educator guide - Michigan Science Center
... the core, and the dense helium core compresses the nearby layers. This causes the layers near the core to begin fusing hydrogen into helium again, but at a faster rate than before. The helium being created continues to be deposited into the core and the rate of hydrogen fusion will continue to speed ...
... the core, and the dense helium core compresses the nearby layers. This causes the layers near the core to begin fusing hydrogen into helium again, but at a faster rate than before. The helium being created continues to be deposited into the core and the rate of hydrogen fusion will continue to speed ...
Document
... • There are two types of dynamic tides: • 1) the ones appropriate for highly eccentric orbits • (DT in the sense of Press and Teukolsky). During periastron passage normal modes of planet and stellar pulsations are exited. These are: fundamental modes with frequencies ~ *, g-modes in case of the pre ...
... • There are two types of dynamic tides: • 1) the ones appropriate for highly eccentric orbits • (DT in the sense of Press and Teukolsky). During periastron passage normal modes of planet and stellar pulsations are exited. These are: fundamental modes with frequencies ~ *, g-modes in case of the pre ...
Modern Physics Exam
... (a) if the frequency = (energy difference between 2 levels)/h. (b) of any frequency. (c) of any frequency > (the smallest energy difference between 2 levels)/h. (d) in integer multiples of h. [19] Which of the following is not a valid quantum relation? (a) E = hf (b) p = h/λ (c) L = n ħ ...
... (a) if the frequency = (energy difference between 2 levels)/h. (b) of any frequency. (c) of any frequency > (the smallest energy difference between 2 levels)/h. (d) in integer multiples of h. [19] Which of the following is not a valid quantum relation? (a) E = hf (b) p = h/λ (c) L = n ħ ...
Variable Star Observation
... Eclipsing binary and rotating stars • Eclipsing binary and rotating stars are the two classes of stars within the extrinsic group. • A binary star is a stellar system consisting of two stars orbiting around their center of mass. ...
... Eclipsing binary and rotating stars • Eclipsing binary and rotating stars are the two classes of stars within the extrinsic group. • A binary star is a stellar system consisting of two stars orbiting around their center of mass. ...
The Stars education kit - Student activities 5-10
... spreads to the inner layers of the star. Hydrogen in the inner layers then becomes hot enough to fuse into helium and nuclear fusion reactions begin. These reactions add heat to the star, causing the outer layers to expand, while the core continues to contract. This expansion cools the star, causing ...
... spreads to the inner layers of the star. Hydrogen in the inner layers then becomes hot enough to fuse into helium and nuclear fusion reactions begin. These reactions add heat to the star, causing the outer layers to expand, while the core continues to contract. This expansion cools the star, causing ...
Moment of Inertia of Neutron Star Crust Calculations vs. Glitches
... P.Haensel , A.Y.Potekhin, D.G.Yakovlev, Neutron Stars 1: Equation of State and Structure (Springer, 2007) ...
... P.Haensel , A.Y.Potekhin, D.G.Yakovlev, Neutron Stars 1: Equation of State and Structure (Springer, 2007) ...
Star - Uplift Education
... of about 2.7 K. • That radiation corresponds to a black body spectrum of about 2.7 K. The other way of explaining CMB is: • Big Bang producing initially produced very short wavelength photons /EM radiation. As the universe expands, the wavelengths become red shifted to reach current value. █ Explain ...
... of about 2.7 K. • That radiation corresponds to a black body spectrum of about 2.7 K. The other way of explaining CMB is: • Big Bang producing initially produced very short wavelength photons /EM radiation. As the universe expands, the wavelengths become red shifted to reach current value. █ Explain ...
1128/1130 Discussion Notes
... We can, in theory, do similar calculations for stars that are closer to the edge of the disk to find the mass of a greater portion of the galaxy. Since the bulge looks so big and bright, we expect that most of the mass of the galaxy is located in the center. However, in order for this to be true th ...
... We can, in theory, do similar calculations for stars that are closer to the edge of the disk to find the mass of a greater portion of the galaxy. Since the bulge looks so big and bright, we expect that most of the mass of the galaxy is located in the center. However, in order for this to be true th ...
