Sample pages 2 PDF
... generation. Also, we have restricted attention to second generation stars with lifetimes of order 1010 year. Less massive stars than the sun will live longer and more massive ones will have shorter lives. There are reasons associated with need for a habitable climate to restrict attention to the sta ...
... generation. Also, we have restricted attention to second generation stars with lifetimes of order 1010 year. Less massive stars than the sun will live longer and more massive ones will have shorter lives. There are reasons associated with need for a habitable climate to restrict attention to the sta ...
Foundation 1 - Discovering Astronomy
... continues to contract and eventually becomes hot enough (100 million Kelvin) for helium to begin to fuse into carbon and oxygen – core helium fusion – 3 He C + energy and C + He O + energy ...
... continues to contract and eventually becomes hot enough (100 million Kelvin) for helium to begin to fuse into carbon and oxygen – core helium fusion – 3 He C + energy and C + He O + energy ...
Universe and Galaxy Short Study Guide
... instead grew on a diet of gas and stars controlled by their host galaxies in the beginning years of the universe. An initial look at 30 galaxies indicates that black holes do not precede a galaxy’s birth, but instead evolve with the galaxy by trapping an amazingly exact percentage (0.2) of the mass ...
... instead grew on a diet of gas and stars controlled by their host galaxies in the beginning years of the universe. An initial look at 30 galaxies indicates that black holes do not precede a galaxy’s birth, but instead evolve with the galaxy by trapping an amazingly exact percentage (0.2) of the mass ...
Space Study Guide
... was not for gravity, planets and stars would not have been able to form. Gravity is responsible for holding things in orbit around each other. It is responsible for holding the moon in orbit around the Earth, holding artificial satellites in orbit around the Earth The Earth in orbit around the sun ( ...
... was not for gravity, planets and stars would not have been able to form. Gravity is responsible for holding things in orbit around each other. It is responsible for holding the moon in orbit around the Earth, holding artificial satellites in orbit around the Earth The Earth in orbit around the sun ( ...
Stars
... 1. Begin their lives as clouds of dust and gas called nebulae 2. Gravity may cause the nebula to contract 3. Matter in the gas cloud will begin to condense into a dense region called a protostar 4. Protostar continues to condense, it heats up ...
... 1. Begin their lives as clouds of dust and gas called nebulae 2. Gravity may cause the nebula to contract 3. Matter in the gas cloud will begin to condense into a dense region called a protostar 4. Protostar continues to condense, it heats up ...
Introduction to Accretion Phenomena in Astrophysics
... • If a white dwarf has a companion star that overflows its Roche lobe, it steadily accrete gases by its intense gravity, compressed and heated to very high temperatures. • Hydrogen fusion can occur on the surface, the enormous amount of energy is liberated. The remaining gases blown away from the wh ...
... • If a white dwarf has a companion star that overflows its Roche lobe, it steadily accrete gases by its intense gravity, compressed and heated to very high temperatures. • Hydrogen fusion can occur on the surface, the enormous amount of energy is liberated. The remaining gases blown away from the wh ...
Synthetic color-magnitude diagrams: the ingredients
... The SFR and AMR are not independent, given that each generation of stars will inject in the interstellar medium – through SNe and mass-loss processes along the AGB and RGB stages – large quantities of gas chemically enriched by nuclear processes. ...
... The SFR and AMR are not independent, given that each generation of stars will inject in the interstellar medium – through SNe and mass-loss processes along the AGB and RGB stages – large quantities of gas chemically enriched by nuclear processes. ...
ASTR-1020: Astronomy II Course Lecture Notes - Faculty
... If stellar mass objects greater than 50 M do survive gravitational instabilities during birth, these objects would collapse very rapidly from protostar state and burn their thermonuclear fuel so quickly (i.e., within 10 million years) that few of these objects would be seen. When these hypermassive ...
... If stellar mass objects greater than 50 M do survive gravitational instabilities during birth, these objects would collapse very rapidly from protostar state and burn their thermonuclear fuel so quickly (i.e., within 10 million years) that few of these objects would be seen. When these hypermassive ...
Light Years Away
... 5. The Oort cloud is located A. Between the orbit of Mars and Jupiter B. On the outer rim of our solar system C. Within the atmosphere of Neptune D. Within the Andromeda Galaxy ...
... 5. The Oort cloud is located A. Between the orbit of Mars and Jupiter B. On the outer rim of our solar system C. Within the atmosphere of Neptune D. Within the Andromeda Galaxy ...
upperMS - CWRU Astronomy
... 60% of a star over 15% of its main sequence lifetime If 40% of the remaining mass can be removed in the final 85% of the lifetime, then it’s a nitrogen rich star It’s ok to lose this much mass and still be OB, but if it loses much more, then its luminosity will be too low Often present in young clus ...
... 60% of a star over 15% of its main sequence lifetime If 40% of the remaining mass can be removed in the final 85% of the lifetime, then it’s a nitrogen rich star It’s ok to lose this much mass and still be OB, but if it loses much more, then its luminosity will be too low Often present in young clus ...
Ch 20 Notes Stars
... • The outer layers of dust and gas expand, and the star swells to a Red Giant – a large reddish star in its late life cycle ...
... • The outer layers of dust and gas expand, and the star swells to a Red Giant – a large reddish star in its late life cycle ...
