Professor Emeritus, University of Canterbury Yevgeny Lifshitz
... rotationally symmetric and time independent. This eliminates two out of the four coordinates in Einstein’s equations. • The equations where put into many elegant and beautiful forms (particularly by Papapetrou) but no rotating solution was found. ...
... rotationally symmetric and time independent. This eliminates two out of the four coordinates in Einstein’s equations. • The equations where put into many elegant and beautiful forms (particularly by Papapetrou) but no rotating solution was found. ...
Galaxy Far Far Away ppt
... the galaxy. HALO: Area surrounding galaxy that contains some scattered globular clusters. DISK: Contains most of the stars in the galaxy. ...
... the galaxy. HALO: Area surrounding galaxy that contains some scattered globular clusters. DISK: Contains most of the stars in the galaxy. ...
Lecture 15a - Sierra College Astronomy Home Page
... The problem with all these hypotheses (of aliens watching us quietly) is that galactic shear would move us to new stellar systems in a few million years; enforcement of a “DO-NOT-CONTACT-EARTHLINGS” rule would require cooperation at a galactic scale. In other words, if you think we are being quietly ...
... The problem with all these hypotheses (of aliens watching us quietly) is that galactic shear would move us to new stellar systems in a few million years; enforcement of a “DO-NOT-CONTACT-EARTHLINGS” rule would require cooperation at a galactic scale. In other words, if you think we are being quietly ...
Communication with Extraterrestrial Intelligence (CETI)
... with which we have long been familiar (Gold 1998). All these biological adaptations must inform our searches for life elsewhere in the universe. Mindful of the adaptability of life to extreme environments, we should reconsider our own solar system (where we may have some hope of systematic in situ s ...
... with which we have long been familiar (Gold 1998). All these biological adaptations must inform our searches for life elsewhere in the universe. Mindful of the adaptability of life to extreme environments, we should reconsider our own solar system (where we may have some hope of systematic in situ s ...
MSci Astrophysics 210PHY412 - Queen's University Belfast
... 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 ...
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 ...
Physics 127 Descriptive Astronomy Homework #20 Key
... Cepheids with his observed apparent magnitudes, yielding a distance for the Andromeda “Nebula” which put it far outside of our galaxy. ...
... Cepheids with his observed apparent magnitudes, yielding a distance for the Andromeda “Nebula” which put it far outside of our galaxy. ...
The Milky Way Galaxy
... • The Milky Way galaxy is home to 400 billion stars and our own Sun and Solar System. • It is a barred spiral galaxy. • Scientists think the centre of the galaxy contains a super massive black hole. • The Milky Way is full of dust, gas and stars. • The Milky Way, along with everything else, is ...
... • The Milky Way galaxy is home to 400 billion stars and our own Sun and Solar System. • It is a barred spiral galaxy. • Scientists think the centre of the galaxy contains a super massive black hole. • The Milky Way is full of dust, gas and stars. • The Milky Way, along with everything else, is ...
ISP 205: Visions of the Universe
... More detailed study of the Milky Way’s rotation reveals one of the greatest mysteries in astronomy… Most of Milky Way’s light comes from disk and bulge … ...
... More detailed study of the Milky Way’s rotation reveals one of the greatest mysteries in astronomy… Most of Milky Way’s light comes from disk and bulge … ...
How many planets are there in the galaxy?
... To be clear, the actual number of stars in the Milky Way is subject to some dispute. Essentially, astronomers are forced to make estimates due to the fact that we cannot view the Milky Way from the outside. And given that the Milky Way is in the shape of a barred, spiral disc, it is difficult for us ...
... To be clear, the actual number of stars in the Milky Way is subject to some dispute. Essentially, astronomers are forced to make estimates due to the fact that we cannot view the Milky Way from the outside. And given that the Milky Way is in the shape of a barred, spiral disc, it is difficult for us ...
Solutions - faculty.ucmerced.edu
... Plugging in the numbers gives v = 230 km/s (which shows that we were justified in assuming v small in our derivation). (b) The redshift is defined in terms of the scale factor as ...
... Plugging in the numbers gives v = 230 km/s (which shows that we were justified in assuming v small in our derivation). (b) The redshift is defined in terms of the scale factor as ...
AST1001.ch1
... More detailed study of the Milky Way’s rotation reveals one of the greatest mysteries in astronomy… Most of Milky Way’s light comes from disk and bulge … ...
... More detailed study of the Milky Way’s rotation reveals one of the greatest mysteries in astronomy… Most of Milky Way’s light comes from disk and bulge … ...
11.3 Measuring Distances in Space
... One light-year is the distance that light will travel in one year. It is 9 500 000 000 000 km or 9.5 trillion km. One light-year is about 63 000 AU. Distances to other stars and galaxies are measured in light-years. ...
... One light-year is the distance that light will travel in one year. It is 9 500 000 000 000 km or 9.5 trillion km. One light-year is about 63 000 AU. Distances to other stars and galaxies are measured in light-years. ...
here - Stargazers Club
... Video - Habitable Exoplanets - Scientists use Radial Velocity (the Wobble method) to find exoplanets Exoplanets are extra solar planets, planets outside our solar system Wobble method - an orbiting planet will pull on its star, causing it to wobble as it rotates. We can detect this wiggle in the lig ...
