Supernova scrutiny: Astronomers look inside the heart of a dying
... These observations have helped astronomers rule out previous theories about how stars explode, but NuSTAR’s measurements have also raised further questions. The astronomers found that the map of titanium-44 recorded by the telescope does not match up with the map of iron created by other telescopes ...
... These observations have helped astronomers rule out previous theories about how stars explode, but NuSTAR’s measurements have also raised further questions. The astronomers found that the map of titanium-44 recorded by the telescope does not match up with the map of iron created by other telescopes ...
Stars and Space - science
... • Stars form out of clouds of dust and gas. • Particles gather under gravity to form a protostar. • The protostar becomes denser and hotter. If it reaches a point where hydrogen and other atoms fuse – huge amounts of energy (including light) are released and a star is born! AQA Science © Nelson Thor ...
... • Stars form out of clouds of dust and gas. • Particles gather under gravity to form a protostar. • The protostar becomes denser and hotter. If it reaches a point where hydrogen and other atoms fuse – huge amounts of energy (including light) are released and a star is born! AQA Science © Nelson Thor ...
Stellar energy - schoolphysics
... helium every second, producing a staggering output of 3.90x1020 MW - equivalent to some million million million large power stations! ...
... helium every second, producing a staggering output of 3.90x1020 MW - equivalent to some million million million large power stations! ...
Activity: Stellar Spectra
... 1. Explain how spectroscopic analysis enables us to determine what elements are present in a star. (K: 2 marks) 2. Does the spectroscopic analysis of a star tell us the composition of the entire star or just a part of it? (HINT: Stars are opaque). (T: 1 mark) 3. Astronomers focus on distant stars th ...
... 1. Explain how spectroscopic analysis enables us to determine what elements are present in a star. (K: 2 marks) 2. Does the spectroscopic analysis of a star tell us the composition of the entire star or just a part of it? (HINT: Stars are opaque). (T: 1 mark) 3. Astronomers focus on distant stars th ...
Where Do Chemical Elements Come From?
... both which elements and how much of each element was produced over time. The net result is that most scientists accepted the idea that some elements were created during Big Bang (big bang nucleosynthesis) and that many elements continued to be created by stellar nucleosynthesis. B2FH were able to id ...
... both which elements and how much of each element was produced over time. The net result is that most scientists accepted the idea that some elements were created during Big Bang (big bang nucleosynthesis) and that many elements continued to be created by stellar nucleosynthesis. B2FH were able to id ...
Variation of Elements in Nature
... speculated that this fire ball exploded and started expanding about 15 billion years ago. The fire ball was mainly made up of hydrogen and, during the initial expansion, nuclear reactions could have produced helium from hydrogen. Heavier elements could have also been produced in smaller quantities. ...
... speculated that this fire ball exploded and started expanding about 15 billion years ago. The fire ball was mainly made up of hydrogen and, during the initial expansion, nuclear reactions could have produced helium from hydrogen. Heavier elements could have also been produced in smaller quantities. ...
2.1c Notes - Vanderbilt University
... Nature’s signatures for the existence of shell structure in very neutron-rich nuclei. In particular, the theoretically predicted “quenching” of the shell structure near the neutron dripline (see slide 7 in section 2.1c) can have a dramatic effect on calculated abundances. The origin of the r-process ...
... Nature’s signatures for the existence of shell structure in very neutron-rich nuclei. In particular, the theoretically predicted “quenching” of the shell structure near the neutron dripline (see slide 7 in section 2.1c) can have a dramatic effect on calculated abundances. The origin of the r-process ...
La teoria del big bang y la formacion del Universo
... billion years ago, which is thus considered the age of the universe. • After the initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles, including protons, neutrons, and electrons. Though simple atomic nuclei formed within the first three minutes after the ...
... billion years ago, which is thus considered the age of the universe. • After the initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles, including protons, neutrons, and electrons. Though simple atomic nuclei formed within the first three minutes after the ...
Stellar Fusion
... together (mostly H being fused to form He). 5. Other element fusion? Yes, eventually helium, carbon, neon, magnesium and silicon can form. All of the naturally occurring elements in the universe are created by fusion reactions in stars. ...
