File
... In 2003, scientists discovered more planets orbiting in our solar system. Pluto is not anymore a planet!!!! ...
... In 2003, scientists discovered more planets orbiting in our solar system. Pluto is not anymore a planet!!!! ...
PPT Slides - Center for Computational Sciences
... – Everything heavier (Si, Fe, Al, Mg, …, U): from supernova explosions – Traces of hydrogen and helium in much reduced quantities ...
... – Everything heavier (Si, Fe, Al, Mg, …, U): from supernova explosions – Traces of hydrogen and helium in much reduced quantities ...
ems 6 - LincolnLions.org
... the matter and energy outward in a cloud Cloud expanded into clumps Clumps evolved into galaxies Universe is still expanding outward ...
... the matter and energy outward in a cloud Cloud expanded into clumps Clumps evolved into galaxies Universe is still expanding outward ...
Slides R. Bower
... into the halo many times. • Wind loading suppresses the formation of dwarf galaxies. – Winds and recycling timescale determine galaxy formation efficiency, not star formation. ...
... into the halo many times. • Wind loading suppresses the formation of dwarf galaxies. – Winds and recycling timescale determine galaxy formation efficiency, not star formation. ...
Life Cycle of Stars
... narrow band from the upper left to the lower right when plotted according to luminosity and surface temperature on the Hertzsprung-Russell diagram ...
... narrow band from the upper left to the lower right when plotted according to luminosity and surface temperature on the Hertzsprung-Russell diagram ...
Introduction to Galaxies 5/23/2013 BR: Milky Way Scale The Milky
... The center of the Milky Way is a region of very high star density, most of which is obscured by interstellar gas and dust. Motion of stars that orbit close to the galactic center indicate that this area has about 2.6 million times the mass of the Sun but is smaller than our solar system. Something t ...
... The center of the Milky Way is a region of very high star density, most of which is obscured by interstellar gas and dust. Motion of stars that orbit close to the galactic center indicate that this area has about 2.6 million times the mass of the Sun but is smaller than our solar system. Something t ...
Death of Stars
... - a sparse interstellar medium Stars form in dense clouds of this medium Gravity of denser parts of the cloud starts to attract surrounding material Increased rotation of core may lead to fragmentation that forms clusters and, later, planets Restricted movement across magnetic fields causes a disc t ...
... - a sparse interstellar medium Stars form in dense clouds of this medium Gravity of denser parts of the cloud starts to attract surrounding material Increased rotation of core may lead to fragmentation that forms clusters and, later, planets Restricted movement across magnetic fields causes a disc t ...
Birth of Stars
... that emits large amounts of energy) are needed because the oxygen you breathe, carbon in your bones, and hydrogen in the water you drink all resulted from the death of a star. ...
... that emits large amounts of energy) are needed because the oxygen you breathe, carbon in your bones, and hydrogen in the water you drink all resulted from the death of a star. ...
PowerPoint File
... unstable and sends thermal pulses through the star, throwing off the outer layers of the star into space. As the outer layers are peeled back, it reveals the extremely hot, ultraviolet-emitting carbon and oxygen core which ionizes the stellar wind ...
... unstable and sends thermal pulses through the star, throwing off the outer layers of the star into space. As the outer layers are peeled back, it reveals the extremely hot, ultraviolet-emitting carbon and oxygen core which ionizes the stellar wind ...
15.2 Characteristics of Stars
... • But the biggest gammaray generator of all is the Universe! It makes gamma radiation in all kinds of ways. ...
... • But the biggest gammaray generator of all is the Universe! It makes gamma radiation in all kinds of ways. ...
Measuring the Stars
... • 1990: A few hundred stellar parallaxes measured by now, out to about 100 lightyears. Atmospheric blurring makes further measurements from earth’s surface virtually impossible. • 1990’s: “Hipparcos” satellite, launched by European Space Agency, measures more than 100,000 parallaxes, out to more tha ...
... • 1990: A few hundred stellar parallaxes measured by now, out to about 100 lightyears. Atmospheric blurring makes further measurements from earth’s surface virtually impossible. • 1990’s: “Hipparcos” satellite, launched by European Space Agency, measures more than 100,000 parallaxes, out to more tha ...
Document
... • If you know how luminous a star REALLY is and how bright it looks from Earth, you can determine how far away it must be to look that faint. • For any star in the sky, we KNOW: ...
... • If you know how luminous a star REALLY is and how bright it looks from Earth, you can determine how far away it must be to look that faint. • For any star in the sky, we KNOW: ...
Word
... of young galaxies and extensive feed-back between inflowing gas and the explosions from supernova explosions produced by massive stars. ...
... of young galaxies and extensive feed-back between inflowing gas and the explosions from supernova explosions produced by massive stars. ...
