Chapter 15
... A number of Earthlike planets have now been observed, although due to detection difficulties most exoplanets still fall into the “hot Jupiter” category, making other planetary systems look quite different from our own. Until we are able to observe much smaller planets at much larger distances from t ...
... A number of Earthlike planets have now been observed, although due to detection difficulties most exoplanets still fall into the “hot Jupiter” category, making other planetary systems look quite different from our own. Until we are able to observe much smaller planets at much larger distances from t ...
1.1 Fundamental Observers
... Photons interact with baryons and electrons. Photons are absorbed/emitted when electrons move between energy levels within an atom (thus giving us the absorption/emission lines which we use to measure the redshifts of galaxies). Photons can ionise atoms by imparting sufficient energy to electrons. P ...
... Photons interact with baryons and electrons. Photons are absorbed/emitted when electrons move between energy levels within an atom (thus giving us the absorption/emission lines which we use to measure the redshifts of galaxies). Photons can ionise atoms by imparting sufficient energy to electrons. P ...
Chapter 30 Notes
... As the planetary nebula disperses; gravity causes the remaining matter in the star to collapse inward until it cannot be pressed further together. A hot, extremely dense core of matter is left behind. This mass is called a white dwarf and can shine for billions of years before it cools completely. S ...
... As the planetary nebula disperses; gravity causes the remaining matter in the star to collapse inward until it cannot be pressed further together. A hot, extremely dense core of matter is left behind. This mass is called a white dwarf and can shine for billions of years before it cools completely. S ...
Distance Between Stars - cK-12
... • parallax: A method used by astronomers to calculate the distance to nearby stars, using the apparent shift relative to distant stars. ...
... • parallax: A method used by astronomers to calculate the distance to nearby stars, using the apparent shift relative to distant stars. ...
galctr
... • Turbulence not internally-driven since structure is dominated by large-scale filaments - swept up [but see movie -- gravity can produce filaments too] • Filaments have internal core PA aligned with filament directions • Stars are correlated with filaments; ages ~ Myr velocity dispersions should ...
... • Turbulence not internally-driven since structure is dominated by large-scale filaments - swept up [but see movie -- gravity can produce filaments too] • Filaments have internal core PA aligned with filament directions • Stars are correlated with filaments; ages ~ Myr velocity dispersions should ...
Advanced Interactive PPT
... planets. Asteroids are material left over from the formation of the solar system. Asteroids are rocky and metallic objects that orbit the Sun but are too small to be considered planets. They are known as minor planets. Some have orbits that cross Earth’s path and some have even hit the Earth. ...
... planets. Asteroids are material left over from the formation of the solar system. Asteroids are rocky and metallic objects that orbit the Sun but are too small to be considered planets. They are known as minor planets. Some have orbits that cross Earth’s path and some have even hit the Earth. ...
L11
... The evolution of massive stars have the following general characteristics and differences to lower mass evolution 1. The electrons in their cores do not become degenerate until the final burning stages, when iron core is reached 2. Mass-loss plays an important role in the entire evolution (we will c ...
... The evolution of massive stars have the following general characteristics and differences to lower mass evolution 1. The electrons in their cores do not become degenerate until the final burning stages, when iron core is reached 2. Mass-loss plays an important role in the entire evolution (we will c ...
The mass function of star clusters formed in turbulent molecular clouds
... Assume a star formation efficiency (SFE) depending on the local density (cf. Krumholz 2012) ...
... Assume a star formation efficiency (SFE) depending on the local density (cf. Krumholz 2012) ...
Does size matter (in the SFRs)?
... the same locations of the graph, and have very similar values of the SFRs. On the contrary of course, UGC 5296 is not the only quiescent galaxy in the Universe, but the caveat is that 2/3 of the 18 galaxies we have observed common among the are quiescent. As they were selected because of their small ...
... the same locations of the graph, and have very similar values of the SFRs. On the contrary of course, UGC 5296 is not the only quiescent galaxy in the Universe, but the caveat is that 2/3 of the 18 galaxies we have observed common among the are quiescent. As they were selected because of their small ...
imaging science in astronomy - RIT CIS
... the appearance of transient phenomena such as comets and novae. During the latter half of the twentieth century, however, a revolution in astronomical imaging took place (1). This relatively brief period in recorded history saw the development and rapid refinement of techniques for collecting and de ...
... the appearance of transient phenomena such as comets and novae. During the latter half of the twentieth century, however, a revolution in astronomical imaging took place (1). This relatively brief period in recorded history saw the development and rapid refinement of techniques for collecting and de ...
The Milky Way and other Galaxies
... Mpc = megaparsec = 1 million parsecs Gpc = gigaparsec = 1 billion parsecs Distances of Mpc or even Gpc The light we see has left the galaxy millions or billions of years ago!! “Look-back times” of millions or billions of years ...