... together (mostly H being fused to form He). 5. Other element fusion? Yes, eventually helium, carbon, neon, magnesium and silicon can form. All of the naturally occurring elements in the universe are created by fusion reactions in stars. ...
August 29 - Astronomy
... The explosion of the outer layers is so violent that all the elements heavier than iron can be produced, including many unstable radioactive isotopes. ...
... The explosion of the outer layers is so violent that all the elements heavier than iron can be produced, including many unstable radioactive isotopes. ...
Evolution of High
... If the stars were born from the primordial interstellar medium of only hydrogen and helium, then, where are carbon, nitrogen, and oxygen coming from for CNO cycle to work? • First generation high-mass main-sequence stars would not have carbon, nitrogen, and oxygen for CNO cycle to work efficiently ...
... If the stars were born from the primordial interstellar medium of only hydrogen and helium, then, where are carbon, nitrogen, and oxygen coming from for CNO cycle to work? • First generation high-mass main-sequence stars would not have carbon, nitrogen, and oxygen for CNO cycle to work efficiently ...
PASS Content Standard 5.1
... The universal abundance of the chemical elements is one of five fundamental pieces of evidence supporting the cosmological model of the Big Bang Theory. ...
... The universal abundance of the chemical elements is one of five fundamental pieces of evidence supporting the cosmological model of the Big Bang Theory. ...
Stella Finger Prints
... and dust where stars are born and sometimes die. They are mainly made up of hydrogen, helium, and other gases and dust. These elements are the key ingredients in making stars. All stars are first born of mostly hydrogen, the simplest form of matter in space. Throughout their life, stars convert more ...
... and dust where stars are born and sometimes die. They are mainly made up of hydrogen, helium, and other gases and dust. These elements are the key ingredients in making stars. All stars are first born of mostly hydrogen, the simplest form of matter in space. Throughout their life, stars convert more ...
Stars
... Three types of galaxies--all have billions of stars. Spiral Galaxy Our Milky Way is one. Has bulge at center and spiral arms. Our Sun is close to the edge of galaxy. ...
... Three types of galaxies--all have billions of stars. Spiral Galaxy Our Milky Way is one. Has bulge at center and spiral arms. Our Sun is close to the edge of galaxy. ...
Slide 1
... 21.3 Supernovae (Don’t Write) The velocities of the material in the Crab nebula can be extrapolated back, using Doppler shifts, to the original explosion. ...
... 21.3 Supernovae (Don’t Write) The velocities of the material in the Crab nebula can be extrapolated back, using Doppler shifts, to the original explosion. ...
talk
... However ... more than 60 of the elements arise from neutron capture processes. Say only 30 of these elements were detectable and we could measure only two distinct abundance levels for each. That would already give more than 109 independent cells in the chemical abundance space (if many of the eleme ...
... However ... more than 60 of the elements arise from neutron capture processes. Say only 30 of these elements were detectable and we could measure only two distinct abundance levels for each. That would already give more than 109 independent cells in the chemical abundance space (if many of the eleme ...
Unit 8 Astronomy
... A neutron star is an imploded core of an exploded star made up almost entirely of neutrons. A teaspoon of their material would weigh more than all of automobiles in the U.S. together The most massive stars become supernovae and die as: ______________________ BLACK HOLE A black hole is an extremely m ...
... A neutron star is an imploded core of an exploded star made up almost entirely of neutrons. A teaspoon of their material would weigh more than all of automobiles in the U.S. together The most massive stars become supernovae and die as: ______________________ BLACK HOLE A black hole is an extremely m ...
Earth Science 25.2B : Stellar Evolution
... the least massive. The explanation for this is that the more massive the star, the greater the gravitational force acting on it. With greater gravity, it is able to contract itself collapsing into a smaller more densely packed object than a star with less size. ...
... the least massive. The explanation for this is that the more massive the star, the greater the gravitational force acting on it. With greater gravity, it is able to contract itself collapsing into a smaller more densely packed object than a star with less size. ...
