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Slide 1
Slide 1

... (c.f. MAGIC: Major Atm. Gamma Imaging Cerenkov E>30GeV –North HESS: High Energy Stereoscopic System E>100GeV –South GLAST satelite E>100MeV) ...
5th grade Solar System Test
5th grade Solar System Test

... Level of MC Question ...
Lecture Notes - NMSU Astronomy
Lecture Notes - NMSU Astronomy

Slide 1
Slide 1

... (like burning 20,000,000 kg of coal) ...
To understand the deaths of stars and how it
To understand the deaths of stars and how it

... • The core basically becomes one giant atom (and the electrons fuse with the protons). • The energy to do this (remember it takes energy to break down atoms if they are smaller than iron) comes from the gravitational collapse. ...
Supernova neutrinos at ICARUS
Supernova neutrinos at ICARUS

... E ~ G MNS2/RNS =1.6 1053 erg (MNS/ M)2 (10 km/RNS) ...
Micro_lect20
Micro_lect20

Stellar Surface Imaging of II Pegasi via Light
Stellar Surface Imaging of II Pegasi via Light

... • II Pegasi was chosen for light-curve inversion because it had been to the difficulty of reliably would mean that the observed to have high variations in its brightness with possibility of spots determining the latitude of individual differential rotation of II Pegasi coverage of about 40% of the v ...
Multiple choice test questions 1, Winter Semester
Multiple choice test questions 1, Winter Semester

... 39) Why are astronauts weightless in the Space Station? A) because the Space Station is constantly in free-fall around the Earth B) because the Space Station is traveling so fast C) because there is no gravity in space D) because the Space Station is moving at constant velocity 40) Why were ancient ...
Sun PPT from class
Sun PPT from class

... There are many different fusions that can take place…for example, • The predominant fusion process in the core of the Sun is the proton-proton chain • Proton-Proton chain fuses four protons into one helium, ...
Chapter 8
Chapter 8

... (“oscillate”) between different types (“flavors”), thus solving the solar neutrino problem. ...
Sample Exam 2
Sample Exam 2

... A. the fastest a white dwarf or neutron star can rotate. B. the closest you can get to a black hole without falling in. C. the most mass a brown dwarf can have. D. the most mass a white dwarf can have. E. the least mass a white dwarf can have. 26. A good way to determine the age of a stellar cluster ...
Day 2
Day 2

... Finally, the rate of fusion becomes high enough to establish gravitational equilibrium. At this point, fusion becomes self-sustaining and the star settles into its hydrogen burning, main sequence life. The main sequence phase is the longest phase of a star's life, about 10 billion years for a star w ...
The Sun*s Energy
The Sun*s Energy

... maintained so that the star does not collapse into itself due to gravity ...
Early Astronomy
Early Astronomy

The Rotational Period of the Sun (Higher Level)
The Rotational Period of the Sun (Higher Level)

Click here to see my Powerpoint - Marshall University Personal Web
Click here to see my Powerpoint - Marshall University Personal Web

... By: Tonya McGrady ...
The Sun and Energy
The Sun and Energy

Ch 22 The Sun & It’s Solar System
Ch 22 The Sun & It’s Solar System

... constant solar winds Auroras may be seen at middle latitudes Compasses may read incorrectly Cellular & cordless telephone reception may be interrupted May interfere with radio frequencies ...
Astronomy 82 - Problem Set #1
Astronomy 82 - Problem Set #1

... Given the low average speed of helium atoms in Jupiter's atmosphere, there should be relatively little “leakage” of helium from Jupiter out into space. Contrast this with the Earth: its escape velocity is much lower (~11 km/s) and its temperature is a bit higher, so there is a slow, but substantial, ...
The Sun and Planets Class Exercise 1.
The Sun and Planets Class Exercise 1.

... planets. In order of increasing distance from the Sun, these are: Mercury, Venus, Earth, and Mars. The remaining outer four planets are the gas giants. Continuing outwards from Mars, they are Jupiter, Saturn, Uranus, and Neptune. In this exercise we will gain a more intuitive understanding of sizes ...
photosphere - Blackboard
photosphere - Blackboard

... (“oscillate”) between different types (“flavors”), thus solving the solar neutrino problem. ...
Solar System Study Guide
Solar System Study Guide

... What is the difference between a planet’s period of rotation and period of revolution? ...
SupernovaExplosionPhysics_8pages
SupernovaExplosionPhysics_8pages

... point the pressure due to electron degeneracy becomes important. This is the pressure which results from electrons being forced to higher-energy states due to the Pauli exclusion principle, which applies to all fermions (spin= 12 h̄ particles), such as electrons or neutrons. Now if M < 1.4M! , then ...
The Sun - Cornell Astronomy
The Sun - Cornell Astronomy

... As central pressure increased, central temperature increased... Central pressure and temperature became so great that Hydrogen atoms could be converted to Helium atoms by nuclear fusion reactions: ...
< 1 ... 180 181 182 183 184 185 186 187 188 ... 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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