Folie 1
... masses. Why, then, don’t we get such massive stars? There are a number of reasons, but one is that as the density increases hugely. 375k 3 ...
... masses. Why, then, don’t we get such massive stars? There are a number of reasons, but one is that as the density increases hugely. 375k 3 ...
PHS 111 Test 3 Review Chapters 26-28
... A star's size stabilizes when: thermal pressure and gravitational attraction balance each other. the star's gravitational attraction is balanced by the gravitational attraction to neighboring stars. the star first ignites. it reaches temperatures of about 3 million K. The determining factor in the ...
... A star's size stabilizes when: thermal pressure and gravitational attraction balance each other. the star's gravitational attraction is balanced by the gravitational attraction to neighboring stars. the star first ignites. it reaches temperatures of about 3 million K. The determining factor in the ...
Stellar Astronomy Unit 3 Key Terms and Matching Definitions _____
... 7. A flattened galaxy reminiscent of a pinwheel. 8. An oval galaxy with no distinguishing spiral arms. 9. A collection of galaxies held together by their mutual gravitational attraction. 10. The collection of approximately 40 galaxies that includes the Milky Way Galaxy. 11. When two similarly-sized ...
... 7. A flattened galaxy reminiscent of a pinwheel. 8. An oval galaxy with no distinguishing spiral arms. 9. A collection of galaxies held together by their mutual gravitational attraction. 10. The collection of approximately 40 galaxies that includes the Milky Way Galaxy. 11. When two similarly-sized ...
The Ever Expanding Universe
... Herculean task that involved over 2000 years of work! The Greeks knew how to do it using their mathematical invention trigonometry (the mathematics of right triangles), but a telescope precise enough to measure extremely tiny angles was not available until the 19th century when Friedrich Bessel succ ...
... Herculean task that involved over 2000 years of work! The Greeks knew how to do it using their mathematical invention trigonometry (the mathematics of right triangles), but a telescope precise enough to measure extremely tiny angles was not available until the 19th century when Friedrich Bessel succ ...
The Night Sky 12-07
... Reddish Mars is visible above the western horizon as the sky darkens in the late evening twilight. During the first few days of April, before it disappears from view, Mercury can be glimpsed along the horizon well below Mars. Jupiter reaches opposition this month, which means that it will be up all ...
... Reddish Mars is visible above the western horizon as the sky darkens in the late evening twilight. During the first few days of April, before it disappears from view, Mercury can be glimpsed along the horizon well below Mars. Jupiter reaches opposition this month, which means that it will be up all ...
Article PDF - IOPscience
... and are proportional to the corresponding efficiencies representative of the probabilities of cloud formation, cloud-cloud collisions, and the interaction of massive stars, and clouds are assumed to vary with galaxy morphological type (see Ferrini & Galli 1988) since the spiral density wave changes ...
... and are proportional to the corresponding efficiencies representative of the probabilities of cloud formation, cloud-cloud collisions, and the interaction of massive stars, and clouds are assumed to vary with galaxy morphological type (see Ferrini & Galli 1988) since the spiral density wave changes ...
DUPREE_SPLINTER
... Diagnostics of atmospheric motions Need to know where the diagnostic forms…. Contribution functions for a metal deficient giant star ...
... Diagnostics of atmospheric motions Need to know where the diagnostic forms…. Contribution functions for a metal deficient giant star ...
printer-friendly sample test questions
... A. less than the outward pressure, so the core and the outer layers of the star both expand, creating a black hole. B. less than the outward pressure, so the core and the outer layers of the star both expand, creating a red giant. C. greater than the outward pressure, so the core and the outer layer ...
... A. less than the outward pressure, so the core and the outer layers of the star both expand, creating a black hole. B. less than the outward pressure, so the core and the outer layers of the star both expand, creating a red giant. C. greater than the outward pressure, so the core and the outer layer ...
Stars are made of very hot gas. This gas is mostly hydrogen and
... faster this means they will not live as long, only about 10 billion years or so Near the end of their lives, these medium sized stars swell up becoming very large When this happens to the Sun it will grow to engulf even the Earth. Eventually it will shrink again, leaving behind most of their gas. Th ...