Document
... • All Type 1a supernova have similar peak luminosities, and so can be used to measure the distance to the clusters or galaxies that contain them. ...
... • All Type 1a supernova have similar peak luminosities, and so can be used to measure the distance to the clusters or galaxies that contain them. ...
Slayt 1
... particles goes up and the protons get closer before repelling one another. If the proton get very close, the short-range nuclear force fuses them together. ...
... particles goes up and the protons get closer before repelling one another. If the proton get very close, the short-range nuclear force fuses them together. ...
VLA 90 cm Brogan et al. (2006)
... • 4 H atoms = 6.693x10-27 kg • 1 He atom = 6.645x10-27 kg Difference= 0.048x10-27 kg, converted to energy E=mc2 • All stars produce energy by nuclear fusion of hydrogen into helium • The sun isn’t hot enough to fuse heavier elements ...
... • 4 H atoms = 6.693x10-27 kg • 1 He atom = 6.645x10-27 kg Difference= 0.048x10-27 kg, converted to energy E=mc2 • All stars produce energy by nuclear fusion of hydrogen into helium • The sun isn’t hot enough to fuse heavier elements ...
Correct Answers with Comments
... 9. Oxygen in the atmosphere is a result of an imbalance of its geological sources and sinks. Oxygen sources are … burial of organic matter in sediments escape of hydrogen to space burial of Fe2O3 in sediments burial of FeS2 in sediments 3 pts; it helps to actually read the reading assignments … 10. ...
... 9. Oxygen in the atmosphere is a result of an imbalance of its geological sources and sinks. Oxygen sources are … burial of organic matter in sediments escape of hydrogen to space burial of Fe2O3 in sediments burial of FeS2 in sediments 3 pts; it helps to actually read the reading assignments … 10. ...
No Slide Title - steadyserverpages.com
... our sun) becomes what at the very end of its life? a) Black hole b) Neutron star c) White dwarf d) Pulsar e) Red giant ...
... our sun) becomes what at the very end of its life? a) Black hole b) Neutron star c) White dwarf d) Pulsar e) Red giant ...
Nucleosynthesis
Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons, primarily protons and neutrons. The first nuclei were formed about three minutes after the Big Bang, through the process called Big Bang nucleosynthesis. It was then that hydrogen and helium formed to become the content of the first stars, and this primeval process is responsible for the present hydrogen/helium ratio of the cosmos.With the formation of stars, heavier nuclei were created from hydrogen and helium by stellar nucleosynthesis, a process that continues today. Some of these elements, particularly those lighter than iron, continue to be delivered to the interstellar medium when low mass stars eject their outer envelope before they collapse to form white dwarfs. The remains of their ejected mass form the planetary nebulae observable throughout our galaxy.Supernova nucleosynthesis within exploding stars by fusing carbon and oxygen is responsible for the abundances of elements between magnesium (atomic number 12) and nickel (atomic number 28). Supernova nucleosynthesis is also thought to be responsible for the creation of rarer elements heavier than iron and nickel, in the last few seconds of a type II supernova event. The synthesis of these heavier elements absorbs energy (endothermic) as they are created, from the energy produced during the supernova explosion. Some of those elements are created from the absorption of multiple neutrons (the R process) in the period of a few seconds during the explosion. The elements formed in supernovas include the heaviest elements known, such as the long-lived elements uranium and thorium.Cosmic ray spallation, caused when cosmic rays impact the interstellar medium and fragment larger atomic species, is a significant source of the lighter nuclei, particularly 3He, 9Be and 10,11B, that are not created by stellar nucleosynthesis.In addition to the fusion processes responsible for the growing abundances of elements in the universe, a few minor natural processes continue to produce very small numbers of new nuclides on Earth. These nuclides contribute little to their abundances, but may account for the presence of specific new nuclei. These nuclides are produced via radiogenesis (decay) of long-lived, heavy, primordial radionuclides such as uranium and thorium. Cosmic ray bombardment of elements on Earth also contribute to the presence of rare, short-lived atomic species called cosmogenic nuclides.