Module code: AA1
... The hypothetical question how the night sky would appear if all stars would possess the same luminosity as the sun or Barnard’s star was analysed with Excel diagrams leading to the conclusion that in case of the sun the night sky would have less bright stars and in case of Barnard’s star with the na ...
... The hypothetical question how the night sky would appear if all stars would possess the same luminosity as the sun or Barnard’s star was analysed with Excel diagrams leading to the conclusion that in case of the sun the night sky would have less bright stars and in case of Barnard’s star with the na ...
HEIC0007 Photo release: Stephan`s Quintet
... finally resolved. Hubble's resolution is so high that individual stars can be discerned in NGC 7320, showing that it is definitely closer than the more remote, compact group of galaxies. Today other measurements have also shown that the galaxies NGC 7320C and NGC 7318B are just passing and are not b ...
... finally resolved. Hubble's resolution is so high that individual stars can be discerned in NGC 7320, showing that it is definitely closer than the more remote, compact group of galaxies. Today other measurements have also shown that the galaxies NGC 7320C and NGC 7318B are just passing and are not b ...
21_LectureOutline
... The Crab nebula is a remnant from a supernova explosion that occurred in the year 1054. ...
... The Crab nebula is a remnant from a supernova explosion that occurred in the year 1054. ...
Distance, Size, and Temperature of a Star
... way. They grow larger just like the Sun sized stars, but then instead of shrinking and forming a planetary nebula they explode in what is called a super nova. Super nova explosions can be brighter than an entire galaxy, and can be seen from very far away. Because blue giant stars only live a short t ...
... way. They grow larger just like the Sun sized stars, but then instead of shrinking and forming a planetary nebula they explode in what is called a super nova. Super nova explosions can be brighter than an entire galaxy, and can be seen from very far away. Because blue giant stars only live a short t ...
Clusters - El Camino College
... “Galactic clusters” – though this is a bit of a misnomer now as discussed below). Open clusters usually don't contain enough stars to hold on to each other gravitationally (most of the mass of the cloud was dispersed by the light from luminous stars). They contain a few dozen to a few thousand stars ...
... “Galactic clusters” – though this is a bit of a misnomer now as discussed below). Open clusters usually don't contain enough stars to hold on to each other gravitationally (most of the mass of the cloud was dispersed by the light from luminous stars). They contain a few dozen to a few thousand stars ...
ISP 205: Visions of the Universe
... in the local Solar neighborhood… • typical relative speeds of more than 70,000 km/hr • but stars are so far away that we cannot easily notice ...
... in the local Solar neighborhood… • typical relative speeds of more than 70,000 km/hr • but stars are so far away that we cannot easily notice ...
lecture27
... What does careful study of our Milky Way Galaxy tell us about galaxy formation? • The Milky Way’s halo stars are very old and their orbits have random orientations, suggesting that they did indeed form before the protogalactic cloud collapsed into a disk. The low abundances of heavy elements in halo ...
... What does careful study of our Milky Way Galaxy tell us about galaxy formation? • The Milky Way’s halo stars are very old and their orbits have random orientations, suggesting that they did indeed form before the protogalactic cloud collapsed into a disk. The low abundances of heavy elements in halo ...
The Properties of Stars Early in its history, the universe organized
... Stars are not scattered evenly over the H-R diagram; instead, they tend to appear in groups. One such group runs from the lower-right-hand corner (cool, lowluminosity stars) to the upper-left-hand corner (hot, high-luminosity stars). This should seem quite reasonable; in general, stars with hotter s ...
... Stars are not scattered evenly over the H-R diagram; instead, they tend to appear in groups. One such group runs from the lower-right-hand corner (cool, lowluminosity stars) to the upper-left-hand corner (hot, high-luminosity stars). This should seem quite reasonable; in general, stars with hotter s ...
Dark matter
... “invisible matter”. The properties of invisible objects are rather difficult to determine. We know dark matter exists because of its gravitational pull on luminous matter; otherwise, information is lacking. ...
... “invisible matter”. The properties of invisible objects are rather difficult to determine. We know dark matter exists because of its gravitational pull on luminous matter; otherwise, information is lacking. ...
NuSeti-2015 - Department of Physics and Astronomy
... 6.3 PeV. The cross-section on electrons in detectors is large and characteristic of the Glashow Resonance (produce on-shell W with a resultant shower). No BG and a unique ...
... 6.3 PeV. The cross-section on electrons in detectors is large and characteristic of the Glashow Resonance (produce on-shell W with a resultant shower). No BG and a unique ...
A new formula for the rotation velocity – and density distribution of a
... visible part of the galaxy Ostriker et al. (4) and Einasto et al. (5). They found that M increased linearly with R out to at least 100 kpc. They now believe that around 90% of the mass in a spiral galaxy consist of dark and invisible matter, Rubin (6),with a mass to light (luminosity) ratio in solar ...
... visible part of the galaxy Ostriker et al. (4) and Einasto et al. (5). They found that M increased linearly with R out to at least 100 kpc. They now believe that around 90% of the mass in a spiral galaxy consist of dark and invisible matter, Rubin (6),with a mass to light (luminosity) ratio in solar ...