... faster this means they will not live as long, only about 10 billion years or so Near the end of their lives, these medium sized stars swell up becoming very large When this happens to the Sun it will grow to engulf even the Earth. Eventually it will shrink again, leaving behind most of their gas. Th ...
distance to the centre of the Milky Way.
... system, now known to be about 100,000 light years in diameter. Note that Shapley actually overestimated the distances somewhat, because he didn’t fully understand the effects of the obscuring dust. But this changed understanding was still absolutely correct in principle! We are in no special place! ...
... system, now known to be about 100,000 light years in diameter. Note that Shapley actually overestimated the distances somewhat, because he didn’t fully understand the effects of the obscuring dust. But this changed understanding was still absolutely correct in principle! We are in no special place! ...
nebula - Harding University
... At the end of that time, the hydrogen fuel in the center of the Sun will become depleted; there is too much helium to efficiently continue the thermonuclear fusion process at the core. When that happens, the radiation pressure from the center of the Sun will be reduced and the core will collapse ...
... At the end of that time, the hydrogen fuel in the center of the Sun will become depleted; there is too much helium to efficiently continue the thermonuclear fusion process at the core. When that happens, the radiation pressure from the center of the Sun will be reduced and the core will collapse ...
Black Holes - Troy University
... – 1 Big BH per galaxy (~ million-billion solar masses) – millions of little BHs per galaxy ( ~ solar mass) BHs are responsible for the most dramatic and energetic phenomena in the universe – BHs are “seen” via the light produced by infalling gas & the gravitational pull that they exert on nearby obj ...
... – 1 Big BH per galaxy (~ million-billion solar masses) – millions of little BHs per galaxy ( ~ solar mass) BHs are responsible for the most dramatic and energetic phenomena in the universe – BHs are “seen” via the light produced by infalling gas & the gravitational pull that they exert on nearby obj ...
Stellar Physics Lecture 1
... – Most stars occur along this band – an indication that this is where stars spend most of their lives. For this reason, it is known as the Main Sequence. ...
... – Most stars occur along this band – an indication that this is where stars spend most of their lives. For this reason, it is known as the Main Sequence. ...
space
... In comparison, note that the high speed Voyager I and II Spacecraft, two of the most sophisticated space missions attempted by humans, travels at 64,000 km/hour or at 18 kilometres per second! It took 1.5 years to reach Jupiter and 3 years to reach Saturn. They flew past Uranus and Neptune, and have ...
... In comparison, note that the high speed Voyager I and II Spacecraft, two of the most sophisticated space missions attempted by humans, travels at 64,000 km/hour or at 18 kilometres per second! It took 1.5 years to reach Jupiter and 3 years to reach Saturn. They flew past Uranus and Neptune, and have ...
Lecture Ten - The Sun Amongst the Stars Part II
... O-type stars have very few lines because they are so hot that most of their elements have been stripped of electrons – while in cooler, M-type stars, far more atoms retain their electrons. Patterns of absorption lines can reveal the temperatures of the stars to a precision within 50 degrees K – a f ...
... O-type stars have very few lines because they are so hot that most of their elements have been stripped of electrons – while in cooler, M-type stars, far more atoms retain their electrons. Patterns of absorption lines can reveal the temperatures of the stars to a precision within 50 degrees K – a f ...
Life Cycle of stars
... Low mass stars become medium sized to massive stars after the red giant phase. In the red giant phase, the hydrogen gas of the lower mass stars continues to burn in the outer layer and the temperature in the core of the star continues to increase and rise. Once the temperature of 200,000,000 degrees ...
... Low mass stars become medium sized to massive stars after the red giant phase. In the red giant phase, the hydrogen gas of the lower mass stars continues to burn in the outer layer and the temperature in the core of the star continues to increase and rise. Once the temperature of 200,000,000 degrees ...
The Milky Way - Clive Gifford
... Just like the planets travel around the Sun, our Solar System travels around the centre of the Milky Way. It takes between 225 and 230 million years to complete an orbit. ...
... Just like the planets travel around the Sun, our Solar System travels around the centre of the Milky Way. It takes between 225 and 230 million years to complete an orbit. ...
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.