The Spiral Structure of the Milky Way
... Mapping The Spiral Arms Of The Milky Way Starting point: Map the intensity of neutral hydrogen along the Galactic plane for various Galactic longitudes. As a result of this procedure, it has been shown that the neutral hydrogen appears to be concentrated in the spiral arms of the Milky Way. ...
... Mapping The Spiral Arms Of The Milky Way Starting point: Map the intensity of neutral hydrogen along the Galactic plane for various Galactic longitudes. As a result of this procedure, it has been shown that the neutral hydrogen appears to be concentrated in the spiral arms of the Milky Way. ...
Distance - courses.psu.edu
... 4. Jupiter's moon Europa, which effectively lies at the same distance from the Sun as Jupiter (5.2 AU) receives how much sunlight per square meter, relative to the amount received by Earth? 5. a) In the distant future, the sun will likely become 100 times more luminous than at present (when it expan ...
... 4. Jupiter's moon Europa, which effectively lies at the same distance from the Sun as Jupiter (5.2 AU) receives how much sunlight per square meter, relative to the amount received by Earth? 5. a) In the distant future, the sun will likely become 100 times more luminous than at present (when it expan ...
Chapter 20
... arisen not only on the Earth but also in other locations. The appearance of very simple organisms in Earth rocks that are 3.5 billion years old, and indirect evidence for life as far back as 3.8 billion years (not long after the end of the bombardment suffered by the newly formed Earth), suggests th ...
... arisen not only on the Earth but also in other locations. The appearance of very simple organisms in Earth rocks that are 3.5 billion years old, and indirect evidence for life as far back as 3.8 billion years (not long after the end of the bombardment suffered by the newly formed Earth), suggests th ...
Doubly Ionized Carbon Observed in the Plasma Tail of Comet Kudo
... give QH ⫽ 1.1 ⫻ 1030 s⫺1 at the time of the first crossing, increasing to 5.3 ⫻ 1030 s⫺1 by the last crossing. These numbers correspond to water outgassing rates of 5.5 ⫻ 1029 s⫺1 to 2.65 ⫻ 1030 s⫺1. The model can be modified to use the radiance of the H I Ly  102.6-nm line instead, allowing us to ...
... give QH ⫽ 1.1 ⫻ 1030 s⫺1 at the time of the first crossing, increasing to 5.3 ⫻ 1030 s⫺1 by the last crossing. These numbers correspond to water outgassing rates of 5.5 ⫻ 1029 s⫺1 to 2.65 ⫻ 1030 s⫺1. The model can be modified to use the radiance of the H I Ly  102.6-nm line instead, allowing us to ...
The Bigger Picture
... 100 parsecs --- this is a parallax angle of only 0.01 arcseconds! • Space-based missions have taken over parallax measurements. A satellite called Hipparcos measured parallaxes for about 100,000 stars (pre-Hipparcos, this number was more like 2000 stars). ...
... 100 parsecs --- this is a parallax angle of only 0.01 arcseconds! • Space-based missions have taken over parallax measurements. A satellite called Hipparcos measured parallaxes for about 100,000 stars (pre-Hipparcos, this number was more like 2000 stars). ...
The Stellar Cycle
... itself surrounded by a shell of hydrogen undergoing nuclear fusion. For a star with M< 1 Msun, the carbon core never gets hot enough to ignite nuclear fusion. In very massive stars, elements can be fused into Fe. U6_StarLife ...
... itself surrounded by a shell of hydrogen undergoing nuclear fusion. For a star with M< 1 Msun, the carbon core never gets hot enough to ignite nuclear fusion. In very massive stars, elements can be fused into Fe. U6_StarLife ...
22_SN1987a
... • A shock wave rebounds through the outer layers of the star: some of the neutrons fly out through the ejecta and make heavy elements by 56Fe + Nn 56+NX • The core continues to collapse: it either halts as a stable neutron star or becomes a black hole depending upon the mass remaining in the core ...
... • A shock wave rebounds through the outer layers of the star: some of the neutrons fly out through the ejecta and make heavy elements by 56Fe + Nn 56+NX • The core continues to collapse: it either halts as a stable neutron star or becomes a black hole depending upon the mass remaining in the core ...
Photometric analysis of the globular cluster NGC5466
... open clusters and globular clusters. Open clusters do not have a regular shape and have from few tens to 103 stars, losely bound to each others, which are spread in a very large space; therefore, their density is low. The population of open clusters is quite young and some bright blue stars are iden ...
... open clusters and globular clusters. Open clusters do not have a regular shape and have from few tens to 103 stars, losely bound to each others, which are spread in a very large space; therefore, their density is low. The population of open clusters is quite young and some bright blue stars are iden ...
4.1 Introduction 4.2 Visual Binaries
... When two stars in a binary system are too far away to be resolved even with the largest telescopes on Earth, the binarity of the system can still be inferred from consideration of the spectrum, which will be the superposition of two set of spectral features (which may be different if the stars are o ...
... When two stars in a binary system are too far away to be resolved even with the largest telescopes on Earth, the binarity of the system can still be inferred from consideration of the spectrum, which will be the superposition of two set of spectral features (which may be different if the stars are o ...
summary lecture
... Big Bang and 3K background radiation WMAP yields cosmological parameters: shape, density, fate? of universe ...
