Super Giant
... Radiation, particles and energy leftover by the initial Big Bang. Not only found in NJ but Princeton NJ also used this background radiation to date the universe’s age at 13.725 billion years old! ...
... Radiation, particles and energy leftover by the initial Big Bang. Not only found in NJ but Princeton NJ also used this background radiation to date the universe’s age at 13.725 billion years old! ...
PH607lec10
... Because of cool interstellar dust along the line of sight, the Galactic Centre cannot be studied at visible, ultraviolet or soft Xray wavelengths. The available information about the Galactic Center comes from observations at gamma ray, hard X-ray, infrared, sub-millimetre and radio wavelengths. ...
... Because of cool interstellar dust along the line of sight, the Galactic Centre cannot be studied at visible, ultraviolet or soft Xray wavelengths. The available information about the Galactic Center comes from observations at gamma ray, hard X-ray, infrared, sub-millimetre and radio wavelengths. ...
ppt
... • Somewhat in the outskirts… • 25,000 ly away from the center • Moving at about 200 km/s around the center of the Milky Way • TRUMPLER’s (1930) discovery of dust ...
... • Somewhat in the outskirts… • 25,000 ly away from the center • Moving at about 200 km/s around the center of the Milky Way • TRUMPLER’s (1930) discovery of dust ...
teachers version.
... Teacher Information: This question is designed to give students a sense of how physicists can say when the universe started. It is also designed to make them appreciate that using powers of ten can actually make problems easier. 0.78 x 109 light-years x 9.5 x 1015 m/light-year = 7.4 x 1024 m. b) How ...
... Teacher Information: This question is designed to give students a sense of how physicists can say when the universe started. It is also designed to make them appreciate that using powers of ten can actually make problems easier. 0.78 x 109 light-years x 9.5 x 1015 m/light-year = 7.4 x 1024 m. b) How ...
What are the Spectral Lines? - University of Texas Astronomy Home
... - real knowledge only due to hard facts, e.g., laboratory science, measurements • claimed ...
... - real knowledge only due to hard facts, e.g., laboratory science, measurements • claimed ...
nasafinal - University of Oregon
... redshift (i.e. when they were young). In principle, these XUV structures are suggesting that galaxies can’t be as big as we think they are, when we observe them at high redshift. ...
... redshift (i.e. when they were young). In principle, these XUV structures are suggesting that galaxies can’t be as big as we think they are, when we observe them at high redshift. ...
Basic Properties of Stars
... 1905 - amateur astronomer, Hertzsprung, found a correlation between spectral type and absolute magnitude - but stars G and later showed a range in MV for same spectral type - brighter stars called “giants”. ...
... 1905 - amateur astronomer, Hertzsprung, found a correlation between spectral type and absolute magnitude - but stars G and later showed a range in MV for same spectral type - brighter stars called “giants”. ...
AST1001.ch1
... in the local Solar neighborhood… • at 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… • at typical relative speeds of more than 70,000 km/hr. • but stars are so far away that we cannot easily notice ...
Lecture 10
... Several groups have monitored stars in the Galactic bulge and the Magellanic clouds to detect lensing of these stars by foreground objects (MACHO, EROS, MOA, OGLE projects). Original motivation for these projects was to search for dark matter in the form of compact objects in the halo. Timescales f ...
... Several groups have monitored stars in the Galactic bulge and the Magellanic clouds to detect lensing of these stars by foreground objects (MACHO, EROS, MOA, OGLE projects). Original motivation for these projects was to search for dark matter in the form of compact objects in the halo. Timescales f ...
A Star is
... • Blue stars have average surface temperatures of 35,000˚C. • Red stars have average surface temperatures of 3,000˚C. • Yellow stars, such as the sun, have surface temperatures of about 5,500˚C. ...
... • Blue stars have average surface temperatures of 35,000˚C. • Red stars have average surface temperatures of 3,000˚C. • Yellow stars, such as the sun, have surface temperatures of about 5,500˚C. ...
Final Exam, Dec. 19, 2015 - Physics@Brock
... (b) Yellow. (c) Red. 26. A star that is hot and dim must have (a) a very great distance. (b) a very small mass. (c) a very small radius. (d) a very large radius. 27. Stars with masses in excess of 50 solar masses are not very common. (a) True. (b) False. 28. The spectroscopic binaries are detected ( ...
... (b) Yellow. (c) Red. 26. A star that is hot and dim must have (a) a very great distance. (b) a very small mass. (c) a very small radius. (d) a very large radius. 27. Stars with masses in excess of 50 solar masses are not very common. (a) True. (b) False. 28. The spectroscopic binaries are detected ( ...
The Big Bang Theory
... • Spectral lines: Each element produces its own bar code when it emits visible light (dark lines in the spectrum). • Hubble studied the light of stars and determined which elements they contain by analyzing their spectral lines. ...
... • Spectral lines: Each element produces its own bar code when it emits visible light (dark lines in the spectrum). • Hubble studied the light of stars and determined which elements they contain by analyzing their spectral lines. ...
Topic 6 Introduction
... – What is true is that the inner heavy element burning layers of the star must be expelled at high velocity with some shock mechanism or else material would continue to fall back into the neutron star and a black hole would form – As the shock passes through new fusion takes place and much 56Ni is ...
... – What is true is that the inner heavy element burning layers of the star must be expelled at high velocity with some shock mechanism or else material would continue to fall back into the neutron star and a black hole would form – As the shock passes through new fusion takes place and much 56Ni is ...
