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September - Youngstown City Schools
September - Youngstown City Schools

... Matter and Motion Most of the cycles and patterns of motion between the Earth and sun are predictable. ...
helium
helium

Chapter 15 The Formation of Planetary Systems
Chapter 15 The Formation of Planetary Systems

BA Training – XRT software
BA Training – XRT software

ASTRONOMY 1         ... You may use this only this study guide for reference... No electronic devises: I pads, lap tops, phones, etc.
ASTRONOMY 1 ... You may use this only this study guide for reference... No electronic devises: I pads, lap tops, phones, etc.

... 3. Why don't we see hydrogen Balmer lines in the spectra of very hot stars (like 45,000 K+/-) 4. What is the he proton-proton chain? Why does it need a high temperature? 5. What is a white dwarf? a supergiant star? A main sequence star? What type is our Sun? 6. The sun generates energy by fusion? By ...
Big Bang, 429
Big Bang, 429

... 3. Why don't we see hydrogen Balmer lines in the spectra of very hot stars (like 45,000 K+/-) 4. What is the he proton-proton chain? Why does it need a high temperature? 5. What is a white dwarf? a supergiant star? A main sequence star? What type is our Sun? 6. The sun generates energy by fusion? By ...
MS PowerPint web page, click here
MS PowerPint web page, click here

... The Scientific Method in Astronomy  Astronomy is one of the most difficult ...
printer-friendly version of benchmark
printer-friendly version of benchmark

... The fusion of hydrogen into helium constitutes what astronomers call the star’s “main sequence” lifetime – roughly analogous to a person’s middle age. The length of this lifetime is related to the star’s mass, although not in the way one might imagine. The most massive stars undergo fusion at an ext ...
The Stellar Cycle
The Stellar Cycle

... Answers: 1. OU6_StarLife star, 2. end as a WD, 3. no RG phase, lifetime longer than the age of the Universe, 4. MS, 5. WD ...
What are the components of our solar system? How would the solar
What are the components of our solar system? How would the solar

... a. Students use the model to describe that gravity is a predominantly inward-pulling force that can keep smaller/less massive objects in orbit around larger/more massive objects. b. Students use the model to describe that gravity causes a pattern of smaller/less massive objects orbiting around large ...
First generation stars
First generation stars

Stellar Evolution
Stellar Evolution

1: The scientific name for my field is astronomy
1: The scientific name for my field is astronomy

... o D: Black Dwarf: The remains of a white dwarf star which “died,” or the remains of a red dwarf star which ran out of hydrogen, and does not have the mass to fuse helium, so it runs out of energy and dies. A white dwarf star is the remains of a sun-like star that was a red giant. The red giant ran o ...
15-3
15-3

Photometry
Photometry

... • Brightness falls off as the square of the distance d. • Absolute magnitude M recalculates the brightness as if the object was 10 pc away. ...
ph507lecnote07
ph507lecnote07

... as surface temperature rises and contraction continues. ...
В современной астрофизике одной из наиболее
В современной астрофизике одной из наиболее

STARS
STARS

... •May take millions of years for energy to work its way through star to surface ...
The Sun - Sophia
The Sun - Sophia

... Sun’s Magnetic Field • Winds up due to differential rotation • Eventually forms loops and becomes tangled ...
Watch - ggg999.org
Watch - ggg999.org

... “High degree” modes sample only the surface ...
Average absolute magnitude
Average absolute magnitude

... Hubble’s law states that v =H0d, where v is the relative recessional speed between galaxies, d is their separation and H0 is the Hubble constant. Recent measurements place the value of H0 in the range 60 to 90 km s–1 Mpc–1. Estimate, in seconds, the maximum known age of the universe. ...
Lecture 3 - The University Centre in Svalbard
Lecture 3 - The University Centre in Svalbard

... The Moon orbits the Earth, which in turn orbits the Sun. Thus, sometimes the Moon will be located between the Earth and the Sun and we will experience what we call a solar eclipse. By a coincidence he Sun and the Moon appear to have the same size in the sky as seen from the Earth. The shadow of the ...
script
script

... The strength of the Lithium line can be calibrated with age, but it is generally not that good. In a solar type star the presence of Lithium most likely means it is young. But the processes that affect the strength of lithium are poorly known. For instance, strong Li is also found in some evolved gi ...
File
File

... energy of the Sun’s mass could be converted into thermal energy. ...
10Sept_2014
10Sept_2014

... original research papers. The proposal is due two weeks before the end of the classes. ...
< 1 ... 135 136 137 138 139 140 141 142 143 ... 237 >

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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