What color are stars?
... Stars are found in a wide range of colors, from red through violet as well as white. ...
... Stars are found in a wide range of colors, from red through violet as well as white. ...
Photometric Analysis of the Pi of the Sky Data
... Pi of the Sky [4] is a robotic telescope aimed at monitoring a large part of the sky with a good range and time resolution. The detector was designed for observations of astrophysical phenomena characterized by short timescales, especially for prompt optical counterparts of Gamma Ray Bursts (GRBs). ...
... Pi of the Sky [4] is a robotic telescope aimed at monitoring a large part of the sky with a good range and time resolution. The detector was designed for observations of astrophysical phenomena characterized by short timescales, especially for prompt optical counterparts of Gamma Ray Bursts (GRBs). ...
Space astrometry 2: Scientific results from Hipparcos
... Solar motion with respect to LSR (Dehnen & Binney 1988): u0 = +10.00, v0 = +5.25, w0 = +7.17 km/s Galactic rotation (Feast & Whitelock 1997): A=+14.82, B=−12.37 km/s/kpc Ω0 = (Θ/R)R0 = A−B = +27.19 km/s/kpc (dΘ/dR)R0 = −(A+B) = −2.45 km/s/kpc (slightly decreasing) Circular velocity at R0 = R0 Ω0 = 2 ...
... Solar motion with respect to LSR (Dehnen & Binney 1988): u0 = +10.00, v0 = +5.25, w0 = +7.17 km/s Galactic rotation (Feast & Whitelock 1997): A=+14.82, B=−12.37 km/s/kpc Ω0 = (Θ/R)R0 = A−B = +27.19 km/s/kpc (dΘ/dR)R0 = −(A+B) = −2.45 km/s/kpc (slightly decreasing) Circular velocity at R0 = R0 Ω0 = 2 ...
The Next Great Exoplanet Hunt Please share
... The practical value of transits and occultations depends critically on the brightness of the star. The higher the rate of photons (particles of light) that a star delivers to Earth, the faster we can accumulate information about its exoplanets. This is because many astronomical observations are limi ...
... The practical value of transits and occultations depends critically on the brightness of the star. The higher the rate of photons (particles of light) that a star delivers to Earth, the faster we can accumulate information about its exoplanets. This is because many astronomical observations are limi ...
Extreme Optics and the Search for Earth-Like Planets
... our Sun isn’t special, then probably planets aren’t special either. With this logic astronomers have long expected that there are planets around other stars. But, detecting them is a major technological challenge. However, in the early 1990’s there was the mounting realization that large, Jupiter-si ...
... our Sun isn’t special, then probably planets aren’t special either. With this logic astronomers have long expected that there are planets around other stars. But, detecting them is a major technological challenge. However, in the early 1990’s there was the mounting realization that large, Jupiter-si ...
Educator`s Guide to the Cullman Hall of the Universe, Heilbrunn
... thousands of times smaller to a hundred times larger than our own Milky Way Galaxy, which alone contains more than 100 billion stars. Like our Sun, many of these stars have planets, asteroids, meteoroids, and comets in orbit around them. However, all observable matter (most of which is hydrogen or h ...
... thousands of times smaller to a hundred times larger than our own Milky Way Galaxy, which alone contains more than 100 billion stars. Like our Sun, many of these stars have planets, asteroids, meteoroids, and comets in orbit around them. However, all observable matter (most of which is hydrogen or h ...
New Worlds on the Horizon: Earth-Sized Planets Close to Other
... conditions that could support life as we understand it? Close-in planets around lowluminosity M dwarfs can orbit within the habitable zone (Fig. 3). However, charged particles in flares from the nearby host star or impacts at the high velocities of these orbits may remove such planets’ atmospheres, ...
... conditions that could support life as we understand it? Close-in planets around lowluminosity M dwarfs can orbit within the habitable zone (Fig. 3). However, charged particles in flares from the nearby host star or impacts at the high velocities of these orbits may remove such planets’ atmospheres, ...
4P38.pdf
... the transition region and chromospheric FUV-UV emissions of the young Sun are expected to be 20-60 and 10-20 times stronger, respectively, than presently. In the entire XUV interval from 1 to 1200 Å, we find that the solar high-energy flux was about 3 times the present value 2.5 Gyr ago and about 6 ...