... Video - Habitable Exoplanets - Scientists use Radial Velocity (the Wobble method) to find exoplanets Exoplanets are extra solar planets, planets outside our solar system Wobble method - an orbiting planet will pull on its star, causing it to wobble as it rotates. We can detect this wiggle in the lig ...
Chapter 8 powerpoint presentation
... are strong only in the atmospheres of stars with temperatures ~ 104 K. (see previous figure on slide 17). ...
... are strong only in the atmospheres of stars with temperatures ~ 104 K. (see previous figure on slide 17). ...
galaxy_physics
... Disks are rotationally supported (dynamically cold) Bulges are dispersion supported (dynamically hot) Two extremes along a continuum Rotation asymmetric drift dispersion ...
... Disks are rotationally supported (dynamically cold) Bulges are dispersion supported (dynamically hot) Two extremes along a continuum Rotation asymmetric drift dispersion ...
Exam Review Sheet Physics Students should review all the
... 200 m of string was reeled in to return the kite back to the ground, what was the horizontal displacement of the kite? (Assume the kite string did not sag.) ___ 13. A hiker walks 4.0 km at an angle of 40° north of west. Then the hiker walks 4.0 km south. What is the magnitude and direction of the hi ...
... 200 m of string was reeled in to return the kite back to the ground, what was the horizontal displacement of the kite? (Assume the kite string did not sag.) ___ 13. A hiker walks 4.0 km at an angle of 40° north of west. Then the hiker walks 4.0 km south. What is the magnitude and direction of the hi ...
Homework Assignment 6 — Solutions
... Defining b ≡ 4.04 (T /1 K) e−158,000 K/T , we have the quadratic equation y 2 +by −b = 0, where y is the ionization fraction NII /Nt . When b 1, the quadratic term becomes negligible (remember, y must be between 0 and 1, so y 2 is also between 0 and 1), and the equation reduces to by − b ≈ 0, whic ...
... Defining b ≡ 4.04 (T /1 K) e−158,000 K/T , we have the quadratic equation y 2 +by −b = 0, where y is the ionization fraction NII /Nt . When b 1, the quadratic term becomes negligible (remember, y must be between 0 and 1, so y 2 is also between 0 and 1), and the equation reduces to by − b ≈ 0, whic ...
The search for extraterrestrial intelligence has mostly revolved
... infrared observations of the planet, we can separate the signature of the ETC from natural variations (due to geography) on the rotating planet’s surface. Unlike natural planetary heat sources (like volcanoes) and absorbers (like clouds), a civilization’s thermal footprint is likely to have a temper ...
... infrared observations of the planet, we can separate the signature of the ETC from natural variations (due to geography) on the rotating planet’s surface. Unlike natural planetary heat sources (like volcanoes) and absorbers (like clouds), a civilization’s thermal footprint is likely to have a temper ...
How to find ET with infrared light
... infrared observations of the planet, we can separate the signature of the ETC from natural variations (due to geography) on the rotating planet’s surface. Unlike natural planetary heat sources (like volcanoes) and absorbers (like clouds), a civilization’s thermal footprint is likely to have a temper ...
... infrared observations of the planet, we can separate the signature of the ETC from natural variations (due to geography) on the rotating planet’s surface. Unlike natural planetary heat sources (like volcanoes) and absorbers (like clouds), a civilization’s thermal footprint is likely to have a temper ...
1 UNIT 3 EARTH HISTORY - POSSIBLE TEST QUESTIONS OUR
... 20. Name and give the “type” for the largest known galaxy and estimated number of stars. 21. Are collisions of galaxies rare? How do we know? Grouping of Galaxies 22. Define a galaxy cluster. 23. What is an “Einstein cross” and what would cause this? 24. What is an “Einstein ring” and what would cau ...
... 20. Name and give the “type” for the largest known galaxy and estimated number of stars. 21. Are collisions of galaxies rare? How do we know? Grouping of Galaxies 22. Define a galaxy cluster. 23. What is an “Einstein cross” and what would cause this? 24. What is an “Einstein ring” and what would cau ...
Introduction to Galaxies and Cosmology Exercises 2
... 7. For every mass m which is swallowed by a black hole (via an accretion disk, say), an amount of energy νmc2 is liberated, where ν is the efficiency of the process. A value of ν = 0.1 is realistic. At what rate Ṁ would a supermassive black hole have to swallow mass to produce the luminosity L = 10 ...
... 7. For every mass m which is swallowed by a black hole (via an accretion disk, say), an amount of energy νmc2 is liberated, where ν is the efficiency of the process. A value of ν = 0.1 is realistic. At what rate Ṁ would a supermassive black hole have to swallow mass to produce the luminosity L = 10 ...
Homologous Expansion and Contraction Many problems in stellar
... while a positive value denotes a thermal runaway. As demonstrated above, if the gas conditions are degenerate, δ = 0, and again we have a runaway. However, suppose we are dealing with an ideal gas (which is the relevant condition, since the gas in the shell is outside the core). For core burning st ...
... while a positive value denotes a thermal runaway. As demonstrated above, if the gas conditions are degenerate, δ = 0, and again we have a runaway. However, suppose we are dealing with an ideal gas (which is the relevant condition, since the gas in the shell is outside the core). For core burning st ...