Constellations
... Imagine you are standing at the North Pole and see a star directly overhead. Where do you think the star would be if you were standing at the equator? ...
... Imagine you are standing at the North Pole and see a star directly overhead. Where do you think the star would be if you were standing at the equator? ...
Final review - Physics and Astronomy
... emissions are detectable. R* =The rate of formation of stars suitable for the development of intelligent life. fp = The fraction of those stars with planetary systems. ne = The number of planets, per solar system, with an environment suitable for life. fl = The fraction of suitable planets on which ...
... emissions are detectable. R* =The rate of formation of stars suitable for the development of intelligent life. fp = The fraction of those stars with planetary systems. ne = The number of planets, per solar system, with an environment suitable for life. fl = The fraction of suitable planets on which ...
Geol. 655 Isotope Geochemistry
... Hydrogen, Helium, and Carbon Burning in Main Sequence and Red Giant Stars For quite some time after the Big Bang, the universe was a more or less homogeneous, hot gas. More or less turns out to be critical wording. Inevitably (according to fluid dynamics), inhomogeneities in the gas developed. These ...
... Hydrogen, Helium, and Carbon Burning in Main Sequence and Red Giant Stars For quite some time after the Big Bang, the universe was a more or less homogeneous, hot gas. More or less turns out to be critical wording. Inevitably (according to fluid dynamics), inhomogeneities in the gas developed. These ...
September Evening Skies
... in binoculars as a 6th-mag. "star" in Aquarius, is plotted as a "+" for mid-September 2005. At chart time 7 objects of first magnitude or brighter are visible. In order of brightness they are: Arcturus, Vega, Capella, Altair, Antares, Fomalhaut, and Deneb. Our usual monthly maps are designed for sta ...
... in binoculars as a 6th-mag. "star" in Aquarius, is plotted as a "+" for mid-September 2005. At chart time 7 objects of first magnitude or brighter are visible. In order of brightness they are: Arcturus, Vega, Capella, Altair, Antares, Fomalhaut, and Deneb. Our usual monthly maps are designed for sta ...
May 2013 - Otterbein
... depends on how far away it is • Sun and Moon have very nearly the same angular size (30' = ½) when viewed from Earth • They APPEAR to have the same size, but ARE of different ...
... depends on how far away it is • Sun and Moon have very nearly the same angular size (30' = ½) when viewed from Earth • They APPEAR to have the same size, but ARE of different ...
Explore the Galaxy - Museum of Science, Boston
... Nebula- An interstellar cloud of dust and gas (predominantly hydrogen and helium). Nebulae are commonly thought of as places where stars and planets are being actively formed, but they can also describe other astronomical phenomena. A planetary nebula is the gaseous shell released upon the death of ...
... Nebula- An interstellar cloud of dust and gas (predominantly hydrogen and helium). Nebulae are commonly thought of as places where stars and planets are being actively formed, but they can also describe other astronomical phenomena. A planetary nebula is the gaseous shell released upon the death of ...
Lecture 2
... force of gravity. This is what keeps the sun and most other stars at their present diameters. In those cases the pressure, P, is generated by the motion of the individual particles in the gas, according to P = n kB T where n is the number of particles per unit volume and T is the temperature. (Insid ...
... force of gravity. This is what keeps the sun and most other stars at their present diameters. In those cases the pressure, P, is generated by the motion of the individual particles in the gas, according to P = n kB T where n is the number of particles per unit volume and T is the temperature. (Insid ...
File
... All stars begin their life when the gases (mostly hydrogen) and dust of a nebula are pulled together by gravity into a protostar. As the protostar collapses further, the center becomes hot enough to begin the fusion of hydrogen into helium. A main sequence star has now been born, and will spend the ...
... All stars begin their life when the gases (mostly hydrogen) and dust of a nebula are pulled together by gravity into a protostar. As the protostar collapses further, the center becomes hot enough to begin the fusion of hydrogen into helium. A main sequence star has now been born, and will spend the ...
PART II: Life of a Star
... • Major structural changes occur at times when a star runs out of a particular fuel (in the core). • The changes are major because the star suddenly loses an energy source and therefore starts to collapse (at least internally). • For example, when a star exhausts its core H it quickly evolves to bec ...