Astro Review - Blank - Mayfield City Schools
... 3. ___d_ apparent shift toward shorter wavelengths of light when a luminous object moves toward the Viewer 5. ___a_ sum of all space, matter and energy 6. ___g_ matter not visible through current methods, but observable through gravitational interactions between galaxies 7. ___b_ apparent shift towa ...
... 3. ___d_ apparent shift toward shorter wavelengths of light when a luminous object moves toward the Viewer 5. ___a_ sum of all space, matter and energy 6. ___g_ matter not visible through current methods, but observable through gravitational interactions between galaxies 7. ___b_ apparent shift towa ...
How is Light Made?
... • Hotter stars emit more light at all wavelengths through each unit area of its surface – luminosity is proportional to T4 ⇒ small increase in temperature makes a big increase in luminosity ...
... • Hotter stars emit more light at all wavelengths through each unit area of its surface – luminosity is proportional to T4 ⇒ small increase in temperature makes a big increase in luminosity ...
20_Testbank
... distances to the nearest stars. The Hyades is an open cluster whose stars are near enough to us that their distances can be measured with stellar parallax. This gives us a cluster of stars that we can plot on an H-R diagram to determine the luminosity of the main sequence. For more distant clusters, ...
... distances to the nearest stars. The Hyades is an open cluster whose stars are near enough to us that their distances can be measured with stellar parallax. This gives us a cluster of stars that we can plot on an H-R diagram to determine the luminosity of the main sequence. For more distant clusters, ...
Tutorial: Luminosity
... However, the “brightness” of a star decreases as one moves farther and farther away. If a sphere of radius d is drawn around the star, it should be clear that the energy/sec through the surface of this sphere is the same as the energy/sec emitted through the surface of the star, since there is no me ...
... However, the “brightness” of a star decreases as one moves farther and farther away. If a sphere of radius d is drawn around the star, it should be clear that the energy/sec through the surface of this sphere is the same as the energy/sec emitted through the surface of the star, since there is no me ...
Right Ascension
... luminosities, we can also find out their radii. There turns out to be a very large range. The largest stars are bigger than Earth's orbit, while the smallest are only a few kilometres across. ...
... luminosities, we can also find out their radii. There turns out to be a very large range. The largest stars are bigger than Earth's orbit, while the smallest are only a few kilometres across. ...
The Sculptor dwarf irregular galaxy SDIG: present and past
... The internal extinction in SDIG is unknown. Based on model fits to optical surface brightness profiles, we conclude that the peak colour excess owing to internal dust is less than 0.08 mag, and this is within the central region covering a few arcseconds (Section 4.2.2). Given the many assumptions, t ...
... The internal extinction in SDIG is unknown. Based on model fits to optical surface brightness profiles, we conclude that the peak colour excess owing to internal dust is less than 0.08 mag, and this is within the central region covering a few arcseconds (Section 4.2.2). Given the many assumptions, t ...
Star Composition: Flame Testing Lab S-2
... 8th grade science standards: b. Students know that the Sun is one of many stars in the Milky Way galaxy and that stars may differ in size, temperature, and color. d. Students know that stars are the source of light for all bright objects in outer space and that the Moon and planets shine by reflecte ...
... 8th grade science standards: b. Students know that the Sun is one of many stars in the Milky Way galaxy and that stars may differ in size, temperature, and color. d. Students know that stars are the source of light for all bright objects in outer space and that the Moon and planets shine by reflecte ...
Galaxy Notes
... from the central bulge. The Milky Way is a spiral galaxy. Like pinwheels, all spiral galaxies rotate -- but slowly. The Milky Way, for example, makes a complete revolution once every 250 million years or so. New stars are constantly forming out of gas and dust in spiral galaxies. Smaller groups of s ...
... from the central bulge. The Milky Way is a spiral galaxy. Like pinwheels, all spiral galaxies rotate -- but slowly. The Milky Way, for example, makes a complete revolution once every 250 million years or so. New stars are constantly forming out of gas and dust in spiral galaxies. Smaller groups of s ...
COM 2014 January
... King Acrisius of Argos was warned by an oracle that one day he would be killed by his own grandson. To prevent any likelihood of this ever happening, he locked away his beautiful daughter, Danae, so that no man could ever reach her. But this did not stop the god Zeus, with his fondness for mortal wo ...
... King Acrisius of Argos was warned by an oracle that one day he would be killed by his own grandson. To prevent any likelihood of this ever happening, he locked away his beautiful daughter, Danae, so that no man could ever reach her. But this did not stop the god Zeus, with his fondness for mortal wo ...
How do the most massive galaxies constrain theories of
... Why are red galaxies red? o CDM models produce enough old, massive galaxies. the problem is a continuous ‘trickle’ of star formation o there must be some process that shuts off star formation after galaxies have become massive o this process must be rapid, and seems to be connected with the presenc ...
... Why are red galaxies red? o CDM models produce enough old, massive galaxies. the problem is a continuous ‘trickle’ of star formation o there must be some process that shuts off star formation after galaxies have become massive o this process must be rapid, and seems to be connected with the presenc ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.