The Sun: Source of heat and light
... left the star (or planet) that we are looking at. Let’s imagine that three stars A, B and C are all “born” at about the same time. Because the stars are at different distances from Earth, and light coming from them travels at a finite speed, light which arrives at our eyes simultaneously must have b ...
... left the star (or planet) that we are looking at. Let’s imagine that three stars A, B and C are all “born” at about the same time. Because the stars are at different distances from Earth, and light coming from them travels at a finite speed, light which arrives at our eyes simultaneously must have b ...
V = 3 d3 = 4188.8 pc N = ρV = 0.1 pc χ 4188.8 pc = 419
... Since more massive stars have shorter lifetimes, we conclude that stars more massive than about 1.9 times the mass of the Sun will have lifetimes that are too short to allow intelligent life to evolve. Answer c) Stars with mass greater than about 1.9 times the mass of the Sun. For the following thre ...
... Since more massive stars have shorter lifetimes, we conclude that stars more massive than about 1.9 times the mass of the Sun will have lifetimes that are too short to allow intelligent life to evolve. Answer c) Stars with mass greater than about 1.9 times the mass of the Sun. For the following thre ...
Stars, Galaxies, and the Universe Section 1
... Polaris is almost exactly above the pole of Earth’s rotational axis, so Polaris moves only slightly around the pole during one rotation of Earth. ...
... Polaris is almost exactly above the pole of Earth’s rotational axis, so Polaris moves only slightly around the pole during one rotation of Earth. ...
Opakování z minulého cvičení
... HR diagram – star formation Star formation Stars form when cool, relatively dense clouds of gas and dust in space shrink in upon themselves as a result of gravitational collapse. This mainly happens in giant molecular clouds, where the density is about 1 billion or 10 billion atoms per cubic metre. ...
... HR diagram – star formation Star formation Stars form when cool, relatively dense clouds of gas and dust in space shrink in upon themselves as a result of gravitational collapse. This mainly happens in giant molecular clouds, where the density is about 1 billion or 10 billion atoms per cubic metre. ...
Evolved Stellar Populations
... To understand the history of formation and evolution of galaxies we need to understand the distribution of age, chemical abundance and kinematics of both the stars and gas. The best laboratories for these studies are galaxies of the Local Group and in particular the Magellanic Clouds (nearby, kn ...
... To understand the history of formation and evolution of galaxies we need to understand the distribution of age, chemical abundance and kinematics of both the stars and gas. The best laboratories for these studies are galaxies of the Local Group and in particular the Magellanic Clouds (nearby, kn ...
Birth - Wayne State University Physics and Astronomy
... refine their models of planet formation Almost all the planets are Jupiter-sized, and many have highly eccentric orbits close to their star This is a surprise and is difficult for the early models to explain ...
... refine their models of planet formation Almost all the planets are Jupiter-sized, and many have highly eccentric orbits close to their star This is a surprise and is difficult for the early models to explain ...
Stars A globular cluster is a tightly grouped swarm of stars held
... magnitude numbers to include stars brighter than first magnitude and dimmer than sixth magnitude. A star that is brighter than first magnitude has a magnitude less than 1. For example, the apparent magnitude of Rigel is 0.12. Extremely bright stars have magnitudes less than zero -- that is, their de ...
... magnitude numbers to include stars brighter than first magnitude and dimmer than sixth magnitude. A star that is brighter than first magnitude has a magnitude less than 1. For example, the apparent magnitude of Rigel is 0.12. Extremely bright stars have magnitudes less than zero -- that is, their de ...
Stellar Continua
... Using the CTIO 4-m telescope, an astronomer obtained 100 photons per A at 5480 A in a one hour exposure. Again assuming an overall efficiency of 10%, what was the magnitude of the star if B-V=0? ...
... Using the CTIO 4-m telescope, an astronomer obtained 100 photons per A at 5480 A in a one hour exposure. Again assuming an overall efficiency of 10%, what was the magnitude of the star if B-V=0? ...
AST 111 – Introduction to Astronomy
... d. originated just after the telescope was invented. e. was devised by Galileo. 4. If we say that an object is 1,000 light-years away we see it a. as it looked 1,000 light-years ago. b. as it is right now, but it appears 1,000 times dimmer. c. as it looked 1,000 years ago. d. as it would appear to o ...
... d. originated just after the telescope was invented. e. was devised by Galileo. 4. If we say that an object is 1,000 light-years away we see it a. as it looked 1,000 light-years ago. b. as it is right now, but it appears 1,000 times dimmer. c. as it looked 1,000 years ago. d. as it would appear to o ...
INTERSTELLAR MedLab
... Emission – a gas cloud that receives energy from a hot star(s), allowing the nebula to give off radiation in emission. Reflection – dust clouds that reflect (scatter) a star’s light to us Dark – high densities of dust and gas that redden or extinct the light from the stars located behind the cloud. ...
... Emission – a gas cloud that receives energy from a hot star(s), allowing the nebula to give off radiation in emission. Reflection – dust clouds that reflect (scatter) a star’s light to us Dark – high densities of dust and gas that redden or extinct the light from the stars located behind the cloud. ...
