a to z of astronomy
... DARK CLOUD A relatively dense cloud of interstellar material containing dust particles. The dust particles absorb light from the more distant stars etc, so that the region appears dark compared with its surroundings. The clouds are often of low temperature and contain many molecules. DARK MATTER Mat ...
... DARK CLOUD A relatively dense cloud of interstellar material containing dust particles. The dust particles absorb light from the more distant stars etc, so that the region appears dark compared with its surroundings. The clouds are often of low temperature and contain many molecules. DARK MATTER Mat ...
Stellar Evolution: the Death of Stars
... • AGB star is also called Carbon Star • AGB star has strong stellar wind, losing mass at very high rate • AGB star enriches interstellar medium with carbon, and some oxygen and nitrogen • Most of carbons in our body are likely from earlygeneration AGB stars nearby ...
... • AGB star is also called Carbon Star • AGB star has strong stellar wind, losing mass at very high rate • AGB star enriches interstellar medium with carbon, and some oxygen and nitrogen • Most of carbons in our body are likely from earlygeneration AGB stars nearby ...
PH607lec12
... Though many astronomers agree that hierarchical formation seems to be occurring, there are still some wrinkles to the theory. For example, the very most massive galaxies don't seem to be growing at as high a rate as middle-mass galaxies. When astronomers look at the brightest galaxies now compared t ...
... Though many astronomers agree that hierarchical formation seems to be occurring, there are still some wrinkles to the theory. For example, the very most massive galaxies don't seem to be growing at as high a rate as middle-mass galaxies. When astronomers look at the brightest galaxies now compared t ...
lecture19 - Stony Brook University
... rays in the universe, lasting from a fraction to several seconds. ...
... rays in the universe, lasting from a fraction to several seconds. ...
BASIC PROPERTIES of STARS - 2
... Venus is about 105,000,000 km from the Sun. (1) What is approximate time to get the return signal from Venus when it is at its closest to Earth? C = 3 x 105 km/s (A 150; B 200; C 300; D 400 seconds) (2) What is the approximate time to get a return signal from Venus when Venus is at its most distant ...
... Venus is about 105,000,000 km from the Sun. (1) What is approximate time to get the return signal from Venus when it is at its closest to Earth? C = 3 x 105 km/s (A 150; B 200; C 300; D 400 seconds) (2) What is the approximate time to get a return signal from Venus when Venus is at its most distant ...
Theory of the Infinite Universe
... Nuclear fusion occurs when two elements are fused together to form a heavier element. This process releases energy. Massive stars begin as a giant ball of burning hydrogen. Over time the compos ...
... Nuclear fusion occurs when two elements are fused together to form a heavier element. This process releases energy. Massive stars begin as a giant ball of burning hydrogen. Over time the compos ...
Challenging our Understanding of Stellar Structure and Evolution
... What is the biggest star? What is the smallest star? How is the mass of a stellar nursery partitioned into various types of stars? and, What is the mass content of the Galaxy and how does it evolve? To answer these and other fundamental questions requires masses to 1% accuracy. Why 1%? Our knowledge ...
... What is the biggest star? What is the smallest star? How is the mass of a stellar nursery partitioned into various types of stars? and, What is the mass content of the Galaxy and how does it evolve? To answer these and other fundamental questions requires masses to 1% accuracy. Why 1%? Our knowledge ...
SpfFin - Academic Program Pages
... By the observation of its gravitational effect upon a visible companion in a binary star. By the existence of a very dark area in the sky, from which nothing is being emitted. By divine revelation. 21. The radius of the event horizon of a black hole, the Schwarzschild radius, is constant, as predict ...
... By the observation of its gravitational effect upon a visible companion in a binary star. By the existence of a very dark area in the sky, from which nothing is being emitted. By divine revelation. 21. The radius of the event horizon of a black hole, the Schwarzschild radius, is constant, as predict ...
WSN 42 (2016) 132-142
... background of your finger is left to do this by eye. In each case, the background will change finger, because your eyes because of parallax apart and together different contexts to show you. In this way, we can calculate the distance between two eyes finger apart, this method called parallax. To cal ...
... background of your finger is left to do this by eye. In each case, the background will change finger, because your eyes because of parallax apart and together different contexts to show you. In this way, we can calculate the distance between two eyes finger apart, this method called parallax. To cal ...
How to Plot the H-R Diagram and Use its Applications
... background of your finger is left to do this by eye. In each case, the background will change finger, because your eyes because of parallax apart and together different contexts to show you. In this way, we can calculate the distance between two eyes finger apart, this method called parallax. To cal ...
... background of your finger is left to do this by eye. In each case, the background will change finger, because your eyes because of parallax apart and together different contexts to show you. In this way, we can calculate the distance between two eyes finger apart, this method called parallax. To cal ...
Stellar Populations of Galaxies- 2 Lectures H
... abundance of 'metals' (elements heavier than He) and their relative abundance; total abundance of metals by mass (Z) in sun is ~0.013 to zeroth order (more later) there are 4 sources of metals BBN- Li Be Atomic Number Type I SN -Fe, Ni etc Type II SN - O, Ne, etc Other (stellar winds, planetary nebu ...
... abundance of 'metals' (elements heavier than He) and their relative abundance; total abundance of metals by mass (Z) in sun is ~0.013 to zeroth order (more later) there are 4 sources of metals BBN- Li Be Atomic Number Type I SN -Fe, Ni etc Type II SN - O, Ne, etc Other (stellar winds, planetary nebu ...