... Big Bang and 3K background radiation WMAP yields cosmological parameters: shape, density, fate? of universe ...
File - We All Love Science
... light loses some energy (while still traveling at the speed of light, which is a constant) – Longer, stretched wavelengths correspond to red ...
... light loses some energy (while still traveling at the speed of light, which is a constant) – Longer, stretched wavelengths correspond to red ...
2. The Universe Is Expanding and Evolving
... towards) us. By 1929 it was clear that almost all of the galaxies are moving away from us, and that the speed of recession (the redshift) increases with the distance to the galaxy. This became known as Hubble’s Law. The expansion of the universe had been discovered. When Einstein heard about this, h ...
... towards) us. By 1929 it was clear that almost all of the galaxies are moving away from us, and that the speed of recession (the redshift) increases with the distance to the galaxy. This became known as Hubble’s Law. The expansion of the universe had been discovered. When Einstein heard about this, h ...
Chapter 4 Section 1 The Development of a New Atomic Model
... • The lowest energy state of an atom is its ground state. • A state in which an atom has a higher potential energy than it has in its ground state is an excited state. ...
... • The lowest energy state of an atom is its ground state. • A state in which an atom has a higher potential energy than it has in its ground state is an excited state. ...
numerical exercises
... (M3 for cool stars), so the mass-to-light ratio should vary as M/L ~ 1/M3 or 1/M2. The typical star near the Sun is a cool M-dwarf with a mass of only 0.25 M or less, implying a typical mass-to-light ratio for our Galaxy of ~16. Since most stars are probably less massive than that, the actual mass- ...
... (M3 for cool stars), so the mass-to-light ratio should vary as M/L ~ 1/M3 or 1/M2. The typical star near the Sun is a cool M-dwarf with a mass of only 0.25 M or less, implying a typical mass-to-light ratio for our Galaxy of ~16. Since most stars are probably less massive than that, the actual mass- ...
Sample Test Ch 23-28
... C) Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object. D) Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source. E) Yes, ...
... C) Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object. D) Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source. E) Yes, ...
Supernovae and cosmology
... Intensity differs among type Ia supernovae Change of luminosty depends on intensity Find the distance from intensity. Relatively precise measurement ...
... Intensity differs among type Ia supernovae Change of luminosty depends on intensity Find the distance from intensity. Relatively precise measurement ...
Chapter 6. - Department of Physics & Astronomy
... => The telescope aperture produces fringe rings that set a limit to the resolution of the telescope. Astronomers can’t eliminate these diffraction fringes, but the larger a telescope is in diameter, the smaller the diffraction fringes are. Thus the larger the telescope, the better its resolving powe ...
... => The telescope aperture produces fringe rings that set a limit to the resolution of the telescope. Astronomers can’t eliminate these diffraction fringes, but the larger a telescope is in diameter, the smaller the diffraction fringes are. Thus the larger the telescope, the better its resolving powe ...
Star - Astrophysics
... around the forming star,potentially detectable as an infra-red source. We may also observe bipolar molecular outflows from young stellar objects (YSOs). Denser knots in these outflows are called Herbig-Haro objects. Once the surrounding gas and dust is burned off we see a T Tauri star. [Fig. 59:Infr ...
... around the forming star,potentially detectable as an infra-red source. We may also observe bipolar molecular outflows from young stellar objects (YSOs). Denser knots in these outflows are called Herbig-Haro objects. Once the surrounding gas and dust is burned off we see a T Tauri star. [Fig. 59:Infr ...
Department: Physics Course number: 1020Q Course title
... The students taking the course do acquire intellectual breadth and versatility. Students are expected to acquire knowledge about astronomical phenomena, and basic physics laws determining the behavior of electromagnetic waves, bodies moving under the influence of gravity from planetary moons to gala ...
... The students taking the course do acquire intellectual breadth and versatility. Students are expected to acquire knowledge about astronomical phenomena, and basic physics laws determining the behavior of electromagnetic waves, bodies moving under the influence of gravity from planetary moons to gala ...
Lec10
... • As far as we know, gravity crushes all the matter into a single point known as a singularity. ...
... • As far as we know, gravity crushes all the matter into a single point known as a singularity. ...
Revision exam - Dynamic Science
... 24) Drag is the force that : a) resists motion through the air and increases with speed; b) lifts the rocket off the launch-pad and increases with increase in thrust; c) opposes the pull of gravity and its strength increases with speed; d) works against the rocket moving through the air and decreas ...
... 24) Drag is the force that : a) resists motion through the air and increases with speed; b) lifts the rocket off the launch-pad and increases with increase in thrust; c) opposes the pull of gravity and its strength increases with speed; d) works against the rocket moving through the air and decreas ...
The density of very massive evolved galaxies to z≃ 1.7
... of our spectroscopic observations (13 spectra collected out of the 19 EROs in the field). In order to compare these densities with the local values, we integrated the K-band luminosity function (LF) of local early-type galaxies, derived by Kochanek et al. (2001), described by M ∗ K = −24.3 ± 0.06 an ...
... of our spectroscopic observations (13 spectra collected out of the 19 EROs in the field). In order to compare these densities with the local values, we integrated the K-band luminosity function (LF) of local early-type galaxies, derived by Kochanek et al. (2001), described by M ∗ K = −24.3 ± 0.06 an ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.