Energy Losses and Gravitational Radiation
... photons or other particles, or by interacting with a field and radiating. Let’s break it down. First, interaction with photons (inverse Compton scattering). Ask class: would they expect protons or electrons to lose more energy by scattering with photons? Electrons have a much larger cross section, s ...
... photons or other particles, or by interacting with a field and radiating. Let’s break it down. First, interaction with photons (inverse Compton scattering). Ask class: would they expect protons or electrons to lose more energy by scattering with photons? Electrons have a much larger cross section, s ...
Binary star formation
... • If Etotal < 0: stars are bound (don’t need to form a binary - we have one already!) • If Etotal > 0: stars are unbound and will remain so For one star to capture another and form a binary, need to somehow lose energy from the system. - into internal energy / fluid motion of the stars - give energy ...
... • If Etotal < 0: stars are bound (don’t need to form a binary - we have one already!) • If Etotal > 0: stars are unbound and will remain so For one star to capture another and form a binary, need to somehow lose energy from the system. - into internal energy / fluid motion of the stars - give energy ...
Chapter 15 Surveying the Stars
... • What is the significance of the main sequence? – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram – A star’s mass determines its position along the main sequence (high-mass: luminous and blue; low-mass: faint and red) ...
... • What is the significance of the main sequence? – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram – A star’s mass determines its position along the main sequence (high-mass: luminous and blue; low-mass: faint and red) ...
Lecture 15 (pdf from the powerpoint)
... collects at the center of the star • Gravity pulls the core of the star to a size smaller than the Earth’s diameter! • The core compresses so much that protons and electrons merge into neutrons, taking energy away from the core • The core collapses, and the layers above fall rapidly toward the cente ...
... collects at the center of the star • Gravity pulls the core of the star to a size smaller than the Earth’s diameter! • The core compresses so much that protons and electrons merge into neutrons, taking energy away from the core • The core collapses, and the layers above fall rapidly toward the cente ...
Introduction
... the ride, at which the coaster is released from rest. From this point on, the ride is “powered” solely by gravity. State the law of conservation of energy (3 marks), and use this to explain how numerous exchanges of potential and kinetic energy occur as the coaster descends and speeds up or ascends ...
... the ride, at which the coaster is released from rest. From this point on, the ride is “powered” solely by gravity. State the law of conservation of energy (3 marks), and use this to explain how numerous exchanges of potential and kinetic energy occur as the coaster descends and speeds up or ascends ...
Chapter 20 Stellar Evolution (20.1-20.3)
... 20.3 The Death of a Low-Mass Star This outline of stellar formation and extinction can be compared to observations of star clusters. Here a globular cluster: The “blue stragglers” in this H-R diagram are not exceptions to our model; they are stars that have formed much more recently, probably from ...
... 20.3 The Death of a Low-Mass Star This outline of stellar formation and extinction can be compared to observations of star clusters. Here a globular cluster: The “blue stragglers” in this H-R diagram are not exceptions to our model; they are stars that have formed much more recently, probably from ...
Star Formation - University of Redlands
... Gravity vs. Pressure • Stars and other interstellar material are in a perpetual battle between forces pulling in (gravity) and forces pushing out (pressure). • Gravity comes from the mass of the cloud or star. • Pressure comes from the motion of the atoms or molecules. – Think of hot air balloons. ...
... Gravity vs. Pressure • Stars and other interstellar material are in a perpetual battle between forces pulling in (gravity) and forces pushing out (pressure). • Gravity comes from the mass of the cloud or star. • Pressure comes from the motion of the atoms or molecules. – Think of hot air balloons. ...
Space The Life of a Star
... This is what makes a star begin to die. As the hydrogen in its core is changed to helium, the hydrogen begins to run out, like the gas in a car. At this point, the star is not making as much heat as it used to, so the core starts having trouble holding its shape, and it begins to get smaller. While ...
... This is what makes a star begin to die. As the hydrogen in its core is changed to helium, the hydrogen begins to run out, like the gas in a car. At this point, the star is not making as much heat as it used to, so the core starts having trouble holding its shape, and it begins to get smaller. While ...
AST101_lect_12
... All members have the same • Age • Distance from Earth • Composition A testing ground for theories of • Star formation • Stellar evolution ...
... All members have the same • Age • Distance from Earth • Composition A testing ground for theories of • Star formation • Stellar evolution ...
Weighing Earth, Sun, & Universe—20 Apr Weighing the Earth • Define a motion
... 3. A planet orbits a star at a radius of 1 AU. One orbit takes ½ of an earth year. The mass of the star is ___ the mass of the sun. ...
