Today`s Powerpoint
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
Chapter 11 - USD Home Pages
... 10,000 times as luminous as our sun will have a mass of about 10 M . Chap 12 will show that explains its short life of only 10 million years. b. A star with a mass of 10−1 M will have a luminosity of about 10−3 L . That’s why its life will be 1000 billion years. 44. What if? The Sun were a B-type ...
... 10,000 times as luminous as our sun will have a mass of about 10 M . Chap 12 will show that explains its short life of only 10 million years. b. A star with a mass of 10−1 M will have a luminosity of about 10−3 L . That’s why its life will be 1000 billion years. 44. What if? The Sun were a B-type ...
Test#3
... a) they rotate slowly, b) they are a few km in radius c) they have large magnetic fields, d) some of them are observed to be pulsars 28. Which of the following objects can rotate a thousand times per second without being torn apart? a) white dwarf, b) main sequence star, c) red giant, d) neutron sta ...
... a) they rotate slowly, b) they are a few km in radius c) they have large magnetic fields, d) some of them are observed to be pulsars 28. Which of the following objects can rotate a thousand times per second without being torn apart? a) white dwarf, b) main sequence star, c) red giant, d) neutron sta ...
Understanding Stars
... Absolute Magnitude and Luminosity • 2 different ways of measuring the same thing – like Celsius and Fahrenheit The H-R diagram • Hertzsprung and Russell graphed absolute magnitude vs. spectral type – Their graph became known as a Hertzsprung-Russell diagram, or H-R diagram – It is one of the most im ...
... Absolute Magnitude and Luminosity • 2 different ways of measuring the same thing – like Celsius and Fahrenheit The H-R diagram • Hertzsprung and Russell graphed absolute magnitude vs. spectral type – Their graph became known as a Hertzsprung-Russell diagram, or H-R diagram – It is one of the most im ...
Gravity Defied From Potato Asteroids to Magnetised Neutron Stars
... the collapse and subsequent fragmentation of these molecular clouds into star-sized clumps. We have seen earlier, how the condition for hydrostatic equilibrium depends on the temperature (T ) (responsible for the gas pressure) and the mass (M) of the gas1 . The gas cloud collapses if its temperature ...
... the collapse and subsequent fragmentation of these molecular clouds into star-sized clumps. We have seen earlier, how the condition for hydrostatic equilibrium depends on the temperature (T ) (responsible for the gas pressure) and the mass (M) of the gas1 . The gas cloud collapses if its temperature ...
30-3
... c. has no particular shape, may have a low total mass, and is fairly rich in dust and gas d. has a straight bar of stars that runs through the center ...
... c. has no particular shape, may have a low total mass, and is fairly rich in dust and gas d. has a straight bar of stars that runs through the center ...
Astronomy 110G Review Sheet for Exam #3 The
... behind. White dwarves are supported by their electrons being packed as closely together as possible and are about 100 times smaller than the Sun. Above about 1.44 solar masses gravity can “squeeze” the electrons into the protons to form neutrons. Resulting neutron stars (sometimes observed as pulsar ...
... behind. White dwarves are supported by their electrons being packed as closely together as possible and are about 100 times smaller than the Sun. Above about 1.44 solar masses gravity can “squeeze” the electrons into the protons to form neutrons. Resulting neutron stars (sometimes observed as pulsar ...
The Diversity and Unity of Life- A Paradox
... Some food for thought by the astrophysicist Carl Sagan “The dimensions of the Cosmos are so large that using familiar units of distance, such as meters or miles, chosen for their utility on Earth, would make little sense. Instead we measure distance with the speed of light. In one second a beam of l ...
... Some food for thought by the astrophysicist Carl Sagan “The dimensions of the Cosmos are so large that using familiar units of distance, such as meters or miles, chosen for their utility on Earth, would make little sense. Instead we measure distance with the speed of light. In one second a beam of l ...
Skywatch Astro Ed Dec13
... All stars consist mainly of hydrogen and helium, which were created in the Big Bang. But they also have a smattering of heavier elements. These elements were created in the hearts of other stars, then hurled into space as the stars died, where they could be incorporated into new stars. Population II ...
... All stars consist mainly of hydrogen and helium, which were created in the Big Bang. But they also have a smattering of heavier elements. These elements were created in the hearts of other stars, then hurled into space as the stars died, where they could be incorporated into new stars. Population II ...
Name
... 17. Explain the big bang theory in as much detail as possible. Make sure you answer the following questions: 1. Is the universe expanding or getting smaller? 2. What evidence did the WMAP provide scientists about the big bang? 3. Is the universe cooling or getting hotter? Less or more dense? 4. How ...
... 17. Explain the big bang theory in as much detail as possible. Make sure you answer the following questions: 1. Is the universe expanding or getting smaller? 2. What evidence did the WMAP provide scientists about the big bang? 3. Is the universe cooling or getting hotter? Less or more dense? 4. How ...