... the transition region and chromospheric FUV-UV emissions of the young Sun are expected to be 20-60 and 10-20 times stronger, respectively, than presently. In the entire XUV interval from 1 to 1200 Å, we find that the solar high-energy flux was about 3 times the present value 2.5 Gyr ago and about 6 ...
Galaxies - cloudfront.net
... _____ 6. The reason we can’t see many dwarf galaxies is that they are so distant. _____ 7. The Milky Way Galaxy has a disk and central bulge. _____ 8. Our solar system is at the outermost edge of our galaxy. _____ 9. Constellations are binary or multiple star systems. _____ 10. More than half of the ...
... _____ 6. The reason we can’t see many dwarf galaxies is that they are so distant. _____ 7. The Milky Way Galaxy has a disk and central bulge. _____ 8. Our solar system is at the outermost edge of our galaxy. _____ 9. Constellations are binary or multiple star systems. _____ 10. More than half of the ...
Chapter 15 Surveying the Stars
... Area of sphere: 4π (radius)2 Divide luminosity by area to get brightness ...
... Area of sphere: 4π (radius)2 Divide luminosity by area to get brightness ...
Ch. 25 - UTK Department of Physics and Astronomy
... The quasars we see are very distant, meaning they existed a long time ago. Therefore, they may represent an early stage in galaxy development. The quasars in this image are shown with their host galaxies; many appear to be involved in collisions. ...
... The quasars we see are very distant, meaning they existed a long time ago. Therefore, they may represent an early stage in galaxy development. The quasars in this image are shown with their host galaxies; many appear to be involved in collisions. ...
Searching for HI emission from distant galaxies
... Sensitivity Issues – need for SKA The flux from an MHI* galaxy at z ~ 1 is M HI 200km / s 6.2 103 Mpc 1 z S 7 Jy ( ...
... Sensitivity Issues – need for SKA The flux from an MHI* galaxy at z ~ 1 is M HI 200km / s 6.2 103 Mpc 1 z S 7 Jy ( ...
T Einstein’s Mirage Paul L. Schechter
... dark matter and the baryons. Galaxies are almost certainly regions with higher-thanappears bluish white.The close pair of bright average baryonic content (and lower-than-average dark matter content), but just images obeys the theorem that demands how much depends upon details of the galaxy formation ...
... dark matter and the baryons. Galaxies are almost certainly regions with higher-thanappears bluish white.The close pair of bright average baryonic content (and lower-than-average dark matter content), but just images obeys the theorem that demands how much depends upon details of the galaxy formation ...
Milky Way inner halo reveals its age | COSMOS magazine
... Cross said that the finding “adds more evidence that the inner halo is a distinct stellar population from the outer halo,” which is a fairly recent discovery. “Understanding exactly when the stars in these structures formed, combined with detailed measurements of the dynamics and chemical content, a ...
... Cross said that the finding “adds more evidence that the inner halo is a distinct stellar population from the outer halo,” which is a fairly recent discovery. “Understanding exactly when the stars in these structures formed, combined with detailed measurements of the dynamics and chemical content, a ...
Draft Science Cases for KPAO
... times (and the consequent pupil rotation) in the visible will allow averaging out a lot of the residual speckles and diffractive effects. As long as the MTF does not go to zero until the cut-off spatial frequency, information can be retrieved even with a limited knowledge of the PSF. One of the cons ...
... times (and the consequent pupil rotation) in the visible will allow averaging out a lot of the residual speckles and diffractive effects. As long as the MTF does not go to zero until the cut-off spatial frequency, information can be retrieved even with a limited knowledge of the PSF. One of the cons ...
Distance - Fixed Earth
... stationary with the sun orbiting it--as all observational evidence insists--then the base of that triangle is only 8,000 miles. That means that Besselian "math" puts the "nearby"stars 23,250 times too far out. Fact Six: Time is the hero of the evolution plot, both for the universe and for Earth. Wi ...
... stationary with the sun orbiting it--as all observational evidence insists--then the base of that triangle is only 8,000 miles. That means that Besselian "math" puts the "nearby"stars 23,250 times too far out. Fact Six: Time is the hero of the evolution plot, both for the universe and for Earth. Wi ...
Ground-Based Astrometry 2010-2020
... infrared JASMINE spacecraft (launch date not set) targets 108 stars in the Galactic bulge to z ∼ 14. The future of NASA’s SIM remains uncertain, but it could observe 104 stars with precisions at the µas level and would reach to magnitude 20. Even if all four are successful, it must be stressed that ...
