The sun, yellow dwarf star at the heart of the solar system
... The electric currents in the sun generate a magnetic field that extends out into space to form the interplanetary magnetic field. The volume of space controlled by the sun's magnetic field is called the heliosphere. The sun's magnetic field is carried out through the solar system by a stream of electric ...
... The electric currents in the sun generate a magnetic field that extends out into space to form the interplanetary magnetic field. The volume of space controlled by the sun's magnetic field is called the heliosphere. The sun's magnetic field is carried out through the solar system by a stream of electric ...
ASTR 1120H – Spring Semester 2010 Exam 2 – Answers The
... H II regions (also known as emission nebulae) are regions of gas that have been ionized by UV radiation from nearby hot stars. The hydrogen nuclei (i.e., protons) and electrons recombine in excited energy states and when the electron cascades back down toward the ground state, the transition from n ...
... H II regions (also known as emission nebulae) are regions of gas that have been ionized by UV radiation from nearby hot stars. The hydrogen nuclei (i.e., protons) and electrons recombine in excited energy states and when the electron cascades back down toward the ground state, the transition from n ...
Our Very Own Star: The Sun - cmase
... The Sun is a very big ball of hot gases. – The flame of a candle is also hot gases. – If you look closely at the candle, you can see brighter and darker spots in the flame. – The hot gases of the Sun also show darker and lighter spots, and the gases move and ...
... The Sun is a very big ball of hot gases. – The flame of a candle is also hot gases. – If you look closely at the candle, you can see brighter and darker spots in the flame. – The hot gases of the Sun also show darker and lighter spots, and the gases move and ...
Notes: Sun
... 1. Does the Sun have a solid surface? 2. Since the Sun is so bright, how is it possible to see its dim outer atmosphere? 3. Where does the solar wind come from? 4. What are sunspots? Why do they appear dark? 5. What is the connection between sunspots and the Sun’s magnetic field? 6. What causes erup ...
... 1. Does the Sun have a solid surface? 2. Since the Sun is so bright, how is it possible to see its dim outer atmosphere? 3. Where does the solar wind come from? 4. What are sunspots? Why do they appear dark? 5. What is the connection between sunspots and the Sun’s magnetic field? 6. What causes erup ...
Solar Interior 2 (Petrie)
... 3. "If it were not for its magnetic field, the Sun would be as dull a star as most astronomers think it is." (reported by P. Sturrock) ...
... 3. "If it were not for its magnetic field, the Sun would be as dull a star as most astronomers think it is." (reported by P. Sturrock) ...
6-8 question answers
... The Sun will burn up all of its Hydrogen in the next 5,000 years. FALSE. While the Sun will eventually burn itself out, it will not happen this quickly. In the last 4.6 billion years since the Sun’s birth, it has used up roughly half of its fuel only. There is enough Hydrogen for the Sun to last ano ...
... The Sun will burn up all of its Hydrogen in the next 5,000 years. FALSE. While the Sun will eventually burn itself out, it will not happen this quickly. In the last 4.6 billion years since the Sun’s birth, it has used up roughly half of its fuel only. There is enough Hydrogen for the Sun to last ano ...
Astronomy lab: Planets
... Use appendix 11 in the Field Guide for February 15, 2006 to complete the following table: Object ...
... Use appendix 11 in the Field Guide for February 15, 2006 to complete the following table: Object ...
Document
... The Heart of the Sun Given the Sun’s mass and energy production, we find that, on the average, every kilogram of the sun produces about 0.2 milliwatts of energy This is not much—gerbils could do better— but it continues through the 10-billion-year lifetime of the Sun We find that the total lifetime ...
... The Heart of the Sun Given the Sun’s mass and energy production, we find that, on the average, every kilogram of the sun produces about 0.2 milliwatts of energy This is not much—gerbils could do better— but it continues through the 10-billion-year lifetime of the Sun We find that the total lifetime ...