... • Major structural changes occur at times when a star runs out of a particular fuel (in the core). • The changes are major because the star suddenly loses an energy source and therefore starts to collapse (at least internally). • For example, when a star exhausts its core H it quickly evolves to bec ...
1. Stellar Evolution – Notes Astronomers classify stars according to
... inward. Gravity can then pull some of the gas and dust in the nebula together. The contracting cloud is then called a protostar. A protostar is the earliest stage of a star’s life. The inward collapse of material causes the center of the protostar to become very hot and dense. Once the central tempe ...
... inward. Gravity can then pull some of the gas and dust in the nebula together. The contracting cloud is then called a protostar. A protostar is the earliest stage of a star’s life. The inward collapse of material causes the center of the protostar to become very hot and dense. Once the central tempe ...
"Stars" Power Point notes
... • Light split by a prism into a rainbow is a continuous spectrum. • A continuous spectrum is emitted by hot, dense materials, such as the gas of the Sun’s photosphere. ...
... • Light split by a prism into a rainbow is a continuous spectrum. • A continuous spectrum is emitted by hot, dense materials, such as the gas of the Sun’s photosphere. ...
Stellar Remnants White Dwarfs, Neutron Stars & Black Holes
... no more than 8 Solar masses • White Dwarfs can be no more than 1.4 Solar masses and have diameters about the size of the Earth (1/100 the diameter of the Sun). • If a White Dwarf is in a binary system and close enough to its companion A White Dwarf pulling material star it may draw material off off ...
... no more than 8 Solar masses • White Dwarfs can be no more than 1.4 Solar masses and have diameters about the size of the Earth (1/100 the diameter of the Sun). • If a White Dwarf is in a binary system and close enough to its companion A White Dwarf pulling material star it may draw material off off ...
STEM for TY Teachers
... stars are rare. When supergiants die they explode as a supernova and may produce black holes. ...
... stars are rare. When supergiants die they explode as a supernova and may produce black holes. ...
Constellation
... or eddies in the dusty cloud for the first time. These eddies are probably caused by turbulence in the dust and gas around the star as they slowly expand away. The dust and gas were likely ejected from the star in a previous explosion, similar to the 2002 event, which occurred some tens of thousands ...
... or eddies in the dusty cloud for the first time. These eddies are probably caused by turbulence in the dust and gas around the star as they slowly expand away. The dust and gas were likely ejected from the star in a previous explosion, similar to the 2002 event, which occurred some tens of thousands ...
Synthetic color-magnitude diagrams: the ingredients
... Binaries that are able to survive in the dense environment of star cluster (in particular GCs) are so close that even the HST is not able to resolve the single components… So, light coming from each star will combine, and the binary system will appear as a single point-like source… when indicating w ...
... Binaries that are able to survive in the dense environment of star cluster (in particular GCs) are so close that even the HST is not able to resolve the single components… So, light coming from each star will combine, and the binary system will appear as a single point-like source… when indicating w ...
Simplified Nuclear Fusion
... reaction does not occur in one step. In several steps, four hydrogen atoms fuse into helium. This reaction releases energy because the helium atom produced has very slightly less mass than the four hydrogen atoms that started the reaction. In all energy producing nuclear reactions, the total mass of ...
... reaction does not occur in one step. In several steps, four hydrogen atoms fuse into helium. This reaction releases energy because the helium atom produced has very slightly less mass than the four hydrogen atoms that started the reaction. In all energy producing nuclear reactions, the total mass of ...
Reach_for_the_stars_final_questions.doc
... 6. Antares emits a large portion of its energy in what non-visible wavelength? (1 pt) _____________________________________________________________________________________________________ 7. White dwarfs can go supernova when they approach a certain mass. What is the name of this “critical mass”? (1 ...
... 6. Antares emits a large portion of its energy in what non-visible wavelength? (1 pt) _____________________________________________________________________________________________________ 7. White dwarfs can go supernova when they approach a certain mass. What is the name of this “critical mass”? (1 ...
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.