Hubble Space Telescope Image
... distorting light from individual members of this cluster so that we see a halo effect. distant galaxies, which lie five to 10 times farther than Abell 2218. This distant population existed when the universe was just a quarter of its current age. ...
... distorting light from individual members of this cluster so that we see a halo effect. distant galaxies, which lie five to 10 times farther than Abell 2218. This distant population existed when the universe was just a quarter of its current age. ...
PH607lec08
... Can define a Hubble length: c / H0 ~ 4000 Mpc at which this expression for the recession velocity extrapolates to the speed of light - more detailed relativistic treatment is needed for distances of this order. Can also define a Hubble time: 1 / H0 ~ 1010 years …this is to order of magnitude the age ...
... Can define a Hubble length: c / H0 ~ 4000 Mpc at which this expression for the recession velocity extrapolates to the speed of light - more detailed relativistic treatment is needed for distances of this order. Can also define a Hubble time: 1 / H0 ~ 1010 years …this is to order of magnitude the age ...
Planisphere
... RA-Dec coordinates are only good for storing the location of stars in reference books. This coordinate system, called the equatorial system, tells us nothing about how to actually find something in the sky when we go outside. The altitude-azimuth coordinate system, called the horizon system, fulfill ...
... RA-Dec coordinates are only good for storing the location of stars in reference books. This coordinate system, called the equatorial system, tells us nothing about how to actually find something in the sky when we go outside. The altitude-azimuth coordinate system, called the horizon system, fulfill ...
Level 2 Science (90764) 2011 Assessment Schedule
... Supernova gives out clouds of gases and plasma exploding off its surface. AND These gas clouds are the birth places for new stars. AND After this process ceases, a black hole or a dense neutron star remains (detail provided about the formation). Eg: The core of the star then collapses, combining pro ...
... Supernova gives out clouds of gases and plasma exploding off its surface. AND These gas clouds are the birth places for new stars. AND After this process ceases, a black hole or a dense neutron star remains (detail provided about the formation). Eg: The core of the star then collapses, combining pro ...
Assessment Schedule
... Supernova gives out clouds of gases and plasma exploding off its surface. AND These gas clouds are the birth places for new stars. AND After this process ceases, a black hole or a dense neutron star remains (detail provided about the formation). Eg: The core of the star then collapses, combining pro ...
... Supernova gives out clouds of gases and plasma exploding off its surface. AND These gas clouds are the birth places for new stars. AND After this process ceases, a black hole or a dense neutron star remains (detail provided about the formation). Eg: The core of the star then collapses, combining pro ...
Where Do Chemical Elements Come From?
... produce Type Ia supernovae is hotly debated.) In a popular scenario, so much mass piles up on the white dwarf that its core reaches a critical density of 2 x 109 g/cm3. ...
... produce Type Ia supernovae is hotly debated.) In a popular scenario, so much mass piles up on the white dwarf that its core reaches a critical density of 2 x 109 g/cm3. ...
B2 Star Formation and Nuclear Fusion
... optically thick and radiation is no longer able to escape. • During collapse, gravitational potential energy is liberated and radiated away. • Transition to being optically thick prevents further cooling and the temperature begins to rise. In the temperature-density diagram, the star begins an adiab ...
... optically thick and radiation is no longer able to escape. • During collapse, gravitational potential energy is liberated and radiated away. • Transition to being optically thick prevents further cooling and the temperature begins to rise. In the temperature-density diagram, the star begins an adiab ...
Tutor Marked Assignment
... We hope you are familiar with the system of evaluation to be followed for the Bachelor’s Degree Programme. At this stage you may probably like to re-read the section on assignments for Elective Courses in the Programme Guide that we sent you after your enrolment. A weightage of 30 per cent, as you a ...
... We hope you are familiar with the system of evaluation to be followed for the Bachelor’s Degree Programme. At this stage you may probably like to re-read the section on assignments for Elective Courses in the Programme Guide that we sent you after your enrolment. A weightage of 30 per cent, as you a ...
Lecture 9: Stellar Spectra
... Most of the H is ionized, so only very weak H lines in visible A Stars (7500-11,000K) Ideal excitation conditions, strongest H lines in visible. G stars (5200-5900 K) Too cool, little excited H, so only weak H lines in the visible Line strengths diagram shown in Figure 19-12 ...
... Most of the H is ionized, so only very weak H lines in visible A Stars (7500-11,000K) Ideal excitation conditions, strongest H lines in visible. G stars (5200-5900 K) Too cool, little excited H, so only weak H lines in the visible Line strengths diagram shown in Figure 19-12 ...
Mass and composition determine most of the properties of a star
... If person A (pen light) stood in the classroom and person B (mega light) stood at the baseball fields across the street, which light would appear brighter? You cannot tell by looking in the sky how bright a star truly is. The farther away the star is, the less bright it ...
... If person A (pen light) stood in the classroom and person B (mega light) stood at the baseball fields across the street, which light would appear brighter? You cannot tell by looking in the sky how bright a star truly is. The farther away the star is, the less bright it ...
