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Lecture 3
Lecture 3

... Hydrogen lines in the visible part of the spectrum (known as the Balmer Series) are created when a photon is absorbed by bouncing an electron from the 1st excited level to a higher excited level. • Photons with just the right energy to move an electron from the 1st excited state to the 2nd excited s ...
Astronomy - GEOCITIES.ws
Astronomy - GEOCITIES.ws

... – Weight is actually a force (F=ma; mass being accelerated) – Gravity will differ based on the mass of the planet, so weight can change. You can be “weightless”, but not ...
8 Grade/Comp.Sci.III adv Course Code: 2002110
8 Grade/Comp.Sci.III adv Course Code: 2002110

The Planets Handout (Download Only)
The Planets Handout (Download Only)

... 1. The inner planets are closer to the sun 2. Mercury is the hottest of the planets 3. Venus is the closest in size to the Earth 4. Earth is the only planet in our solar system known to harbor life. 5. Most scientists agree that there was once large amounts of water on the planet Mars. 6. The meteor ...
because they reflect light from the sun.
because they reflect light from the sun.

... slightly each night so over 365 days it can be found in different positions. ...
Space, time & Cosmos Lecture 4: Our Galaxy
Space, time & Cosmos Lecture 4: Our Galaxy

... Pluto, this supersonic wind must slow down to meet the gases in the interstellar medium. It must first pass through a shock, the termination shock, to become subsonic. It then slows down and gets turned in the direction of the ambient flow of the interstellar medium to form a comet-like tail behind ...
Solutions for Midterm
Solutions for Midterm

4th Six Weeks Review key
4th Six Weeks Review key

Unit 3 Solar System Webquest
Unit 3 Solar System Webquest

... STEP 1: Use your Solar System Graphic Organizer to record information as you research the websites below. Your team should decide how to divide the work so you can meet your deadline. For example, one person may want to focus on researching what’s covered on pages 1 & 2 of the graphic organizer, whi ...
Slide 1 - Mr. Hill`s Science Website
Slide 1 - Mr. Hill`s Science Website

Stars in Their Youth
Stars in Their Youth

Astronomy Assignment #1
Astronomy Assignment #1

... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
1. Which of the following correctly lists our “cosmic address” from
1. Which of the following correctly lists our “cosmic address” from

... 8. If the distance to galaxy A from us is the farther than the the distance to galaxy B from us, which of the following is right? (a) If the two galaxies are within our Local Group, they can move in any directions, but the speed of A must be greater than the speed of B. (b) If the two galaxies are ...
Chapter 11 Unit Notes Lesson 1
Chapter 11 Unit Notes Lesson 1

Lecture17
Lecture17

... Energy is generated through fusion in the core of the star which extends 1/4 of the way to the surface The core contains 1/3 of the mass of the star Temperatures reach 15 million K and the density is 150 times the density of water The energy is transported toward the surface by radiation until it re ...
Advanced information on the Nobel Prize in Physics 2002, 8 October
Advanced information on the Nobel Prize in Physics 2002, 8 October

Chapter 16 Lives of the Stars (Low Mass)
Chapter 16 Lives of the Stars (Low Mass)

Climate and Weather
Climate and Weather

... of the mountains vs. dry and more extreme seasons over on this side? – Orographic Rainfall • Water that evaporates into the atmosphere on the west side (windward side) hits the Cascade Mountains and forms clouds through condensation as it cools at higher altitudes. Clouds can’t get over the mountain ...
Neutrino - RemoveTheVeil
Neutrino - RemoveTheVeil

... treated like a Mushroom (Fed BS and kept in the Dark) this may help. My articles Gravity and Geocentricity may help as well. The first part is obviously designed to be humorous, but it has a lot of modern day Physics Theory in it. ...
THE ITASEL PROJECT: (ITALIAN SEARCH FOR …
THE ITASEL PROJECT: (ITALIAN SEARCH FOR …

... The change of the geliocentic gravitation constant GM is determined for certain – the accuracy increases as the square of the time interval of observations as: = (-6.3±4.24)•10-14 per year (2σ) being with the century changes of semi-major axes of planets determined simultaneously. The positive valu ...
File - Zemali Salem
File - Zemali Salem

... are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, They all have roughly circular orbits in the same direction, and most have at least one moon. They vary widely in size, temperature, composition, and distance from the sun. The solar system contains billions of comets, but most of th ...
12.1 Introduction
12.1 Introduction

... 2.5M star. The homogeneous initial model consists of a mixture of H, He and metals with H mass fraction X = 0.69. The plot shows X as a function of stellar mass fraction m/M for nine models at different ages in Gyr after the onset of H burning, as indicated. The last model is in the shell hydrogen ...
Comets, Asteroids, Meteors and the things beyond Neptune!
Comets, Asteroids, Meteors and the things beyond Neptune!

... • Largest ever found – Hoba meteorite. Over 50 tons. ...
Chapter 2 - Test Bank 1
Chapter 2 - Test Bank 1

... 10. The angle of the sun. 11. The latitude of the solar declination (the point where the sun is directly overhead at noon, or sub-solar point) reaches its northern maximum on the June solstice at 23 1/2° north latitude (the Tropic of Cancer), and moves to the Equator (0° latitude) on the September e ...
Section 15
Section 15

< 1 ... 126 127 128 129 130 131 132 133 134 ... 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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