The Sun and Its Solar System Topic 1
... volume could hold more than 1 million Earths. Its mass is 745 times greater than all the planets together. BACKGROUND: For a particle travelling at the speed of light, it would take 8 minutes and 20 seconds (on our clock) to travel between the sun and Earth. (a) ...
... volume could hold more than 1 million Earths. Its mass is 745 times greater than all the planets together. BACKGROUND: For a particle travelling at the speed of light, it would take 8 minutes and 20 seconds (on our clock) to travel between the sun and Earth. (a) ...
Activity 3
... P is power, e is the emissivity (take to be 1), σ=5.67x10-8 W/(m2*K4)is the Stefan-Boltzmann constant, A is the surface area of the emitter and T is the temperature. We know that the Sun shines because of nuclear reactions in its core. We refer to these nuclear reactions as nuclear fusion because 4 ...
... P is power, e is the emissivity (take to be 1), σ=5.67x10-8 W/(m2*K4)is the Stefan-Boltzmann constant, A is the surface area of the emitter and T is the temperature. We know that the Sun shines because of nuclear reactions in its core. We refer to these nuclear reactions as nuclear fusion because 4 ...
The Melbourne Solar System Trail
... 10-12 billion years. The Sun contains 99.86% of the total m ass of the solar system and its gravity holds all of the planets in orbit. M ercury is the closest planet to the Sun. Like the Earth’s m oon it is a grey barren world covered in a thick layer of dust and heavily scarred with im pact craters ...
... 10-12 billion years. The Sun contains 99.86% of the total m ass of the solar system and its gravity holds all of the planets in orbit. M ercury is the closest planet to the Sun. Like the Earth’s m oon it is a grey barren world covered in a thick layer of dust and heavily scarred with im pact craters ...
Origin of Elements - Madison Public Schools
... – almost exactly what is observed in the visible universe. ...
... – almost exactly what is observed in the visible universe. ...
The Sun
... By observing sunspots, scientists have learned that the sun rotates. Sunspots appear to move across the face of the sun. This is because the sun rotates on its axis. But it rotates faster at its equator than it does at the poles. This is called differential rotation. It rotates once every 27 days at ...
... By observing sunspots, scientists have learned that the sun rotates. Sunspots appear to move across the face of the sun. This is because the sun rotates on its axis. But it rotates faster at its equator than it does at the poles. This is called differential rotation. It rotates once every 27 days at ...
here
... • Many of these are “changes” of the Earth • Students consider the Sun itself to be pretty constant. – Not a bad assumption but certainly not correct – Solar Constant: 1300 - 1400 W/m2 ...
... • Many of these are “changes” of the Earth • Students consider the Sun itself to be pretty constant. – Not a bad assumption but certainly not correct – Solar Constant: 1300 - 1400 W/m2 ...
Universe 8e Lecture Chapter 16 Our Star, the Sun
... The Active Sun: The Sun’s surface features vary in an 11-year cycle. This is related to a 22-year cycle in which the surface magnetic field increases, decreases, and then increases again with the opposite polarity. Sunspots are relatively cool regions produced by local concentrations of the Sun’s ma ...
... The Active Sun: The Sun’s surface features vary in an 11-year cycle. This is related to a 22-year cycle in which the surface magnetic field increases, decreases, and then increases again with the opposite polarity. Sunspots are relatively cool regions produced by local concentrations of the Sun’s ma ...
approximate temperature of the corona
... which spreads out an enormous distance from the Sun. The poles show the orientation of the Sun. A false eclipse or coronagraph view of the corona can be produced when a total eclipse is not occurring. An opaque, circular disc, which blocks out the majority of light from the Sun, allows the appearanc ...
... which spreads out an enormous distance from the Sun. The poles show the orientation of the Sun. A false eclipse or coronagraph view of the corona can be produced when a total eclipse is not occurring. An opaque, circular disc, which blocks out the majority of light from the Sun, allows the appearanc ...