Universe of Learning Science Briefing: Our Home, the Milky Way
... Going from 2d to 3d : Turning Pictures into a Galactic Map There are no rulers that can be observed in our Galaxy. But there are types of stars called Red Clump Giants for which we know the intrinsic brightness. They are also fairly common and bright and can be used to trace the structure of the Ga ...
... Going from 2d to 3d : Turning Pictures into a Galactic Map There are no rulers that can be observed in our Galaxy. But there are types of stars called Red Clump Giants for which we know the intrinsic brightness. They are also fairly common and bright and can be used to trace the structure of the Ga ...
The Sun and Stars The Sun is a typical star with a mass of about 2
... I is measured in Watt/m2 . So, a star that is 10 times farther away appears 100 time less bright. The brightness is sometimes expressed not in Watt/m2 but in magnitudes. The magnitude of Sirius (the brightest star in our sky) is -1.46, of Canopus -0.72, of Vega 0.04, of Deneb 1.26,. . . more or less ...
... I is measured in Watt/m2 . So, a star that is 10 times farther away appears 100 time less bright. The brightness is sometimes expressed not in Watt/m2 but in magnitudes. The magnitude of Sirius (the brightest star in our sky) is -1.46, of Canopus -0.72, of Vega 0.04, of Deneb 1.26,. . . more or less ...
The resolved stellar populations of M32 Monachesi, Antonela
... of variable stars, called RR Lyrae. These stars show regular light variations which occur because they pulsate radially, i.e. periodic variations in the radius of RR Lyrae stars produce changes in their brightnesses. Due to the fact that these stars pulsate regularly, their light curve (light variat ...
... of variable stars, called RR Lyrae. These stars show regular light variations which occur because they pulsate radially, i.e. periodic variations in the radius of RR Lyrae stars produce changes in their brightnesses. Due to the fact that these stars pulsate regularly, their light curve (light variat ...
Document
... The observation that there are few spiral galaxies in areas of high galaxy density. ...
... The observation that there are few spiral galaxies in areas of high galaxy density. ...
LIGHT VS. DISTANCE
... Inverse Square Law The brightness of an object varies inversely as the square of the distance. This is a geometric consequence of the fact that light moves outward in a spherical fashion. ...
... Inverse Square Law The brightness of an object varies inversely as the square of the distance. This is a geometric consequence of the fact that light moves outward in a spherical fashion. ...
Stars: some basic characteristics
... The reason that O- and B-type stars have few absorption lines is that they are very hot. There is so much thermal energy in their atmospheres that most of the elements become ionized; if the electrons aren’t attached to nuclei, then they can’t transition between energy levels and so they can’t ...
... The reason that O- and B-type stars have few absorption lines is that they are very hot. There is so much thermal energy in their atmospheres that most of the elements become ionized; if the electrons aren’t attached to nuclei, then they can’t transition between energy levels and so they can’t ...
27DarkMatter
... based on where we see the light coming from • Most astronomers feel that the latter is more likely, hence we believe that galaxies are filled with some unknown type of dark matter – The dark matter is NOT just where the stars are, it must fill a much larger volume of space – How much is there? A LOT ...
... based on where we see the light coming from • Most astronomers feel that the latter is more likely, hence we believe that galaxies are filled with some unknown type of dark matter – The dark matter is NOT just where the stars are, it must fill a much larger volume of space – How much is there? A LOT ...
Testing Your Sky
... takes on a white, milky appearance. Under such conditions sky watching at night is not very fruitful, especially is one is attempting to view dim space objects. Though there is no way of directly measuring transparency, it can at least be estimated by viewing the sky by day. Transparency will advers ...
... takes on a white, milky appearance. Under such conditions sky watching at night is not very fruitful, especially is one is attempting to view dim space objects. Though there is no way of directly measuring transparency, it can at least be estimated by viewing the sky by day. Transparency will advers ...
How Old is the Universe?
... For the meteorites, the oldest are 4.56 billion years old. This very well determined age is the age of the Solar System. ...
... For the meteorites, the oldest are 4.56 billion years old. This very well determined age is the age of the Solar System. ...
Extra-Solar Life: Habitable Zones
... for life, then there is a limited volume of any stellar system where that might exist – the Habitable Zone • If we assume temperature is dominated by sun/starlight, then the HZ can be calculated for any given star • Likely star types for life are F, G, and K stars (bigger stars die fast; M stars hav ...
... for life, then there is a limited volume of any stellar system where that might exist – the Habitable Zone • If we assume temperature is dominated by sun/starlight, then the HZ can be calculated for any given star • Likely star types for life are F, G, and K stars (bigger stars die fast; M stars hav ...
The Milky Way Galaxy is Heading for a Major Cosmic Collision
... 2.5 million light years away Similar to Milky Way (shape, size, mass) One of few galaxies that can be seen with naked eye First described by astronomers >1000 years ago ...
... 2.5 million light years away Similar to Milky Way (shape, size, mass) One of few galaxies that can be seen with naked eye First described by astronomers >1000 years ago ...
Cosmic Dawn A Hunting for the First Stars in the Universe
... The tendrils of the web are filled with tenuous gas that does not shine on its own. However, we can still measure its properties by seeing how it influences light traveling through from faraway sources. The background object of choice for these observations is a quasar, an unusually active galaxy cont ...
... The tendrils of the web are filled with tenuous gas that does not shine on its own. However, we can still measure its properties by seeing how it influences light traveling through from faraway sources. The background object of choice for these observations is a quasar, an unusually active galaxy cont ...
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.