Chapter 14 Origins
... 10. What generalisation can be made about the masses of the stars in the main sequence? 11. Copy the following table, then complete it by writing a short description of the nuclear reaction occurring at each location indicated. 12. Draw an H–R diagram and indicate on it the main star groups. On this ...
... 10. What generalisation can be made about the masses of the stars in the main sequence? 11. Copy the following table, then complete it by writing a short description of the nuclear reaction occurring at each location indicated. 12. Draw an H–R diagram and indicate on it the main star groups. On this ...
Lecture (Powerpoint)
... Collapse will usually happen in many places throughout the cloud at the same time This is why stars tend to be clustered Amount of stars depends on size of gas cloud producing stars ...
... Collapse will usually happen in many places throughout the cloud at the same time This is why stars tend to be clustered Amount of stars depends on size of gas cloud producing stars ...
1 - Quia
... d. mass. 6. An astronomer observes four stars, each of which is a different color. Of these stars, the ____________ star is the hottest. a. red c. yellow b. blue d. green 7. In stars, energy is produced primarily as hydrogen atoms are combined to form a. helium atoms. c. oxygen atoms. b. carbon atom ...
... d. mass. 6. An astronomer observes four stars, each of which is a different color. Of these stars, the ____________ star is the hottest. a. red c. yellow b. blue d. green 7. In stars, energy is produced primarily as hydrogen atoms are combined to form a. helium atoms. c. oxygen atoms. b. carbon atom ...
LESSON 4, STARS
... becomes a protostar, a main-sequence star, a red giant, and finally, a white dwarf. A more-massive star: begins as a nebula, becomes a protostar, a main-sequence star, a very massive star, a supergiant, a supernova, and finally, either a neutron star (pulsar) or a ...
... becomes a protostar, a main-sequence star, a red giant, and finally, a white dwarf. A more-massive star: begins as a nebula, becomes a protostar, a main-sequence star, a very massive star, a supergiant, a supernova, and finally, either a neutron star (pulsar) or a ...
Stellar evolution, II
... form heavier atoms would use up more energy than they would produce. The outer layers squeeze down onto the iron core and the star explodes as a Type II supernova. ...
... form heavier atoms would use up more energy than they would produce. The outer layers squeeze down onto the iron core and the star explodes as a Type II supernova. ...
Extraterrestrial Life
... orbits close to the same plane orbits in same direction as Sun’s rotation rotation in the same direction (except Venus and Uranus) planets evenly spaced, increased by a factor of 1.5 to 2 planets sizes and compositions change with distance: terrestrial planets are rocky (iron and silicates) and gas ...
... orbits close to the same plane orbits in same direction as Sun’s rotation rotation in the same direction (except Venus and Uranus) planets evenly spaced, increased by a factor of 1.5 to 2 planets sizes and compositions change with distance: terrestrial planets are rocky (iron and silicates) and gas ...
_____ 1. Which of the following statements is NOT true about stars
... to change once the hydrogen begins to run out. 10. The red giants stage begins after the ___________________________ stage of a star. In this 3rd stage a red giant will _____________________ and ___________________ once it has used up all of its hydrogen. The center of the star will ________________ ...
... to change once the hydrogen begins to run out. 10. The red giants stage begins after the ___________________________ stage of a star. In this 3rd stage a red giant will _____________________ and ___________________ once it has used up all of its hydrogen. The center of the star will ________________ ...
File
... As you learned before, a large-mass star lives a much shorter life. They also end their life in a much more spectacular fashion. After the red-giant stage, the massive star has two forces acting upon it. The outward push caused by the hot core, and the inward pull of gravity. When the star’s fuel is ...
... As you learned before, a large-mass star lives a much shorter life. They also end their life in a much more spectacular fashion. After the red-giant stage, the massive star has two forces acting upon it. The outward push caused by the hot core, and the inward pull of gravity. When the star’s fuel is ...
File - greenscapes4you
... What do we now know about stars? All stars form in a cloud of dust and gas called a nebula. They begin their life with roughly the same composition. Star’s mass at birth: about 75% hydrogen about 25% helium; less than 2% heavier elements During most of star’s life, rate at which it generates energy ...
... What do we now know about stars? All stars form in a cloud of dust and gas called a nebula. They begin their life with roughly the same composition. Star’s mass at birth: about 75% hydrogen about 25% helium; less than 2% heavier elements During most of star’s life, rate at which it generates energy ...
SAMPLE TEST: Stars and Galaxies Multiple Choice Identify the letter
... ____ 21. A star is said to be born when ____. a. a protostar reaches a temperature high enough for nuclear fusion to begin b. a red giant collapses on itself and becomes a black hole c. pressure within a protostar becomes so great that a supernova occurs d. a dark, cool interstellar cloud begins to ...
... ____ 21. A star is said to be born when ____. a. a protostar reaches a temperature high enough for nuclear fusion to begin b. a red giant collapses on itself and becomes a black hole c. pressure within a protostar becomes so great that a supernova occurs d. a dark, cool interstellar cloud begins to ...
File
... The main characteristics used to classify stars include all of the following EXCEPT: a. shape. b. brightness. c. color. d. temperature. ...
... The main characteristics used to classify stars include all of the following EXCEPT: a. shape. b. brightness. c. color. d. temperature. ...
Document
... center of the Milky Way, the mass of the central black hole could be determined to ~ 2.6 million solar masses ...
... center of the Milky Way, the mass of the central black hole could be determined to ~ 2.6 million solar masses ...
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.