The Sun - Our Star - Academic Computer Center
... Heating of the Chromosphere and Corona • While the Sun’s magnetic field cools sunspots and prominences, it heats the chromosphere and corona • Heating is caused by magnetic waves generated in the relatively dense photosphere – These waves move up into the thinning atmospheric gases, grow in magnitu ...
... Heating of the Chromosphere and Corona • While the Sun’s magnetic field cools sunspots and prominences, it heats the chromosphere and corona • Heating is caused by magnetic waves generated in the relatively dense photosphere – These waves move up into the thinning atmospheric gases, grow in magnitu ...
HW #01
... What are the two main gases in the Sun? How does the Sun's mass and size compare with Jupiter? What goes on in the core, Envelope (radiative zone, and convection zone) of the Sun? How does nuclear fusion produce energy? Why does nuclear fusion need high temperatures and densities? Why is it so hard ...
... What are the two main gases in the Sun? How does the Sun's mass and size compare with Jupiter? What goes on in the core, Envelope (radiative zone, and convection zone) of the Sun? How does nuclear fusion produce energy? Why does nuclear fusion need high temperatures and densities? Why is it so hard ...
Stars, Galaxies, and the Universe
... they release energy, which can produce beautiful glowing light in the sky. Sometimes referred to the northern or southern lights since they occur near the poles. Can destroy orbiting satellites and harm astronauts ...
... they release energy, which can produce beautiful glowing light in the sky. Sometimes referred to the northern or southern lights since they occur near the poles. Can destroy orbiting satellites and harm astronauts ...
The Quivering Sun: Helioseismology (PowerPoint version)
... Helioseismology allows us to investigate the physical structure of ...
... Helioseismology allows us to investigate the physical structure of ...
Quiz # 10
... Physicists Kelvin and Helmholtz in the last century proposed that the source of the Sun's energy could be: a. radioactive rocks b. a slow contraction c. meteorites falling in d. the annihilation of antimatter e. nuclear fusion Today we realize that the source of energy for the Sun is a process calle ...
... Physicists Kelvin and Helmholtz in the last century proposed that the source of the Sun's energy could be: a. radioactive rocks b. a slow contraction c. meteorites falling in d. the annihilation of antimatter e. nuclear fusion Today we realize that the source of energy for the Sun is a process calle ...
Geology Chapter 24 – Studying the Sun
... and more inexpensively than refractors. Radio telescopes can "see" objects not viewable with visible light because of intervening interstellar dust. The Doppler shift of light is used to determine if objects are moving away or toward us. The sun can be divided into four layers: the interior, photosp ...
... and more inexpensively than refractors. Radio telescopes can "see" objects not viewable with visible light because of intervening interstellar dust. The Doppler shift of light is used to determine if objects are moving away or toward us. The sun can be divided into four layers: the interior, photosp ...
Sun
The Sun (in Greek: Helios, in Latin: Sol) is the star at the center of the Solar System and is by far the most important source of energy for life on Earth. It is a nearly perfect spherical ball of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process. Its diameter is about 109 times that of Earth, and it has a mass about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System.About three quarters of the Sun's mass consists of hydrogen; the rest is mostly helium, with much smaller quantities of heavier elements, including oxygen, carbon, neon and iron.The Sun is a G-type main-sequence star (G2V) based on spectral class and it is informally referred to as a yellow dwarf. It formed approximately 4.567 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became increasingly hot and dense, eventually initiating nuclear fusion in its core. It is thought that almost all stars form by this process. The Sun is roughly middle aged and has not changed dramatically for four billion years, and will remain fairly stable for another four billion years. However, after hydrogen fusion in its core has stopped, the Sun will undergo severe changes and become a red giant. It is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury, Venus, and possibly Earth.The enormous effect of the Sun on the Earth has been recognized since prehistoric times, and the Sun has been regarded by some cultures as a deity. Earth's movement around the Sun is the basis of the solar calendar, which is the predominant calendar in use today.