spiral galaxies
... 5 trillion stars! There is very little free gas in an elliptical galaxy. Therefore, few new stars form there. IRREGULAR GALAXIES An irregular galaxy has no clear shape. It may have as few as 10 million or as many as several billion stars. Some irregular galaxies form when two other galaxies collide. ...
... 5 trillion stars! There is very little free gas in an elliptical galaxy. Therefore, few new stars form there. IRREGULAR GALAXIES An irregular galaxy has no clear shape. It may have as few as 10 million or as many as several billion stars. Some irregular galaxies form when two other galaxies collide. ...
Document
... Betelgeuse has a very high luminosity (40,000 times as bright as our Sun), but its surface is cool (below 4000 K). Which of the following explains this? a. ...
... Betelgeuse has a very high luminosity (40,000 times as bright as our Sun), but its surface is cool (below 4000 K). Which of the following explains this? a. ...
Active Galactic Nuclei: are they important?
... AGN? •Active Galactic Nuclei are fantastic subject for somebody who likes to apply GR •They consist of a massive black hole surrounded by plentiful material flowing in and out •This material emits radiation so we can trace what is happening close to a black hole ...
... AGN? •Active Galactic Nuclei are fantastic subject for somebody who likes to apply GR •They consist of a massive black hole surrounded by plentiful material flowing in and out •This material emits radiation so we can trace what is happening close to a black hole ...
Friday, April 11
... How do we know the Sun’s Mass? • Fairly easy calculation using Newton law of universal gravity • Need to know distance Earth-Sun • General idea: the faster the Earth goes around the Sun, the more gravitational pull the more massive the Sun • Earth takes 1 year to travel 2π (93 million miles) Su ...
... How do we know the Sun’s Mass? • Fairly easy calculation using Newton law of universal gravity • Need to know distance Earth-Sun • General idea: the faster the Earth goes around the Sun, the more gravitational pull the more massive the Sun • Earth takes 1 year to travel 2π (93 million miles) Su ...
SPECIAL REPORT
... million years or more to form a gas giant. Yet, observations of young stars suggest a disk’s gas disappears in a few million years or less. The core-accretion method may be too slow a process to form gas-giant planets in large numbers. On the other hand, disk instability is fast enough to form a gas ...
... million years or more to form a gas giant. Yet, observations of young stars suggest a disk’s gas disappears in a few million years or less. The core-accretion method may be too slow a process to form gas-giant planets in large numbers. On the other hand, disk instability is fast enough to form a gas ...
Making Heavier Metals
... The production of elements heavier than Iron takes place by adding neutrons to the atomic nuclei. These neutral particles do not feel any electrical repulsion from the charged nuclei. They can therefore easily approach them and thereby create heavier nuclei. This is indeed the way the heaviest chemi ...
... The production of elements heavier than Iron takes place by adding neutrons to the atomic nuclei. These neutral particles do not feel any electrical repulsion from the charged nuclei. They can therefore easily approach them and thereby create heavier nuclei. This is indeed the way the heaviest chemi ...
Rotation Curve Laboratory
... 15) Two students are debating their answers to the previous questions: Student 1: Stars far from the center of the Milky Way are all moving at about the same speed. If most of the Milky Way's mass was located in its center, then stars far away from the center would orbit slower than stars closer to ...
... 15) Two students are debating their answers to the previous questions: Student 1: Stars far from the center of the Milky Way are all moving at about the same speed. If most of the Milky Way's mass was located in its center, then stars far away from the center would orbit slower than stars closer to ...
Lecture18
... The relationship between period and luminosity was discovered by Henrietta Leavit in 1908 Leavit found that the brighter cepheids always had longer periods These cepheids were all in the Large Magellanic Cloud and so were all about the same distance ...
... The relationship between period and luminosity was discovered by Henrietta Leavit in 1908 Leavit found that the brighter cepheids always had longer periods These cepheids were all in the Large Magellanic Cloud and so were all about the same distance ...
Untitled
... began converting hydrogen into helium. However, due to a shortage of neutrons, the stars used a different process, called the proton-proton chain. During the big bang the young universe contained lots of neutrons. However, free neutrons (outside a nucleus) live an average of only 16 min. Millions of ...
... began converting hydrogen into helium. However, due to a shortage of neutrons, the stars used a different process, called the proton-proton chain. During the big bang the young universe contained lots of neutrons. However, free neutrons (outside a nucleus) live an average of only 16 min. Millions of ...
CHP 13
... a. they do not contain helium. b. they rotate too slowly. c. they cannot heat their centers hot enough. d. they contain strong magnetic fields. e. they never use up their hydrogen. 2. A planetary nebula is a. the expelled outer envelope of a medium mass star. b. produced by a supernova explosion. c. ...