... Mpc = megaparsec = 1 million parsecs Gpc = gigaparsec = 1 billion parsecs Distances of Mpc or even Gpc The light we see has left the galaxy millions or billions of years ago!! “Look-back times” of millions or billions of years ...
General Astrophysics And Comparative Planetology
... The size of a planet is key to many of its properties, including its albedo and thermal emission. A measured radius is especially important for classifying new kinds of planets such as super Earths, ocean planets, and planets around non-solar type stars (e.g., Kuchner 2003). Figure 2 shows the masse ...
... The size of a planet is key to many of its properties, including its albedo and thermal emission. A measured radius is especially important for classifying new kinds of planets such as super Earths, ocean planets, and planets around non-solar type stars (e.g., Kuchner 2003). Figure 2 shows the masse ...
ppt
... planets have slightly different properties than nontransiting planets. • Most likely explanation: Transit searches are not as biased as radial velocity searches. One looks for transits around all stars in a field, these are not preselected. The only bias comes with which ones are followed up with Do ...
... planets have slightly different properties than nontransiting planets. • Most likely explanation: Transit searches are not as biased as radial velocity searches. One looks for transits around all stars in a field, these are not preselected. The only bias comes with which ones are followed up with Do ...
here - Atomki
... The Virial theorem can be obtain by multiplying the hydrostatic equil. Eqn. (2) by the volume (V=4/3 πr3) and integrate over the total mass, M: ∫V dP/dm = - 1/3 ∫(Gm/r) dm = 1/3 Egrav The left hand-side term is related to the internal energy, E int. After some algebra, one obtains for an ideal mono- ...
... The Virial theorem can be obtain by multiplying the hydrostatic equil. Eqn. (2) by the volume (V=4/3 πr3) and integrate over the total mass, M: ∫V dP/dm = - 1/3 ∫(Gm/r) dm = 1/3 Egrav The left hand-side term is related to the internal energy, E int. After some algebra, one obtains for an ideal mono- ...
Oct - Seattle Astronomical Society
... Earth at a mere 95.778 AU, on October 14, and will certainly be observed by several of the largest telescopes. I was able to participate in a teleconference with Brown, and I asked him about the status of TNO observations. He said that a number of findings have been made recently and that the only l ...
... Earth at a mere 95.778 AU, on October 14, and will certainly be observed by several of the largest telescopes. I was able to participate in a teleconference with Brown, and I asked him about the status of TNO observations. He said that a number of findings have been made recently and that the only l ...
Li-cai Deng
... of the sky. However, there is a great need for spectroscopic surveys of millions of stars. Twenty years ago, when the idea for the SDSS was born, large scale structures of galaxies had just been discovered. But there was structure on all scales of the largest surveys of the day. There was a pressing ...
... of the sky. However, there is a great need for spectroscopic surveys of millions of stars. Twenty years ago, when the idea for the SDSS was born, large scale structures of galaxies had just been discovered. But there was structure on all scales of the largest surveys of the day. There was a pressing ...
Extrasolar Planetary Systems » American Scientist
... a planet circling 51 Pegasi, a nearby star not all that different from the Sun. The planet, they claimed, is roughly 150 times more massive than Earth and travels in an orbit that takes only 4.2 days to complete. When the announcement was made at a scientific conference in Italy, the general reactio ...
... a planet circling 51 Pegasi, a nearby star not all that different from the Sun. The planet, they claimed, is roughly 150 times more massive than Earth and travels in an orbit that takes only 4.2 days to complete. When the announcement was made at a scientific conference in Italy, the general reactio ...
May / June 2009 - Astroadventures.net
... Telescopes of the Future - continued from page 2 I suspect the initialization and location without operator input will catch on, especially in telescopes within the price range of beginners. Over the years, a number of beginners have contacted me regarding computerized telescopes they could not get ...
... Telescopes of the Future - continued from page 2 I suspect the initialization and location without operator input will catch on, especially in telescopes within the price range of beginners. Over the years, a number of beginners have contacted me regarding computerized telescopes they could not get ...
Measuring Radii and Temperatures of Stars
... (work in cgs or MKS units or work in AU and use the definition of a parsec) What would the angular diameter of the Sun be at 10 pc? ...
... (work in cgs or MKS units or work in AU and use the definition of a parsec) What would the angular diameter of the Sun be at 10 pc? ...
The Milky Way Galaxy
... 2) the orbital distances of gas clouds and stars 3) the low density of stars in spiral arms ...
... 2) the orbital distances of gas clouds and stars 3) the low density of stars in spiral arms ...
observing cards - NC Science Festival
... Stars in open clusters are bright, young, and often blue - the teenage sisters of stars. They’ve blown off the rest of their parental gas and dust and hang together. Eventually the stars drift apart, but for now, they travel in a pack through ...
... Stars in open clusters are bright, young, and often blue - the teenage sisters of stars. They’ve blown off the rest of their parental gas and dust and hang together. Eventually the stars drift apart, but for now, they travel in a pack through ...