Eruptive Variables - Scientific Research Publishing
... where L is the luminosity, M the mass, G the universal gravitational constant, c the velocity of light in the empty space, α = 2.5 is a constant, and kc is the coefficient of opacity at the stellar center, and according to the theoretical frame developed by A.S. Eddington [3] it can be shown that, i ...
... where L is the luminosity, M the mass, G the universal gravitational constant, c the velocity of light in the empty space, α = 2.5 is a constant, and kc is the coefficient of opacity at the stellar center, and according to the theoretical frame developed by A.S. Eddington [3] it can be shown that, i ...
Some Important Introductory Concepts
... Units of length, size, mass, … Defined just for convenience First, realize that the units we use in measuring anything are usually just for convenience. You don’t give the distance from Austin to New York in inches, or your age in seconds, or your height in miles. Example: For distance or size, w ...
... Units of length, size, mass, … Defined just for convenience First, realize that the units we use in measuring anything are usually just for convenience. You don’t give the distance from Austin to New York in inches, or your age in seconds, or your height in miles. Example: For distance or size, w ...
A Stellar Astronomy Toolbox 9
... If we think back to Galileo’s law, all objects fall at the same rate regardless of their mass, then there should be no reason that air molecules shouldn’t fall to the ground at the same rate that a book would fall. But we know that this is not the case. The atmosphere of the Earth is not lying on th ...
... If we think back to Galileo’s law, all objects fall at the same rate regardless of their mass, then there should be no reason that air molecules shouldn’t fall to the ground at the same rate that a book would fall. But we know that this is not the case. The atmosphere of the Earth is not lying on th ...
Elliptical Galaxies
... •normal ellipticals can contain from 1 to 100 billion stars. •giant elliptical galaxies are found at the center of dense clusters of galaxies. •a giant elliptical galaxy may have 100 times as many stars as the biggest normal galaxies •Giant elliptical galaxies have grown and continue to grow by grav ...
... •normal ellipticals can contain from 1 to 100 billion stars. •giant elliptical galaxies are found at the center of dense clusters of galaxies. •a giant elliptical galaxy may have 100 times as many stars as the biggest normal galaxies •Giant elliptical galaxies have grown and continue to grow by grav ...
memphis astronomical society short course in astronomy 2015
... sketch the so-called “Main Sequence”, including blue giants and red dwarfs. Indicate the Sun’s position. Indicate the position of red giants, red supergiants, and white dwarfs. Know what determines the color (spectral classification) of a star. Be aware of the magnitude scale and the difference in b ...
... sketch the so-called “Main Sequence”, including blue giants and red dwarfs. Indicate the Sun’s position. Indicate the position of red giants, red supergiants, and white dwarfs. Know what determines the color (spectral classification) of a star. Be aware of the magnitude scale and the difference in b ...
Week 3 - OSU Astronomy
... It seems stars cannot stay together at higher masses - pressure beats gravity! ...
... It seems stars cannot stay together at higher masses - pressure beats gravity! ...
Is the Sun a Star? - Classroom Websites
... school students, is to present new information about planetary systems that have been discovered around other stars. Students could begin by researching extrasolar planets at a website such as http:// planetquestjpl. nasa.gov! Having students draw what a distant planetary system might look like base ...
... school students, is to present new information about planetary systems that have been discovered around other stars. Students could begin by researching extrasolar planets at a website such as http:// planetquestjpl. nasa.gov! Having students draw what a distant planetary system might look like base ...
Earth and Space - Kennesaw State University College of Science
... – The universe begins as a singularity (point) – In the first 10-34 sec, the universe “inflates” (expands) and is very “hot,” so energy & matter are indistinguishable (“quark soup”) – By 1 sec, the universe has expanded and cooled to the point that stable protons and neutrons can form – By 300,000 y ...
... – The universe begins as a singularity (point) – In the first 10-34 sec, the universe “inflates” (expands) and is very “hot,” so energy & matter are indistinguishable (“quark soup”) – By 1 sec, the universe has expanded and cooled to the point that stable protons and neutrons can form – By 300,000 y ...
The Resounding Universe
... disciplines. Sight and hearing are complementary senses: eyes are made for looking at celestial bodies and ears to follow their harmonious motions. Aristotle (c. 384 BC – c. 322 BC) explains why mortals cannot hear these sounds. In fact, a sound or a noise can be perceived only when in contrast with ...
... disciplines. Sight and hearing are complementary senses: eyes are made for looking at celestial bodies and ears to follow their harmonious motions. Aristotle (c. 384 BC – c. 322 BC) explains why mortals cannot hear these sounds. In fact, a sound or a noise can be perceived only when in contrast with ...
printer-friendly version of benchmark
... As astronomers study stars, there are a number of characteristics that can be investigated: temperature, composition, luminosity, mass, motion, and more. Some characteristics are directly observable (such as temperature and some motions), while others (such as mass) require inference from other data ...
... As astronomers study stars, there are a number of characteristics that can be investigated: temperature, composition, luminosity, mass, motion, and more. Some characteristics are directly observable (such as temperature and some motions), while others (such as mass) require inference from other data ...