Chapter 26: Stars, Galaxies, and the Universe Stars
... collapse shrinks the star's core to a white, glowing object about the size of Earth. A star at this point is called a white dwarf. Eventually, a white dwarf cools down and its light fades out. Supergiants and Supernovas A star that has much more mass than the Sun will end its life in a more dramatic ...
... collapse shrinks the star's core to a white, glowing object about the size of Earth. A star at this point is called a white dwarf. Eventually, a white dwarf cools down and its light fades out. Supergiants and Supernovas A star that has much more mass than the Sun will end its life in a more dramatic ...
Interstellar Space Not as Empty as you Might Think
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) All the heavy elements in the Earth were made in stars, then spent time in interst ...
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) All the heavy elements in the Earth were made in stars, then spent time in interst ...
Interstellar Space Not as Empty as you Might Think
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) ...
... Interstellar clouds are the start and end points of a star’s life. Dying stars release heavy elements back into interstellar space, which becomes richer and richer in heavy elements over time (its metallicity goes up) ...
Lesson Overviews and Content Standards
... galaxies students will move from the 1 to 10 billion scale model used with stars to one showing the size of the Milky Way in comparison to the spacing between galaxies in the Local Group. Images of our galactic neighbors are provided for the teacher to enrich the introduction to galaxies beyond our ...
... galaxies students will move from the 1 to 10 billion scale model used with stars to one showing the size of the Milky Way in comparison to the spacing between galaxies in the Local Group. Images of our galactic neighbors are provided for the teacher to enrich the introduction to galaxies beyond our ...
1705 Star Charts
... below them is the hook-shaped pattern of Scorpius with orange Antares marking the Scorpion's body. Below Antares, and brighter, is Saturn, rising in the southeast. Below Sirius are bluish Rigel and reddish Betelgeuse, the brightest stars in Orion. Between them is a line of three stars, Orion's belt. ...
... below them is the hook-shaped pattern of Scorpius with orange Antares marking the Scorpion's body. Below Antares, and brighter, is Saturn, rising in the southeast. Below Sirius are bluish Rigel and reddish Betelgeuse, the brightest stars in Orion. Between them is a line of three stars, Orion's belt. ...
P7 Further Physics : Observing the Universe
... The linear relationship between periodic time and intrinsic brightness for Cepheid variables, and they way this is used to measure distance to galaxies. The Curtis–Shapley debate as an example of how science explanations develop. The Hubble law quantitatively. ...
... The linear relationship between periodic time and intrinsic brightness for Cepheid variables, and they way this is used to measure distance to galaxies. The Curtis–Shapley debate as an example of how science explanations develop. The Hubble law quantitatively. ...
Astrophysics Questions (DRAFT)
... 94. Sketch a typical cooling function (T ) for di use interstellar gas and identify its prominent features. Overplot a hypothetical heating curve and show how to identify points of thermal equilibrium and their stability. 95. Explain the physics of 21 cm radio emission from neutral hydrogen atoms. ...
... 94. Sketch a typical cooling function (T ) for di use interstellar gas and identify its prominent features. Overplot a hypothetical heating curve and show how to identify points of thermal equilibrium and their stability. 95. Explain the physics of 21 cm radio emission from neutral hydrogen atoms. ...
OUR SOLAR SYSTEM
... for life, Earth, but in decades to come we may learn of others — perhaps biological enclaves on Mars or Jupiter’s moon Europa. Although our solar system likely is not unique in this respect, definitive evidence for life on worlds orbiting other stars will be harder to find. All told, the solar syste ...
... for life, Earth, but in decades to come we may learn of others — perhaps biological enclaves on Mars or Jupiter’s moon Europa. Although our solar system likely is not unique in this respect, definitive evidence for life on worlds orbiting other stars will be harder to find. All told, the solar syste ...
Here - SDSU Astronomy Department and Mount Laguna Observatory
... for 30 seconds. During that time, your eye would have taken 900 exposures, erasing everything at the start of each one. • Thus a 30 second exposure could potentially detect 900 times more photons than you would have seen with your eye, neglecting the different efficiencies in detection (film is less ...
... for 30 seconds. During that time, your eye would have taken 900 exposures, erasing everything at the start of each one. • Thus a 30 second exposure could potentially detect 900 times more photons than you would have seen with your eye, neglecting the different efficiencies in detection (film is less ...
v A v A
... (angular diameter of a dime 150 km away!) Can we resolve this small angle with a telescope? ...
... (angular diameter of a dime 150 km away!) Can we resolve this small angle with a telescope? ...
Weaknesses in Gravity and Cosmology Theories-19-06-11
... There was a peer pressure of competition between several scientists of that time, Poincaré and Lorentz being the most important ones. But instead of finding a theory that would have the bending of light and the perihelion advance of Mercury as applications of the theory, Einstein, with the help of M ...
... There was a peer pressure of competition between several scientists of that time, Poincaré and Lorentz being the most important ones. But instead of finding a theory that would have the bending of light and the perihelion advance of Mercury as applications of the theory, Einstein, with the help of M ...
natsci9+
... background radiation is fairly uniform. Opposite regions in the universe, which are not casually connected (the time it takes for light to traverse the distance is more than the age of the universe) have the same background radiation ...
