Our Galaxy, the Milky Way Galaxy
... Gas permeates the entire Milky Way Galaxy (and any other galaxy) o 75% atomic hydrogen (just hydrogen atoms) and 25% helium o Known as ISM (aka Interstellar Medium) o Gas does not even feel gravity (because it is so diffuse) o Gas is moving around randomly because of this o Radiation pressure is pus ...
... Gas permeates the entire Milky Way Galaxy (and any other galaxy) o 75% atomic hydrogen (just hydrogen atoms) and 25% helium o Known as ISM (aka Interstellar Medium) o Gas does not even feel gravity (because it is so diffuse) o Gas is moving around randomly because of this o Radiation pressure is pus ...
10 meters - Unlock Your Happiness
... 1 Millión light-years At this tremendous distance we can see the entire Via-Láctea (Milky Way) & other galáxies as well ... ...
... 1 Millión light-years At this tremendous distance we can see the entire Via-Láctea (Milky Way) & other galáxies as well ... ...
Stars and Light
... bright they looked to his eye. • Herschel (1800s) first measured the brightness of stars quantitatively and matched his measurements onto Ptolemy’s magnitude groups and assigned a number for the magnitude of each star. ...
... bright they looked to his eye. • Herschel (1800s) first measured the brightness of stars quantitatively and matched his measurements onto Ptolemy’s magnitude groups and assigned a number for the magnitude of each star. ...
Galaxies - Center for Astrostatistics
... We know Dark Matter is there (due to its effect on orbital velocity), but we don't know what it is! The existence and nature of dark matter was perhaps the greatest enigma of modern astronomy until ~2000, when we learned of an even greater enigma, Dark Energy. What could the dark matter be? Must hav ...
... We know Dark Matter is there (due to its effect on orbital velocity), but we don't know what it is! The existence and nature of dark matter was perhaps the greatest enigma of modern astronomy until ~2000, when we learned of an even greater enigma, Dark Energy. What could the dark matter be? Must hav ...
Lecture 1
... have smaller fingers -> larger angular measurements. A shorter person will have shorter arms -> smaller angular measurements. (Try to simulate this with your hand and arm!) Based on this, the answer is that we don’t expect them to have different angular measurements. ...
... have smaller fingers -> larger angular measurements. A shorter person will have shorter arms -> smaller angular measurements. (Try to simulate this with your hand and arm!) Based on this, the answer is that we don’t expect them to have different angular measurements. ...
Supplementary notes on Binary Star Masses
... out the projection. There are currently two basic ways to go about this: 1. Eclipsing Binaries: the fact it eclipses means that i≈90°, and careful observations of the eclipse timing can give more precise estimates. Most of the best-determined stellar masses come from observations of eclipsing binari ...
... out the projection. There are currently two basic ways to go about this: 1. Eclipsing Binaries: the fact it eclipses means that i≈90°, and careful observations of the eclipse timing can give more precise estimates. Most of the best-determined stellar masses come from observations of eclipsing binari ...
stars
... at the center of galaxies. These are extremely dense quantities of matter in space. They have such strong gravitational pulls that nothing – not even light – is fast enough to escape. 10 Mind-Bending Facts About Black Holes ...
... at the center of galaxies. These are extremely dense quantities of matter in space. They have such strong gravitational pulls that nothing – not even light – is fast enough to escape. 10 Mind-Bending Facts About Black Holes ...
doc - Jnoodle
... spherical radiation source and the imagined sphere at a distance d from the source - or strictly the center of the source - over which its inner imagined surface its radiation is spread) or vice versa. This method of relating distance d, apparent brightness b, absolute luminosity L, surface temperat ...
... spherical radiation source and the imagined sphere at a distance d from the source - or strictly the center of the source - over which its inner imagined surface its radiation is spread) or vice versa. This method of relating distance d, apparent brightness b, absolute luminosity L, surface temperat ...
CoRoT: a space project to listen to the songs of the stars
... CoRoT: a space satellite to listen to the songs of the stars CoRoT, an ambitious European space satellite, is going to be launched on December 27, 2006. Its main purpose is to study the interiors of the stars and to detect planets orbiting around the Sun-like stars (the acronym CoRoT stands for Conv ...
... CoRoT: a space satellite to listen to the songs of the stars CoRoT, an ambitious European space satellite, is going to be launched on December 27, 2006. Its main purpose is to study the interiors of the stars and to detect planets orbiting around the Sun-like stars (the acronym CoRoT stands for Conv ...
tut35 Magnitudes
... versus daylight sky’s 6.5 magnitude/arcsecond2 has sufficient contrast to be visible just before sunset or just after sunrise. The full Moon’s size and 3.6 magnitude/arcsecond2 makes for an easy daylight sighting. At greatest elongation, Venus’ magnitude/arcsecond2 is 1.9. The large contrast with th ...
... versus daylight sky’s 6.5 magnitude/arcsecond2 has sufficient contrast to be visible just before sunset or just after sunrise. The full Moon’s size and 3.6 magnitude/arcsecond2 makes for an easy daylight sighting. At greatest elongation, Venus’ magnitude/arcsecond2 is 1.9. The large contrast with th ...
Word Document - University of Iowa Astrophysics
... extract some rough numbers. This lab exercise does not require a formal writeup. Data taking, drawings, and calculations are to be entered on this form and handed to the teaching assistant. However, you need to preserve your results for later in the semester when you will measure angular sizes of ot ...