... a. they do not contain helium. b. they rotate too slowly. c. they cannot heat their centers hot enough. d. they contain strong magnetic fields. e. they never use up their hydrogen. 2. A planetary nebula is a. the expelled outer envelope of a medium mass star. b. produced by a supernova explosion. c. ...
Giant planets in debris disks around nearby stars
... [4, 3] and comparing the expected star – planet contrasts to the contrast curve derived by [14] for NaCo-AGPMPCA-ADI for a ≈6 mag star under moderate weather conditions (applying a simplified scaling to tint = 2.5 hrs and ∆PA=90deg). Figure 4 shows that we will be sensitive to 5 MJup -mass planets a ...
... [4, 3] and comparing the expected star – planet contrasts to the contrast curve derived by [14] for NaCo-AGPMPCA-ADI for a ≈6 mag star under moderate weather conditions (applying a simplified scaling to tint = 2.5 hrs and ∆PA=90deg). Figure 4 shows that we will be sensitive to 5 MJup -mass planets a ...
Opakování z minulého cvičení
... incoming light into its rainbow pattern - a technique which goes right back to Isaac Newton's discovery that light can be split into its component colours in this way. The spectrum can then be photographed and studied in detail. The positions and strengths of the lines in the spectrum can also be de ...
... incoming light into its rainbow pattern - a technique which goes right back to Isaac Newton's discovery that light can be split into its component colours in this way. The spectrum can then be photographed and studied in detail. The positions and strengths of the lines in the spectrum can also be de ...
A Proposed Explanation of Dark Matter within General
... interpreted as dark matter in the standard model that is because according to the field equation (1) when an astronomical object is found in such a space its geometrical ( gravitational) affects will increase ( more than its effect if it were embedded in a space of zero or positive density ) . Both ...
... interpreted as dark matter in the standard model that is because according to the field equation (1) when an astronomical object is found in such a space its geometrical ( gravitational) affects will increase ( more than its effect if it were embedded in a space of zero or positive density ) . Both ...
PHYS3380_111115_bw - The University of Texas at Dallas
... - required some revisions to models of high mass stellar evolution, which had suggested that supernovae would result from red supergiants. Now believe star was chemically poor in elements heavier than He - contracted and heated up after phase as cool, red supergiant during which it lost much of its ...
... - required some revisions to models of high mass stellar evolution, which had suggested that supernovae would result from red supergiants. Now believe star was chemically poor in elements heavier than He - contracted and heated up after phase as cool, red supergiant during which it lost much of its ...
Quiz # 5 – 11/15/2011
... 9. The most important characteristic of a star for determining its lifetime is A. radius B. luminosity C. distance from the main sequence D. mass E. temperature 10. If the Sun were to suddenly become a black hole, its radius would shrink by 200,000 times. The gravitational force felt by the Earth at ...
... 9. The most important characteristic of a star for determining its lifetime is A. radius B. luminosity C. distance from the main sequence D. mass E. temperature 10. If the Sun were to suddenly become a black hole, its radius would shrink by 200,000 times. The gravitational force felt by the Earth at ...
Major constellations
... Ursa major is the third largest constellation in the night sky. It is widely known for containing the plough sometimes known as the big dipper. It has declination 50 degrees and right ascension 11 hours. It contains 16 stars, 5 galaxies,1 binary star and a planetary Nebula. According to some Native ...
... Ursa major is the third largest constellation in the night sky. It is widely known for containing the plough sometimes known as the big dipper. It has declination 50 degrees and right ascension 11 hours. It contains 16 stars, 5 galaxies,1 binary star and a planetary Nebula. According to some Native ...
Chapter 15: The Milky Way Galaxy
... How many stars does the Milky Way Galaxy contain? The Milky Way has about 200 billion stars. Where is our solar system located in the Milky Way Galaxy? The solar system is between the Sagittarius and Perseus spiral arms about 26,000 ly from the center of the Galaxy. Is the Sun moving through the Mil ...
... How many stars does the Milky Way Galaxy contain? The Milky Way has about 200 billion stars. Where is our solar system located in the Milky Way Galaxy? The solar system is between the Sagittarius and Perseus spiral arms about 26,000 ly from the center of the Galaxy. Is the Sun moving through the Mil ...
Topic 3 Assignment - Science 9 Portfolio
... The significance of the spectral lines was discovered about 50 years later when Kirschoff and Bunsen, two chemists used a spectroscope to observe various chemicals when they were heated. They found some of the lines missing in some of the chemicals. Each particular element had its own unique spectra ...
... The significance of the spectral lines was discovered about 50 years later when Kirschoff and Bunsen, two chemists used a spectroscope to observe various chemicals when they were heated. They found some of the lines missing in some of the chemicals. Each particular element had its own unique spectra ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.