... background radiation is fairly uniform. Opposite regions in the universe, which are not casually connected (the time it takes for light to traverse the distance is more than the age of the universe) have the same background radiation ...
Tutor Marked Assignment
... (b) What do you understand by Jeans criterion? Explain its role in the fragmentation of a ...
... (b) What do you understand by Jeans criterion? Explain its role in the fragmentation of a ...
Weaknesses in Gravity and Cosmology Theories-19-06-11
... There was a peer pressure of competition between several scientists of that time, Poincaré and Lorentz being the most important ones. But instead of finding a theory that would have the bending of light and the perihelion advance of Mercury as applications of the theory, Einstein, with the help of M ...
... There was a peer pressure of competition between several scientists of that time, Poincaré and Lorentz being the most important ones. But instead of finding a theory that would have the bending of light and the perihelion advance of Mercury as applications of the theory, Einstein, with the help of M ...
Quantitative constraints on starburst cycles in galaxies with stellar
... libraries contain models with burst fractions very close to zero, which are essentially identical to the models in the continuous library, so the new minimum χ2 is guaranteed to be equal to or smaller than the old one. If the new χ2min /Nd lies in the range 2.37-6.25, the probability that the model ...
... libraries contain models with burst fractions very close to zero, which are essentially identical to the models in the continuous library, so the new minimum χ2 is guaranteed to be equal to or smaller than the old one. If the new χ2min /Nd lies in the range 2.37-6.25, the probability that the model ...
PODEX – PhOtometric Data EXtractor
... The preferences of the actual session are controlled via the preference menu (click the Change Preferences button in the control field). There is also the possibility to import a set of preferences from a file (Load Preferences). The session preferences are: • FITS header keywords for date, Universa ...
... The preferences of the actual session are controlled via the preference menu (click the Change Preferences button in the control field). There is also the possibility to import a set of preferences from a file (Load Preferences). The session preferences are: • FITS header keywords for date, Universa ...
Goal: To understand how we know distances to various
... Apparent vs. absolute magnitudes • If you compare the apparent and absolute magnitudes of an object you get its distance. • How to do that? • 1) spectra – tells you what the mass of the star is by its temperature and its spectral type (although does not work so well for giants – works great for mai ...
... Apparent vs. absolute magnitudes • If you compare the apparent and absolute magnitudes of an object you get its distance. • How to do that? • 1) spectra – tells you what the mass of the star is by its temperature and its spectral type (although does not work so well for giants – works great for mai ...
http://hcs.harvard.edu/~jus/0302/bester.pdf
... 1941 image (Figure 2). We then divided each distance from the 1994 image by its corresponding distance on the 1941 image (Table 1). The resulting 8 ratios were not tightly distributed about the mean of the ratios. The largest differed by 3% from the smallest, which translates into a discrepancy of 3 ...
... 1941 image (Figure 2). We then divided each distance from the 1994 image by its corresponding distance on the 1941 image (Table 1). The resulting 8 ratios were not tightly distributed about the mean of the ratios. The largest differed by 3% from the smallest, which translates into a discrepancy of 3 ...
The Milky Way: Home to Star Clusters
... billions of galaxies scattered throughout the Universe, a large, but quite normal spiral galaxy in any sense of the word. On the other hand, it is the most important galaxy known, and is unique because it is the only place we know that harbours life. It is difficult to obtain a clear picture of the ...
... billions of galaxies scattered throughout the Universe, a large, but quite normal spiral galaxy in any sense of the word. On the other hand, it is the most important galaxy known, and is unique because it is the only place we know that harbours life. It is difficult to obtain a clear picture of the ...
Hubble Deep Field
The Hubble Deep Field (HDF) is an image of a small region in the constellation Ursa Major, constructed from a series of observations by the Hubble Space Telescope. It covers an area 2.5 arcminutes across, about one 24-millionth of the whole sky, which is equivalent in angular size to a 65 mm tennis ball at a distance of 100 metres. The image was assembled from 342 separate exposures taken with the Space Telescope's Wide Field and Planetary Camera 2 over ten consecutive days between December 18 and December 28, 1995.The field is so small that only a few foreground stars in the Milky Way lie within it; thus, almost all of the 3,000 objects in the image are galaxies, some of which are among the youngest and most distant known. By revealing such large numbers of very young galaxies, the HDF has become a landmark image in the study of the early universe, with the associated scientific paper having received over 900 citations by the end of 2014.Three years after the HDF observations were taken, a region in the south celestial hemisphere was imaged in a similar way and named the Hubble Deep Field South. The similarities between the two regions strengthened the belief that the universe is uniform over large scales and that the Earth occupies a typical region in the Universe (the cosmological principle). A wider but shallower survey was also made as part of the Great Observatories Origins Deep Survey. In 2004 a deeper image, known as the Hubble Ultra-Deep Field (HUDF), was constructed from a few months of light exposure. The HUDF image was at the time the most sensitive astronomical image ever made at visible wavelengths, and it remained so until the Hubble Extreme Deep Field (XDF) was released in 2012.