... 3. A planet orbits a star at a radius of 1 AU. One orbit takes ½ of an earth year. The mass of the star is ___ the mass of the sun. ...
Distant Stars Lesson Plan
... 1. Take a simple quiz. Print and distribute the quiz on page 4. Here are the answers: What is the one factor that determines a star’s color? Answer: b) Its temperature On the H-R Diagram, most stars fall on the diagonal line from the upper left hot blue stars to the lower right cool red stars. W ...
... 1. Take a simple quiz. Print and distribute the quiz on page 4. Here are the answers: What is the one factor that determines a star’s color? Answer: b) Its temperature On the H-R Diagram, most stars fall on the diagonal line from the upper left hot blue stars to the lower right cool red stars. W ...
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2-2 wkst - Home [www.petoskeyschools.org]
... a. A star begins its life as a ball of gas and dust. b. As stars get older, they lose some of their material. c. Stars last forever. d. New stars form from the material of old stars. 2. During a star’s life cycle, hydrogen changes to helium in a process called ____________________. 3.When a star die ...
... a. A star begins its life as a ball of gas and dust. b. As stars get older, they lose some of their material. c. Stars last forever. d. New stars form from the material of old stars. 2. During a star’s life cycle, hydrogen changes to helium in a process called ____________________. 3.When a star die ...
Week8Lecture1
... Finding the Galactic Center How to Find the Galactic Center 1) Locate globular clusters in the halo 2) Determine distances to globular clusters using variable stars in the clusters 3) Find center of globular cluster distribution; this is the Galactic center Our Sun is ~28,000 lt-yrs from the Galact ...
... Finding the Galactic Center How to Find the Galactic Center 1) Locate globular clusters in the halo 2) Determine distances to globular clusters using variable stars in the clusters 3) Find center of globular cluster distribution; this is the Galactic center Our Sun is ~28,000 lt-yrs from the Galact ...
Document
... The observation that there are few spiral galaxies in areas of high galaxy density. ...
... The observation that there are few spiral galaxies in areas of high galaxy density. ...
r - QUB Astrophysics Research Centre
... Heat is convected by rising elements which are hotter than their surroundings and falling elements which are cooler. Suppose the element differs by T from its surroundings, because an element is always in pressure balance with its surroundings, it has energy content per kg which differs from surrou ...
... Heat is convected by rising elements which are hotter than their surroundings and falling elements which are cooler. Suppose the element differs by T from its surroundings, because an element is always in pressure balance with its surroundings, it has energy content per kg which differs from surrou ...
The star is born
... These disks are made up of about 99% gas and 1% dust. Even this tiny percentage of dust is sufficient to make all the planets that we have in our solar system. The disks appear dark, because they are viewed against the bright background of the Orion nebula. The reddish glowing object in the middle ...
... These disks are made up of about 99% gas and 1% dust. Even this tiny percentage of dust is sufficient to make all the planets that we have in our solar system. The disks appear dark, because they are viewed against the bright background of the Orion nebula. The reddish glowing object in the middle ...
Astronomy 110 Announcements: How are the lives of stars with
... Neutron Star Limit • Quantum mechanics says that neutrons in the same place cannot be in the same state • Neutron degeneracy pressure can no longer support a neutron star against gravity if its mass exceeds about 3 Msun ...
... Neutron Star Limit • Quantum mechanics says that neutrons in the same place cannot be in the same state • Neutron degeneracy pressure can no longer support a neutron star against gravity if its mass exceeds about 3 Msun ...
How do we describe motion? - Department of Physics and Astronomy
... • The same laws are valid throughout the universe • The laws of motions are an essential part of our technological society. The design of spaceships, airplanes, and even cars and skyscrapers, based on Newton’s laws. • Using these laws, Astronomers can understand how structures evolve in space usin ...
... • The same laws are valid throughout the universe • The laws of motions are an essential part of our technological society. The design of spaceships, airplanes, and even cars and skyscrapers, based on Newton’s laws. • Using these laws, Astronomers can understand how structures evolve in space usin ...
Lecture 31: The Properties of Stars
... of stars. The color of a star depends on its temperature: cooler stars are redder, hotter stars are blue. Luminosity, the total energy output expressed in Watts or Solar Luminosities, depends on the radius and temperature. The absorption spectra of stars form a distinct sequence with stellar tempera ...
... of stars. The color of a star depends on its temperature: cooler stars are redder, hotter stars are blue. Luminosity, the total energy output expressed in Watts or Solar Luminosities, depends on the radius and temperature. The absorption spectra of stars form a distinct sequence with stellar tempera ...