The most important questions to study for the exam
... 6. A star appears to move back and forth with a period of exactly 1 year with respect to a distant galaxy that appears close to it in our sky. What is the most likely cause of this observed motion? • The observed motion is simply the motion of the star around the center of the galaxy. ...
... 6. A star appears to move back and forth with a period of exactly 1 year with respect to a distant galaxy that appears close to it in our sky. What is the most likely cause of this observed motion? • The observed motion is simply the motion of the star around the center of the galaxy. ...
Spatial distribution of stars in the Milky Way
... In particular, since the original classification more population types have appeared, such as an intermediate type II population, corresponding to the thick disk stars. ...
... In particular, since the original classification more population types have appeared, such as an intermediate type II population, corresponding to the thick disk stars. ...
Neutron Stars
... Leftover core from Type II supernova - a tightly packed ball of neutrons. Diameter: 20 km only! Mass: 1.4 - 3(?) MSun Density: 1014 g / cm3 ! Surface gravity: 1012 higher Escape velocity: 0.6c ...
... Leftover core from Type II supernova - a tightly packed ball of neutrons. Diameter: 20 km only! Mass: 1.4 - 3(?) MSun Density: 1014 g / cm3 ! Surface gravity: 1012 higher Escape velocity: 0.6c ...
AST 301 Introduction to Astronomy - University of Texas Astronomy
... The rate of fusion depends strongly on temperature, because the protons must be moving fast to get close enough together so they can be attracted by the strong force before their electrical repulsion pushes them apart. If the center of a star is too hot, fusion will run faster than energy is being r ...
... The rate of fusion depends strongly on temperature, because the protons must be moving fast to get close enough together so they can be attracted by the strong force before their electrical repulsion pushes them apart. If the center of a star is too hot, fusion will run faster than energy is being r ...
The Pleiades in the Salle des Taureaux", Grotte de Lascaux
... the oldest traditions, for example from the nomenclature in the Almanac of Fig. 4 The copperplate engraving VII from Bode, 1805. The figure of the Klaudios Ptolemaios2 (ERREN, 1967: constellation looks like the rock picture of the aurochs no. 18 in the "Salle des 320; KUNITZSCH, 1974: 268-269, 271); ...
... the oldest traditions, for example from the nomenclature in the Almanac of Fig. 4 The copperplate engraving VII from Bode, 1805. The figure of the Klaudios Ptolemaios2 (ERREN, 1967: constellation looks like the rock picture of the aurochs no. 18 in the "Salle des 320; KUNITZSCH, 1974: 268-269, 271); ...
Radio-quiet Isolated Neutron Stars
... Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
... Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
Changes in Our Sky – Kindergarten
... • Background information is embedded in the lesson and in the following: Rather than saying the sun, stars, or moon move, say Earth has rotated so they are viewed in different positions in the sky and that they “appear” to move across the sky. The sun appears to move across the sky every day from ea ...
... • Background information is embedded in the lesson and in the following: Rather than saying the sun, stars, or moon move, say Earth has rotated so they are viewed in different positions in the sky and that they “appear” to move across the sky. The sun appears to move across the sky every day from ea ...
Astronomy 3020: Cosmology Samples for Exam 3
... 1. Sketch an H-R diagram. Assume you are plotting a sample of 100 stars that are a good representation of all stars. Label the areas of the different luminosity classes on your diagram. 2. Describe the formation of a star from a clump of gas and dust in a GMC through the protostar stage and finally ...
... 1. Sketch an H-R diagram. Assume you are plotting a sample of 100 stars that are a good representation of all stars. Label the areas of the different luminosity classes on your diagram. 2. Describe the formation of a star from a clump of gas and dust in a GMC through the protostar stage and finally ...
Lesson 4 - Scientist in Residence Program
... Stars like humans come in different sizes and colours. However, unlike people a star’s colour and brightness is highly dependent on its size. We can get clues about how hot a star is and a star’s age from a star’s colour. Stars are often classified based on size, temperature and spectra (or its colo ...
... Stars like humans come in different sizes and colours. However, unlike people a star’s colour and brightness is highly dependent on its size. We can get clues about how hot a star is and a star’s age from a star’s colour. Stars are often classified based on size, temperature and spectra (or its colo ...
Last time: looked at proton-proton chain to convert Hydrogen into
... once there is an overdense region of matter it has a run-away effect and everything collapses down into a disk due to gravity. the angular momentum of the original star forming (b) cloud builds with time forming a disk (c) the angular momentum of the star forming cloud is constant with time and so a ...
... once there is an overdense region of matter it has a run-away effect and everything collapses down into a disk due to gravity. the angular momentum of the original star forming (b) cloud builds with time forming a disk (c) the angular momentum of the star forming cloud is constant with time and so a ...
PowerPoint
... On earth, we see this wobble as a Doppler shift in the wavelength of the light from the star. • As the star moves towards us, the light shifts towards the blue end of the spectrum. • As the star moves away from us, the light shifts towards the red end of the spectrum. ...
... On earth, we see this wobble as a Doppler shift in the wavelength of the light from the star. • As the star moves towards us, the light shifts towards the blue end of the spectrum. • As the star moves away from us, the light shifts towards the red end of the spectrum. ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.