01-Introduction
... The gas supply to the individual depends on their location in the cluster and the competition within the cluster and within the system. Observation and theory then demonstrate principles of mass segregation. These studies of the dynamical evolution, with remarkable spatial resolution provided by the ...
... The gas supply to the individual depends on their location in the cluster and the competition within the cluster and within the system. Observation and theory then demonstrate principles of mass segregation. These studies of the dynamical evolution, with remarkable spatial resolution provided by the ...
Stars
... star really is. If all stars were the same distance from us, how bright would it look compared to the other stars? ...
... star really is. If all stars were the same distance from us, how bright would it look compared to the other stars? ...
The Life of a Star - Department of Physics and Astronomy
... Young star clusters give insight into star formation and evolution • Newborn stars may form an open or galactic cluster • Stars are held together in such a cluster by gravity • Occasionally a star moving more rapidly than average will escape, or leave the cluster • A stellar association is a group ...
... Young star clusters give insight into star formation and evolution • Newborn stars may form an open or galactic cluster • Stars are held together in such a cluster by gravity • Occasionally a star moving more rapidly than average will escape, or leave the cluster • A stellar association is a group ...
Chandra and NIR Observations of Galactic HII Regions
... many nearby O stars whose winds are thought to drive instabilities and X-ray emitting shocks. • The O stars in NGC 6611 are to be contrasted with those in the younger Orion Nebula Cluster with hard, time-variable X-rays and higher LX/Lbol, most likely produced by magnetic activity. ...
... many nearby O stars whose winds are thought to drive instabilities and X-ray emitting shocks. • The O stars in NGC 6611 are to be contrasted with those in the younger Orion Nebula Cluster with hard, time-variable X-rays and higher LX/Lbol, most likely produced by magnetic activity. ...
Components of the Milky Way
... • Molecular gas (T = 10 - 100 K) • Atomic hydrogen (neutral gas, called H I) • Ionized gas (called H II) Most of the gas is in atomic form, but stars form out of the molecular material: • Giant molecular cloud forms a whole cluster of stars, may have mass of 106 Msun, size ~10 pc = 3 x 1019 cm • Mol ...
... • Molecular gas (T = 10 - 100 K) • Atomic hydrogen (neutral gas, called H I) • Ionized gas (called H II) Most of the gas is in atomic form, but stars form out of the molecular material: • Giant molecular cloud forms a whole cluster of stars, may have mass of 106 Msun, size ~10 pc = 3 x 1019 cm • Mol ...
Phys133-Sample MT2
... 2) Why did the solar nebula heat up as it collapsed? A) Radiation from other nearby stars that had formed earlier heated the nebula. B) As the cloud shrank, its gravitational potential energy was converted to kinetic energy and then into thermal energy. C) Collisions among planetesimals generated fr ...
... 2) Why did the solar nebula heat up as it collapsed? A) Radiation from other nearby stars that had formed earlier heated the nebula. B) As the cloud shrank, its gravitational potential energy was converted to kinetic energy and then into thermal energy. C) Collisions among planetesimals generated fr ...
Document
... He calculated the distance based on the variable stars. In 1923, Hubble found dozens of these variable stars in Andromeda, and determined their distance. Andromeda contains a spiral-shaped galaxy that, at a distance of 2.2 million light-years, is the farthest object visible to the naked eye. He ca ...
... He calculated the distance based on the variable stars. In 1923, Hubble found dozens of these variable stars in Andromeda, and determined their distance. Andromeda contains a spiral-shaped galaxy that, at a distance of 2.2 million light-years, is the farthest object visible to the naked eye. He ca ...
Sample Exam Questions
... d) cold gas and dust clouds 31. A galaxy that has just a little dust, but lots of red stars and a spheroidal shape, would be classified as a(n) ____ galaxy. a) elliptical b) irregular c) peculiar d) spiral 32. In a large cluster of galaxies, the mass of the very hot, x-ray-emitting gas between the g ...
... d) cold gas and dust clouds 31. A galaxy that has just a little dust, but lots of red stars and a spheroidal shape, would be classified as a(n) ____ galaxy. a) elliptical b) irregular c) peculiar d) spiral 32. In a large cluster of galaxies, the mass of the very hot, x-ray-emitting gas between the g ...
RachelStarProject
... A red giant is a very big star that weighs about one half to ten times as much as our sun. They are called red giants because they look red and are very big. Many red giants could fit thousands and thousands of suns, like the one in our solar system, inside them! ...
... A red giant is a very big star that weighs about one half to ten times as much as our sun. They are called red giants because they look red and are very big. Many red giants could fit thousands and thousands of suns, like the one in our solar system, inside them! ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.