... infrared JASMINE spacecraft (launch date not set) targets 108 stars in the Galactic bulge to z ∼ 14. The future of NASA’s SIM remains uncertain, but it could observe 104 stars with precisions at the µas level and would reach to magnitude 20. Even if all four are successful, it must be stressed that ...
ted_2012_power_of_design
... In 1969, as a captivated world watched, Neil Armstrong took the first steps on the moon, achieving what President John F. Kennedy called “the most hazardous and dangerous and greatest adventure on which man has ever embarked.” ...
... In 1969, as a captivated world watched, Neil Armstrong took the first steps on the moon, achieving what President John F. Kennedy called “the most hazardous and dangerous and greatest adventure on which man has ever embarked.” ...
Strategy For Verification and Validation
... 4. Is There Life Else-where? The NWO mission is designed to answer this question, and can fully address this issue. • Determine the frequency with which planets are found within the habitable zones of other stars and characterize their physical properties, such as mass, diameter and orbital paramete ...
... 4. Is There Life Else-where? The NWO mission is designed to answer this question, and can fully address this issue. • Determine the frequency with which planets are found within the habitable zones of other stars and characterize their physical properties, such as mass, diameter and orbital paramete ...
Chapter 7: The Galaxy, structure and content File
... appear for stars of all ages. (And these are clumps only in velocity space, not in real space.) The idea that there are groups of stars at similar velocities is itself not new—it actually dates from the early proper motion measurements of nearly a century ago. But these ‘streams’ have generally been ...
... appear for stars of all ages. (And these are clumps only in velocity space, not in real space.) The idea that there are groups of stars at similar velocities is itself not new—it actually dates from the early proper motion measurements of nearly a century ago. But these ‘streams’ have generally been ...
Peer-reviewed Article PDF - e
... these methods showed that the masses of accumulations determined from their brightness are much smaller than the masses determined using the dynamic method. It turned out that the difference was ...
... these methods showed that the masses of accumulations determined from their brightness are much smaller than the masses determined using the dynamic method. It turned out that the difference was ...
lab 11 only - Penn State University
... spherical cloud of stars that surrounds the entire galaxy). The halo is much larger than the bulge. Our Milky Way Galaxy is made up of mostly stars, gas, and dust. The dust blocks out light from distant stars, and makes it hard to see a lot of the galaxy, especially the bulge and parts of the disk. ...
... spherical cloud of stars that surrounds the entire galaxy). The halo is much larger than the bulge. Our Milky Way Galaxy is made up of mostly stars, gas, and dust. The dust blocks out light from distant stars, and makes it hard to see a lot of the galaxy, especially the bulge and parts of the disk. ...
latest Edition - ExoPlanet News
... Kepler-78b is one of a growing sample of planets similar, in composition and size, to the Earth. It was first detected with NASA’s Kepler spacecraft and then characterised in more detail using radial velocity follow-up observations. Not only is its size very similar to that of the Earth (1.2R⊕ ), it ...
... Kepler-78b is one of a growing sample of planets similar, in composition and size, to the Earth. It was first detected with NASA’s Kepler spacecraft and then characterised in more detail using radial velocity follow-up observations. Not only is its size very similar to that of the Earth (1.2R⊕ ), it ...
Chapter 15
... diameter depend on Sun’s distance to center • Red giant maser method – Red giant maser radio sources common in inner bulge – Stars near galactic center move in random directions – Assume in a given volume a star moving radially has the same speed as one moving across the line of sight – Use Doppler ...
... diameter depend on Sun’s distance to center • Red giant maser method – Red giant maser radio sources common in inner bulge – Stars near galactic center move in random directions – Assume in a given volume a star moving radially has the same speed as one moving across the line of sight – Use Doppler ...
Chapter 30 Notes
... • As gravity makes dense regions within a nebula more compact, these regions spin and shrink and begin to form a flattened disk. The disk has a central concentration of matter called a protostar. • The protostar continues to contract and increase in temperature for several million years. Eventually ...
... • As gravity makes dense regions within a nebula more compact, these regions spin and shrink and begin to form a flattened disk. The disk has a central concentration of matter called a protostar. • The protostar continues to contract and increase in temperature for several million years. Eventually ...
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.