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White Dwarf Stars
White Dwarf Stars

URL - StealthSkater
URL - StealthSkater

Universe timeline - E Natural Health Center
Universe timeline - E Natural Health Center

... The pure energy is transformed into matter. The building blocks of matter are atoms. The energy forms and reforms into about 100 orderly types of atoms, and even more sub-atomic particles, which interact in a highly complex manner due to the void. These atoms are merely pure energy fields of varying ...
The PAMELA Space Experiment
The PAMELA Space Experiment

Why is the Sun very dense on the inside?
Why is the Sun very dense on the inside?

Astronomy and Astrophysics 336, 972, 1998
Astronomy and Astrophysics 336, 972, 1998

... The coolest features that can be isolated from the inhomogeneous temperature distribution are always located close to a latitude of +30◦ . There do not seem to be spots directly centred along the equator nor is there a parallel band of spots at -30◦ as might be expected from the solar analogy. As ma ...
59 - Keele Astrophysics Group
59 - Keele Astrophysics Group

... Sensible heat flux ...
Turbulent kinetic energy spectra of solar convection from New Solar
Turbulent kinetic energy spectra of solar convection from New Solar

... a comparison of the turbulent spectra in the photosphere layer for different resolutions (figure 2(d)) shows faster energy decay for large wavenumbers (small scales) and slightly higher energy density values on larger scales for the low-resolution (50 km) case (blue curve). Such a dependence of the ...
Nucleosynthesis and Chemical Evolution of Oxygen
Nucleosynthesis and Chemical Evolution of Oxygen

Evolution and Magnitudes of Candidate Planet Nine
Evolution and Magnitudes of Candidate Planet Nine

... remains nearly constant, whereas the higher and varying intrinsic contribution in the mid- and far-IR follows the intrinsic luminosity. Non-gray effects can significantly modulate the actual spectrum (e.g., Traub & Oppenheimer 2010). 4.2. Magnitudes in various bands during one orbit ...
Where to Look For Life? - Journey through the Universe
Where to Look For Life? - Journey through the Universe

Words: The Power Within - Endeavor Charter School
Words: The Power Within - Endeavor Charter School

...  Sol + stit (stop, stay)  Literal definition – sun stop  Dictionary definition – (n) either of the two times in the year when the sun reaches its highest or lowest point in the sky at noon, marked by the longest or shortest day  The summer solstice occurs around June 21 and the winter solstice a ...
The Galaxy Luminosity Function
The Galaxy Luminosity Function

lecture 3 `Rapidly rotating convection, dynamos, and scaling laws`
lecture 3 `Rapidly rotating convection, dynamos, and scaling laws`

... However, these results are for imposed fields: in a dynamo flux expulsion may push the field into ropes, and outside the ropes could still get thin columns. Magnetic fields can enhance dynamo action ...
Making Planetesimals - Department of the Geophysical Sciences
Making Planetesimals - Department of the Geophysical Sciences

... petrography of meteorites provide direct confirmation of aqueous alteration, melting, fractionation, and thermal metamorphism among the inner asteroids (Zolensky and McSween, 1988; Farinella et al., 1993; Brearley and Jones, 1998). Because the most common grains in the ISM (silicates and carbonaceou ...
Document
Document

... Hydrogen Balmer lines in spectrum of the star HD 193182 around 20 Balmer lines from H13 to H40 are seen here. (H to H12 are present, but not shown here.) Balmer limit  =364.6 nm ...
and heliacal visibility of star agastya in 1350
and heliacal visibility of star agastya in 1350

nic xiii002
nic xiii002

... 20 F β –decay to 20 Ne has an half life of 11.07 s. The decay is dominated by the allowed transition from the 2+ ground state of 20 F to the 2+ excited state at 1.634 MeV excitation energy of 20 Ne [10]; a non–unique first–forbidden decay branch to the 2− excited state at 4.967 MeV excitation energy ...
Age patterns in a sample of spiral galaxies
Age patterns in a sample of spiral galaxies

Cosmic Connection to the elements
Cosmic Connection to the elements

... Big Bang. Evidence leading to this unusual theory was first discovered in 1929, when Dr. Edwin Hubble had made a startling announcement that he had found that all of the distant galaxies in the universe were moving away from us. In addition, their speed was directly proportional to their distance fr ...
Slide 1
Slide 1

... X-ray emitting gas, clusters typically have masses from 1014 to 1015 solar masses and large amounts of dark matter a diameter from 2 to 10 Mpc . A group is a member of cluster ...
The evolution of helium rich subdwarf B stars
The evolution of helium rich subdwarf B stars

Post-AGB stars in the Magellanic Clouds and neutron
Post-AGB stars in the Magellanic Clouds and neutron

Gas and dust evolution in distant AGN
Gas and dust evolution in distant AGN

... At z>4 little information on NLR metallicity ...but information on gas in host galaxy for some QSOs ...
Physics 41N Lecture 2: Dimensional Analysis
Physics 41N Lecture 2: Dimensional Analysis

... length `. We will assume that the period can be expressed as a product of the variables m and `, each raised to an unknown power: T = k`α mβ , where k is a dimensionless constant.2 The method of dimensional analysis now consists of finding values for α and β that make the dimensions of the right-ha ...
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Standard solar model

The standard solar model (SSM) is a mathematical treatment of the Sun as a spherical ball of gas (in varying states of ionisation, with the hydrogen in the deep interior being a completely ionised plasma). This model, technically the spherically symmetric quasi-static model of a star, has stellar structure described by several differential equations derived from basic physical principles. The model is constrained by boundary conditions, namely the luminosity, radius, age and composition of the Sun, which are well determined. The age of the Sun cannot be measured directly; one way to estimate it is from the age of the oldest meteorites, and models of the evolution of the Solar System. The composition in the photosphere of the modern-day Sun, by mass, is 74.9% hydrogen and 23.8% helium. All heavier elements, called metals in astronomy, account for less than 2 percent of the mass. The SSM is used to test the validity of stellar evolution theory. In fact, the only way to determine the two free parameters of the stellar evolution model, the helium abundance and the mixing length parameter (used to model convection in the Sun), are to adjust the SSM to ""fit"" the observed Sun.
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