... extract some rough numbers. This lab exercise does not require a formal writeup. Data taking, drawings, and calculations are to be entered on this form and handed to the teaching assistant. However, you need to preserve your results for later in the semester when you will measure angular sizes of ot ...
Document
... • In the 3rd Century B.C., a Greek, Aristarchus of Samos, figured out a way to measure the relative sizes and distances of the Moon and Sun. • He noticed that when the Moon was eclipsed by the Earth (월식) we can see the Earth's shadow creep across the face of the Moon. Earth's shadow is circular, and ...
... • In the 3rd Century B.C., a Greek, Aristarchus of Samos, figured out a way to measure the relative sizes and distances of the Moon and Sun. • He noticed that when the Moon was eclipsed by the Earth (월식) we can see the Earth's shadow creep across the face of the Moon. Earth's shadow is circular, and ...
Sailing along River Eridani
... The constellation Eridanus sports a multitude of galaxies along its shoreline. They are like soft faint glows of light nestled against the dark riverside guiding us to stop at our first deep-sky object, NGC 1291 (Bennett 12) approximately 3.7 degrees ENE of Theta. A relatively bright medium to large ...
... The constellation Eridanus sports a multitude of galaxies along its shoreline. They are like soft faint glows of light nestled against the dark riverside guiding us to stop at our first deep-sky object, NGC 1291 (Bennett 12) approximately 3.7 degrees ENE of Theta. A relatively bright medium to large ...
New ultra faint dwarf galaxy candidates discovered with the Dark
... and why 'the closer the better?' There is an unexplained excess of gamma-ray (high energy photons, energies of 1-10GeV), coming from the Galactic center, as seen by the Fermi-GLAST gamma ray telescope (in space now). These gamma-rays may be due to dark matter particles, however, they may also be due ...
... and why 'the closer the better?' There is an unexplained excess of gamma-ray (high energy photons, energies of 1-10GeV), coming from the Galactic center, as seen by the Fermi-GLAST gamma ray telescope (in space now). These gamma-rays may be due to dark matter particles, however, they may also be due ...
Galaxies Galaxies M81
... Types of Galaxies I. Spirals Spiral galaxies are so-named because of the graceful shapes of arms emanating from a bright central nucleus. Spirals are classified according to how tightly or loosely wound the arms are, and it turns out that the brightness of the central nucleus is correlated to the t ...
... Types of Galaxies I. Spirals Spiral galaxies are so-named because of the graceful shapes of arms emanating from a bright central nucleus. Spirals are classified according to how tightly or loosely wound the arms are, and it turns out that the brightness of the central nucleus is correlated to the t ...
1. This question is about some of the properties of Barnard`s star
... The sketch-graph below shows the intensity spectrum for a black-body at a temperature of 6000 K. intensity ...
... The sketch-graph below shows the intensity spectrum for a black-body at a temperature of 6000 K. intensity ...
Ch.21 Stars, Galaxies, and the Universe Section 3: Lives of Stars
... High-mass stars quickly evolve into brilliant supergiants When a supergiant runs out of fuel, it can explode suddenly The supernovas can become part of a nebula This nebula can then contract to form a new, partly recycled star o Neutron Stars: are the remains of high-mass stars They are ev ...
... High-mass stars quickly evolve into brilliant supergiants When a supergiant runs out of fuel, it can explode suddenly The supernovas can become part of a nebula This nebula can then contract to form a new, partly recycled star o Neutron Stars: are the remains of high-mass stars They are ev ...
Stars, Galaxies, and the Universe
... After the big bang, matter in the universe separated into galaxies. Gas and dust spread throughout space in our galaxy. About 5 billion years ago, a giant cloud of gas and dust, or nebula, collapsed to form the solar system. Nebula shrank to form a disk = the sun was born. The spheres closest to the ...
... After the big bang, matter in the universe separated into galaxies. Gas and dust spread throughout space in our galaxy. About 5 billion years ago, a giant cloud of gas and dust, or nebula, collapsed to form the solar system. Nebula shrank to form a disk = the sun was born. The spheres closest to the ...
N-Body Simulations of Star Clusters with IMBH
... Matsumoto et al. (2001) for example found a bright X-ray source at the center of the starburst galaxy M82 with an Eddington luminosity corresponding to a black hole of several hundred solar masses. Optical follow-up observations showed that the position of this source coincides with that of a young ...
... Matsumoto et al. (2001) for example found a bright X-ray source at the center of the starburst galaxy M82 with an Eddington luminosity corresponding to a black hole of several hundred solar masses. Optical follow-up observations showed that the position of this source coincides with that of a young ...
How Telescopes Changed our Universe
... Big Question 7: Are there other planets? In our own solar system, telescopes found planets our eyes could not see. Are there other planets outside of our solar system? ...
... Big Question 7: Are there other planets? In our own solar system, telescopes found planets our eyes could not see. Are there other planets outside of our solar system? ...
Astronomy Unit Outline
... demonstrate an understanding of the origin and evolution of the universe, the principal characteristics of its components, and techniques used to study those components. ...
... demonstrate an understanding of the origin and evolution of the universe, the principal characteristics of its components, and techniques used to study those components. ...
The classification of stellar spectra
... •IV: subgiants •V: main sequence •For stars of given temperature, brighter luminosity classes (“giants”) have narrower lines; spectral type and luminosity class locates star in H-R diagram ...
... •IV: subgiants •V: main sequence •For stars of given temperature, brighter luminosity classes (“giants”) have narrower lines; spectral type and luminosity class locates star in H-R diagram ...
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.