Midterm Study Game
... Galileo), you notice there are actually TWO stars. This is called a Binary Star System or MULTIPLE Star system. Together, describe the absolute magnitude of EACH star, compared to the apparent magnitude of the two together. The absolute magnitude of each star is less than the total absolute magnitud ...
... Galileo), you notice there are actually TWO stars. This is called a Binary Star System or MULTIPLE Star system. Together, describe the absolute magnitude of EACH star, compared to the apparent magnitude of the two together. The absolute magnitude of each star is less than the total absolute magnitud ...
White Dwarf Stars
... force of gas pressure provided by high temperatures inside the star. Although energy is lost by radiation, the star maintains its high temperature through nuclear fusion as it burns hydrogen into helium. These two forces balance each other precisely, creating a stable stellar structure—at least for ...
... force of gas pressure provided by high temperatures inside the star. Although energy is lost by radiation, the star maintains its high temperature through nuclear fusion as it burns hydrogen into helium. These two forces balance each other precisely, creating a stable stellar structure—at least for ...
Things that Go Bump in the Night – Lecture Notes
... The question is is there other evidence. Aren’t these things hypothesized to salvage evolutionary ideas? There are other examples – antibiotic resistant bacteria - that are not necessarily evolutionary but can be explained in other terms. Separate the physical data from the speculations Mass - ...
... The question is is there other evidence. Aren’t these things hypothesized to salvage evolutionary ideas? There are other examples – antibiotic resistant bacteria - that are not necessarily evolutionary but can be explained in other terms. Separate the physical data from the speculations Mass - ...
Mass and Age determination for low
... model comparison), giving as observational constraints effective ...
... model comparison), giving as observational constraints effective ...
Week 11 Concept Summary
... radio and infrared light can get through it easily. Stars collapse and form from the ISM, build up more heavy elements, and then recycle their enriched gas back to the ISM through stellar winds, pletary nebulae, and supernovae. 3. Spiral Arms: The Milky Way and many other galaxies show spiral arms. ...
... radio and infrared light can get through it easily. Stars collapse and form from the ISM, build up more heavy elements, and then recycle their enriched gas back to the ISM through stellar winds, pletary nebulae, and supernovae. 3. Spiral Arms: The Milky Way and many other galaxies show spiral arms. ...
SHELL BURNING STARS: Red Giants and Red Supergiants
... mass. Helium flash corresponds to the tip of red giant branch in the H—R diagram. Helium flash leads to such a large rise in temperature, that degeneracy of electron gas is removed. At this point farther release of heat increases pressure and makes the core expand. The expansion lowers pressure, den ...
... mass. Helium flash corresponds to the tip of red giant branch in the H—R diagram. Helium flash leads to such a large rise in temperature, that degeneracy of electron gas is removed. At this point farther release of heat increases pressure and makes the core expand. The expansion lowers pressure, den ...
Stellar evolution
Stellar evolution is the process by which a star changes during its lifetime. Depending on the mass of the star, this lifetime ranges from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. The table shows the lifetimes of stars as a function of their masses. All stars are born from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-sequence star.Nuclear fusion powers a star for most of its life. Initially the energy is generated by the fusion of hydrogen atoms at the core of the main-sequence star. Later, as the preponderance of atoms at the core becomes helium, stars like the Sun begin to fuse hydrogen along a spherical shell surrounding the core. This process causes the star to gradually grow in size, passing through the subgiant stage until it reaches the red giant phase. Stars with at least half the mass of the Sun can also begin to generate energy through the fusion of helium at their core, whereas more-massive stars can fuse heavier elements along a series of concentric shells. Once a star like the Sun has exhausted its nuclear fuel, its core collapses into a dense white dwarf and the outer layers are expelled as a planetary nebula. Stars with around ten or more times the mass of the Sun can explode in a supernova as their inert iron cores collapse into an extremely dense neutron star or black hole. Although the universe is not old enough for any of the smallest red dwarfs to have reached the end of their lives, stellar models suggest they will slowly become brighter and hotter before running out of hydrogen fuel and becoming low-mass white dwarfs.Stellar evolution is not studied by observing the life of a single star, as most stellar changes occur too slowly to be detected, even over many centuries. Instead, astrophysicists come to understand how stars evolve by observing numerous stars at various points in their lifetime, and by simulating stellar structure using computer models.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.