AST 207 Final Exam, Answers 15 December 2010
... b. (3 pts.) How is dark energy different from ordinary matter? Dark energy has negative pressure and repulsive gravity. 9. A galaxy is moving at 1000km/s with respect to the frame in which the Big Bang is at rest. It is moving toward 0hr right ascension and 0 declination, written 0hr+0. a. (2 pts. ...
... b. (3 pts.) How is dark energy different from ordinary matter? Dark energy has negative pressure and repulsive gravity. 9. A galaxy is moving at 1000km/s with respect to the frame in which the Big Bang is at rest. It is moving toward 0hr right ascension and 0 declination, written 0hr+0. a. (2 pts. ...
Spectra and the Doppler Effect
... 8. What happens to the pitch of sound as an object moves away (or recedes) from an observer? (the wave is elongated and therefore moving away at lower ...
... 8. What happens to the pitch of sound as an object moves away (or recedes) from an observer? (the wave is elongated and therefore moving away at lower ...
H-R Diagram
... To graph a simplified Hertzsprung-Russell diagram To identify the characteristics of a star from data in the diagram To classify a star by its position in the diagram To compare the life cycle stages of stars based on their positions in the diagram Background The Hertzsprung-Russell diagram, or H-R ...
... To graph a simplified Hertzsprung-Russell diagram To identify the characteristics of a star from data in the diagram To classify a star by its position in the diagram To compare the life cycle stages of stars based on their positions in the diagram Background The Hertzsprung-Russell diagram, or H-R ...
- Stevenson High School
... 18. For October the 10th at 6 pm on the Star Wheel, look at the stars which are visible in the horizon. For our midnorthern hemisphere observer, which bright star is almost overhead at the zenith? ________________ 19. Suppose you set the Star Wheel for December 22 at midnight and look at the stars w ...
... 18. For October the 10th at 6 pm on the Star Wheel, look at the stars which are visible in the horizon. For our midnorthern hemisphere observer, which bright star is almost overhead at the zenith? ________________ 19. Suppose you set the Star Wheel for December 22 at midnight and look at the stars w ...
Thermonuclear Reactions: The Beginning and the
... neutron stars, "black holes" and other little known sources of radiation, like quasars, whose masses are unknown. From mechanics and Newton's gravitational law one can calculate the velocity needed for a body, mx, to escape the gravitational pull of a larger mass, m, where mx n m. For example, if m ...
... neutron stars, "black holes" and other little known sources of radiation, like quasars, whose masses are unknown. From mechanics and Newton's gravitational law one can calculate the velocity needed for a body, mx, to escape the gravitational pull of a larger mass, m, where mx n m. For example, if m ...
Lesson Plan G2 The Stars
... they will examine several different stars and they will see how some stars end their lives. ...
... they will examine several different stars and they will see how some stars end their lives. ...
Testing - uwyo.edu
... carbon in a shell around the carbon core, and hydrogen fuses to helium in a shell around the helium layer. • This double shell–burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses. • With each spike, convection dredges carbon up from core and t ...
... carbon in a shell around the carbon core, and hydrogen fuses to helium in a shell around the helium layer. • This double shell–burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses. • With each spike, convection dredges carbon up from core and t ...
r*=13.6 km MPA1 EOS
... more stars in a region only 30 light years across, which suggests that all the stars were born in a single episode of star formation. Based on optical properties such as brightness and color some of the normal stars in the cluster are known to have masses of about 40 suns. ...
... more stars in a region only 30 light years across, which suggests that all the stars were born in a single episode of star formation. Based on optical properties such as brightness and color some of the normal stars in the cluster are known to have masses of about 40 suns. ...
Black Holes: Edge of Infinity Jonathan McKinney
... Photon Sphere: Inside, objects cannot orbit at all, at (~3/2rH for a=0) Static Limit: Inside, objects cannot be static (varies from 1rH to 2rH for a=M) Horizon or Schwarzschild radius: Inside rH, objects must fall Singularity: Near, physics breaks down (need quantum gravity), reached in finite time ...