PH109 Exploring the Uiverse, Test #4, Spring, 1999
... 21. The heaviest elements on Earth were originally created by a) Volcanoes b) the big bang c) super novae d) black holes 22. The distribution of matter in a galaxy can be found by measuring a) the number of stars b) the rotation curve c) number of pulsars d) how thick a galaxy is 23. The growth of ...
... 21. The heaviest elements on Earth were originally created by a) Volcanoes b) the big bang c) super novae d) black holes 22. The distribution of matter in a galaxy can be found by measuring a) the number of stars b) the rotation curve c) number of pulsars d) how thick a galaxy is 23. The growth of ...
Patterns in the night sky - Laureate International College
... A star is a ball-shaped mass of superheated gases that produces and gives off light, heat, and other kinds of energy. Our Sun is a star. Stars vary in size, colour, temperature and density. ...
... A star is a ball-shaped mass of superheated gases that produces and gives off light, heat, and other kinds of energy. Our Sun is a star. Stars vary in size, colour, temperature and density. ...
Solar Furnaces
... (gravity pulling in is balanced by pressure pushing out). • Energy is lost from the surface, but nuclear reactions provide energy to prevent contraction. • But eventually a helium core builds up to 0.1Msun, and there isn’t enough hydrogen left in the core for appreciable ...
... (gravity pulling in is balanced by pressure pushing out). • Energy is lost from the surface, but nuclear reactions provide energy to prevent contraction. • But eventually a helium core builds up to 0.1Msun, and there isn’t enough hydrogen left in the core for appreciable ...
Today`s Powerpoint
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
The Life Cycle of a Star Webquest
... ______ The gas and dust compresses into a slowly rotating ball. ______ The gas ball begins to spin faster and cool. ______ A star begins to form from clouds of hydrogen gas and dust. ______ The ball separate into a core and spinning disks. 3. How long can a star stay a protostar? ___________________ ...
... ______ The gas and dust compresses into a slowly rotating ball. ______ The gas ball begins to spin faster and cool. ______ A star begins to form from clouds of hydrogen gas and dust. ______ The ball separate into a core and spinning disks. 3. How long can a star stay a protostar? ___________________ ...
Astronomy – The Milky Way Galaxy
... If you look at a galaxy that is 7 billion light years away you are seeing that galaxy as it appeared 7 billion years ago. ...
... If you look at a galaxy that is 7 billion light years away you are seeing that galaxy as it appeared 7 billion years ago. ...
Solutions to test #2 taken on Monday
... 2. (13) Millions, Billions or One. This is an “order of magnitude” question. Pick the number (the order of magnitude) that is closest for each. a) ___one_____ Average distance (in parsecs) between stars. b) ____billions____ Current age of the Sun in years. c) ___millions_____ Length of time a star l ...
... 2. (13) Millions, Billions or One. This is an “order of magnitude” question. Pick the number (the order of magnitude) that is closest for each. a) ___one_____ Average distance (in parsecs) between stars. b) ____billions____ Current age of the Sun in years. c) ___millions_____ Length of time a star l ...
Stellar Evolution - Harnett County High Schools Wiki
... Only innermost 10% of a star’s mass can undergo nuclear reactions because temperatures outside the core never get hot enough for nuclear reactions to occur When all the hydrogen in a star’s core is gone, star has a helium center and the outer layers have mostly hydrogen gas Some hydrogen will contin ...
... Only innermost 10% of a star’s mass can undergo nuclear reactions because temperatures outside the core never get hot enough for nuclear reactions to occur When all the hydrogen in a star’s core is gone, star has a helium center and the outer layers have mostly hydrogen gas Some hydrogen will contin ...
here
... (a) The Sun and Solar System lie about 1,000 light years from the center of the Milky Way galaxy. (b) The carbon, nitrogen, and oxygen present in the Sun and Earth were synthesized in nuclear fusion reactions in the Suns core. (c) Mature galaxies tend to look more straggly than infant galaxies. (d) ...
... (a) The Sun and Solar System lie about 1,000 light years from the center of the Milky Way galaxy. (b) The carbon, nitrogen, and oxygen present in the Sun and Earth were synthesized in nuclear fusion reactions in the Suns core. (c) Mature galaxies tend to look more straggly than infant galaxies. (d) ...
Astrophysics
... If galaxies are moving away from us, they must have been closer together millions of years ago. If Hubble’s graph is used, the origin of this movement = approx. 10 000 million years old ...
... If galaxies are moving away from us, they must have been closer together millions of years ago. If Hubble’s graph is used, the origin of this movement = approx. 10 000 million years old ...
Week 5 (10/16) – Quiz #11
... A. Wien’s law states that the temperature of a black body and the wavelength of peak radiation bear an inverse relation to each other B. The luminosity of a black body is proportional to its temperature raised to the fourth power C. Atoms are capable of absorbing and re-emitting photons D. The energ ...
... A. Wien’s law states that the temperature of a black body and the wavelength of peak radiation bear an inverse relation to each other B. The luminosity of a black body is proportional to its temperature raised to the fourth power C. Atoms are capable of absorbing and re-emitting photons D. The energ ...
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.