File - Hartnell College Astronomy Mr. Philip
... Read and follow the project descriptions carefully. Projects are due at the beginning of class two weeks before the final exam. The project is worth 10% of the final grade. Students who complete two projects will receive extra credit for their efforts. (1) Telescope Observations Attend a public star ...
... Read and follow the project descriptions carefully. Projects are due at the beginning of class two weeks before the final exam. The project is worth 10% of the final grade. Students who complete two projects will receive extra credit for their efforts. (1) Telescope Observations Attend a public star ...
Chapter 8: The Pennsylvanian Period in Alabama: Looking Up
... past. Both also involve processes that occur over time-spans much longer than a human lifetime. Walking the rock piles of the Minkin Paleozoic Footprint site, and seeing fossils of animals or plants that lived hundreds of millions of years ago, is like looking at a galaxy hundreds of millions of lig ...
... past. Both also involve processes that occur over time-spans much longer than a human lifetime. Walking the rock piles of the Minkin Paleozoic Footprint site, and seeing fossils of animals or plants that lived hundreds of millions of years ago, is like looking at a galaxy hundreds of millions of lig ...
Siriusposter
... white dwarfs. At these energies, white dwarfs are far brighter than most normal stars, and with ROSAT’s help we have been able to identify over 20 of these degenerate objects in binaries with bright, normal companions, just like the Sirius system. At optical wavelengths the white dwarfs are unresolv ...
... white dwarfs. At these energies, white dwarfs are far brighter than most normal stars, and with ROSAT’s help we have been able to identify over 20 of these degenerate objects in binaries with bright, normal companions, just like the Sirius system. At optical wavelengths the white dwarfs are unresolv ...
The Pennsylvanian Period in Alabama: Looking Up Astronomy and
... one must observe it with telescopes sensitive to longer wavelengths of light. The Galactic center is important because all objects in the disk of the Milky Way rotate around that point. If the Milky Way could be seen from the outside, it might resemble the galaxy shown in Fig. 8.2, bottom., known as ...
... one must observe it with telescopes sensitive to longer wavelengths of light. The Galactic center is important because all objects in the disk of the Milky Way rotate around that point. If the Milky Way could be seen from the outside, it might resemble the galaxy shown in Fig. 8.2, bottom., known as ...
Space Interferometry Mission
The Space Interferometry Mission, or SIM, also known as SIM Lite (formerly known as SIM PlanetQuest), was a planned space telescope developed by the U.S. National Aeronautics and Space Administration (NASA), in conjunction with contractor Northrop Grumman. One of the main goals of the mission was the hunt for Earth-sized planets orbiting in the habitable zones of nearby stars other than the Sun. SIM was postponed several times and finally cancelled in 2010.In addition to hunting for extrasolar planets, SIM would have helped astronomers construct a map of the Milky Way galaxy. Other important tasks would have included collecting data to help pinpoint stellar masses for specific types of stars, assisting in the determination of the spatial distribution of dark matter in the Milky Way and in the Local Group of galaxies and using the gravitational microlensing effect to measure the mass of stars.The spacecraft would have used optical interferometry to accomplish these and other scientific goals. This technique collects light with multiple mirrors (in SIM's case, two) which is combined to make an interference pattern which can be very precisely measured.The initial contracts for SIM Lite were awarded in 1998, totaling US$200 million. Work on the SIM project required scientists and engineers to move through eight specific new technology milestones, and by November 2006, all eight had been completed.SIM Lite was originally scheduled for a 2005 launch, aboard an Evolved Expendable Launch Vehicle (EELV). As a result of continued budget cuts, the launch date has been pushed back at least five times. NASA has set a preliminary launch date for 2015 and U.S. federal budget documents confirm that a launch date is expected ""no earlier"" than 2015. The budget cuts to SIM Lite are expected to continue through FY 2010. As of February 2007, many of the engineers working on the SIM program had moved on to other areas and projects, and NASA directed the project to allocate its resources toward engineering risk reduction. However, the preliminary budget for NASA for 2008 included zero dollars for SIM.In December 2007, the Congress restored funding for fiscal year 2008 as part of an omnibus appropriations bill which the President later signed. At the same time the Congress directed NASA to move the mission forward to the development phase. In 2009 the project continued its risk reduction work while waiting for the findings and recommendations of the Astronomy and Astrophysics Decadal Survey, Astro2010, performed by the National Academy of Sciences, which would determine the project's future.On 13 August 2010, the Astro2010 Decadal Report was released and did not recommend that NASA continue the development of the SIM Lite Astrometric Observatory. This prompted NASA Astronomy and Physics Director, Jon Morse, to issue a letter on 24 September 2010 to the SIM Lite project manager, informing him that NASA was discontinuing its sponsorship of the SIM Lite mission and directing the project to discontinue Phase B activities immediately or as soon as practical. Accordingly, all SIM Lite activities were closed down by the end of calendar year 2010.