... Photon Sphere: Inside, objects cannot orbit at all, at (~3/2rH for a=0) Static Limit: Inside, objects cannot be static (varies from 1rH to 2rH for a=M) Horizon or Schwarzschild radius: Inside rH, objects must fall Singularity: Near, physics breaks down (need quantum gravity), reached in finite time ...
ppt - Astronomy & Physics
... e.g. hot gaseous nebulae. The emission lines tell us the composition of the gas. ...
... e.g. hot gaseous nebulae. The emission lines tell us the composition of the gas. ...
The Milky Way II AST 112
... • They will explode, supplying enriched material and gas to the ISM. • This material expands, cools, and collapses back into stars… • … and on and on and on. ...
... • They will explode, supplying enriched material and gas to the ISM. • This material expands, cools, and collapses back into stars… • … and on and on and on. ...
a cluster of stars - PEO - Wisconsin State Chapter
... In suggesting the star as the P.E.O. emblem, Alice Coffin could not have selected a more fitting symbol. Out of the Heart reports that the women had studied astronomy and were intrigued by the vastness of the universes, and for them, the star symbolized their quest for the highest and best things th ...
... In suggesting the star as the P.E.O. emblem, Alice Coffin could not have selected a more fitting symbol. Out of the Heart reports that the women had studied astronomy and were intrigued by the vastness of the universes, and for them, the star symbolized their quest for the highest and best things th ...
Rotational spin-up in the 30-Myr
... one of the fundamental quantities, like mass and metallicity, defining the star’s properties and evolution. Rotation influences the star’s internal structure and the mixing processes in the stellar interior that are reflected in surface elemental abundances. It is also the main driver for magnetic a ...
... one of the fundamental quantities, like mass and metallicity, defining the star’s properties and evolution. Rotation influences the star’s internal structure and the mixing processes in the stellar interior that are reflected in surface elemental abundances. It is also the main driver for magnetic a ...
observational requirements, feasability, expectations
... Activity time scale with COROT (visible light) : spots lifetime combined with rotation period (solar case not so simple; instrumental low frequency noise) No real law, even empirical, to estimate the activity time scale exploratory approach based on many stars and comparison to their rotation peri ...
... Activity time scale with COROT (visible light) : spots lifetime combined with rotation period (solar case not so simple; instrumental low frequency noise) No real law, even empirical, to estimate the activity time scale exploratory approach based on many stars and comparison to their rotation peri ...
Where Does Helium Come from?
... energy photon would not be able to create matter which is why all the matter in our Universe was created immediately after the Big Bang. Getting back to the formation of matter from energy, we are now able to see how pair production occurs due to the incredible energies surrounding the moment of the ...
... energy photon would not be able to create matter which is why all the matter in our Universe was created immediately after the Big Bang. Getting back to the formation of matter from energy, we are now able to see how pair production occurs due to the incredible energies surrounding the moment of the ...
Stars Of Orion Essay Research Paper 01
... In the center of the handle of the saucepan is a bright star, which is actually the Orion Nebula . In it, is a quartet of hot stars, which are known as the Trapezium, from their trapezoidal shape. The hottest of the Trapezium stars has a temperature of 30,000 Kelvin, and a luminosity of 300,000 time ...
... In the center of the handle of the saucepan is a bright star, which is actually the Orion Nebula . In it, is a quartet of hot stars, which are known as the Trapezium, from their trapezoidal shape. The hottest of the Trapezium stars has a temperature of 30,000 Kelvin, and a luminosity of 300,000 time ...
October 2014 - Newbury Astronomical Society
... naturally produces a very high temperature due to the compression of the Hydrogen gas. The fusion process that combines Hydrogen atoms to produce Helium and energy to heat the star proceeds at a ferocious rate and makes the star very hot so it will shine white or blue. This type of giant star will c ...
... naturally produces a very high temperature due to the compression of the Hydrogen gas. The fusion process that combines Hydrogen atoms to produce Helium and energy to heat the star proceeds at a ferocious rate and makes the star very hot so it will shine white or blue. This type of giant star will c ...
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.