Physics 161 Homework 8 - Solutions Wednesday
... Now, once again, the neutron star is composed of neutrons held together by gravitational pressure, supported by neutron degeneracy pressure. Since the star is in equilibrium, the pressures have to be equal. Now, if the key was pulled out of the star, then the gravitational pressure would be removed. ...
... Now, once again, the neutron star is composed of neutrons held together by gravitational pressure, supported by neutron degeneracy pressure. Since the star is in equilibrium, the pressures have to be equal. Now, if the key was pulled out of the star, then the gravitational pressure would be removed. ...
Iron does not burn.
... Its synchrotron emission has its waves aligned in more or less the same plane. At visible wavelengths this phenomenon can be viewed with polarized lenses (as in certain sunglasses, and in modern 3-D ...
... Its synchrotron emission has its waves aligned in more or less the same plane. At visible wavelengths this phenomenon can be viewed with polarized lenses (as in certain sunglasses, and in modern 3-D ...
Encyclopedia of Optical Engineering Stellar Evolution
... In this configuration, the electrons become closely ‘‘stacked’’ in space, separated by the Pauli exclusion principle: No two electrons can have the same four quantum numbers relating to energy and motion in a very tiny volume. Basically, the electrons can only be pushed so close together. The electr ...
... In this configuration, the electrons become closely ‘‘stacked’’ in space, separated by the Pauli exclusion principle: No two electrons can have the same four quantum numbers relating to energy and motion in a very tiny volume. Basically, the electrons can only be pushed so close together. The electr ...
Chapter 2 Surveying the stars 2.1 Star magnitudes
... more than a million million times less. With the Hubble Space Telescope the intensity is more than 10 000 million million times less. Astronomers in ancient times first classified stars in six magnitudes of brightness, a first magnitude star being one of the brightest in the sky and a sixth magnitud ...
... more than a million million times less. With the Hubble Space Telescope the intensity is more than 10 000 million million times less. Astronomers in ancient times first classified stars in six magnitudes of brightness, a first magnitude star being one of the brightest in the sky and a sixth magnitud ...
Document
... • High Mass stars often times explode! • This spreads all of the elements Hydrogen through Iron (which makes up our planets and other new stars) and forms all elements after Iron (up to element 92). ...
... • High Mass stars often times explode! • This spreads all of the elements Hydrogen through Iron (which makes up our planets and other new stars) and forms all elements after Iron (up to element 92). ...
Chapter 16 Star Birth
... Trapping of Thermal Energy • As contraction packs the molecules and dust particles of a cloud fragment closer together, it becomes harder for infrared and radio photons to escape • Thermal energy then begins to build up inside, increasing the internal pressure • Contraction slows down, and the cent ...
... Trapping of Thermal Energy • As contraction packs the molecules and dust particles of a cloud fragment closer together, it becomes harder for infrared and radio photons to escape • Thermal energy then begins to build up inside, increasing the internal pressure • Contraction slows down, and the cent ...
Chapter 16 Star Birth Where do stars form? Star
... • Emission lines from molecules in a cloud can prevent a pressure buildup by converting thermal energy into infrared and radio photons that escape the cloud ...
... • Emission lines from molecules in a cloud can prevent a pressure buildup by converting thermal energy into infrared and radio photons that escape the cloud ...
Multiple Choice, continued Stars, Galaxies, and the Universe
... that light travels through space in 1 year. Because the speed of light through space is about 300,000 km/ s, light travels approximately 9.46 trillion kilometers in one year. Even after astronomers figured out that stars were far from Earth, the nature of the universe was hard to understand. Some as ...
... that light travels through space in 1 year. Because the speed of light through space is about 300,000 km/ s, light travels approximately 9.46 trillion kilometers in one year. Even after astronomers figured out that stars were far from Earth, the nature of the universe was hard to understand. Some as ...
shirley - Yancy L. Shirley`s Webpage
... Dense cores may be forming cluster of stars = SED dominated by most massive star = SED classification confused! Very broad linewidths consistent with turbulent gas ...
... Dense cores may be forming cluster of stars = SED dominated by most massive star = SED classification confused! Very broad linewidths consistent with turbulent gas ...
Reading Quiz 05 - Chapter 10 Quiz Instructions
... A Hertzsprung-Russell (HR) Diagram tells us a lot about stars. One of the answers given below, however, is NOT something that can be inferred either directly or indirectly about the stars placed on an H-R diagram. Which answer is wrong? ...
... A Hertzsprung-Russell (HR) Diagram tells us a lot about stars. One of the answers given below, however, is NOT something that can be inferred either directly or indirectly about the stars placed on an H-R diagram. Which answer is wrong? ...
STELLAR FORMATION AND EVOLUTION
... To be able to understand the life cycle of a star, you need a good understanding of the Hertzsprung-Russell Diagram. In 1905, two astronomers, Einar Hertzsprung and Henry Norris Russell, independently plotted the temperature of a star versus the brightness of the star. They did this with a large num ...
... To be able to understand the life cycle of a star, you need a good understanding of the Hertzsprung-Russell Diagram. In 1905, two astronomers, Einar Hertzsprung and Henry Norris Russell, independently plotted the temperature of a star versus the brightness of the star. They did this with a large num ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.