orbits?
Use ADS to search for publications (via author names, title words, keywords, or words from the abstract) and even read their abstract for free. Almost all astronomy papers are also published on the arXiv (linked from ADS), where you can obtain (a preprint version) for free.
Sep
12
revised the metal distribution in our solar system
added 346 characters in body
Sep
12
revised the metal distribution in our solar system
added 346 characters in body
Sep
12
answered the metal distribution in our solar system
Sep
12
revised any unique phenomenon when the cores of two planets are aligned with their star's core?
explained probability of exact alignement
Sep
11
answered any unique phenomenon when the cores of two planets are aligned with their star's core?
Sep
11
comment Are there sufficient observational data to measure non-Newtonian perihelion advances of any Asteroid and Comet orbits?
If you want to write a scientific publication, then search the published literature.
Sep
11
comment How many astronomers are there in the world today?
I didn't know your source, but I would have estimated the same number. However, there are many more (about the same number) with a PhD in astronomy who didn't follow it up with an academic career.
Sep
11
answered Milky Way Formation
Sep
11
revised Mechanism for Brown Dwarf Fusion
edited body
Sep
9
revised Determining effect of small variable force on planetary perihelion precession
corrected algebra and summary
Sep
9
revised Determining effect of small variable force on planetary perihelion precession
deleted 190 characters in body
Sep
8
comment When will the Milky Way “arrive” at the Great Attractor, and what all happen then?
Given the accelerated expansion of the universe, is it at all clear that the MW will be arriving there (supposing it it indeed on course)? Note that the mysterious force (coined dark energy) driving the accelerated expansion is opposing the gravitational attractions.
Sep
7
comment Milky Way Formation
Neither, but both!
Sep
6
comment Could the universe have evolved differently?
Well, the underlying hope is that all those fine tunings are only apparent but not real. In other words, the universe naturally obtains an apparently fine-tuned situation in a way still unbeknown to man. In yet other words, the universe only appear fine-tuned because of our ignorance/lack of knowledge.
Sep
6
comment Birthdate differences calculation relative to earths orbit duration
Since birth times are recorded in calender time rather than sidereal or orbital times, you simply take the difference in calender times: You are 365 days (since 1938 was not a leap year) and 18 hours older than your friend.
Sep
6
revised Determining effect of small variable force on planetary perihelion precession
added 80 characters in body
Sep
6
revised Determining effect of small variable force on planetary perihelion precession
fixed minor error in algebra; added minor clarification in conclusion.
Sep
5
comment What known comets are binary?
@PeterHorvath see edit.