![Interpretation of the Helix Planetary Nebula using Hydro](http://s1.studyres.com/store/data/014975183_1-7c47c93dc675a5b5dc15f84fee17a0a3-300x300.png)
Interpretation of the Helix Planetary Nebula using Hydro
... According to HGD, SNe Ia explosions always occur in PNes within massive dense (protoglobular-star-cluster; ie, PGC) clumps of frozen primordial planets (primordial-fog-particles or PFPs) that form larger planets and finally stars as binaries. Planetary nebulae are not just brief puffs of illuminated ...
... According to HGD, SNe Ia explosions always occur in PNes within massive dense (protoglobular-star-cluster; ie, PGC) clumps of frozen primordial planets (primordial-fog-particles or PFPs) that form larger planets and finally stars as binaries. Planetary nebulae are not just brief puffs of illuminated ...
The Evolution of Galaxy - Tufts Institute of Cosmology
... astronomers felt they at least understood the basic properties of clusters: They consisted of speeding galaxies bound together by huge amounts of dark matter. They were stable and immutable objects. Then came 1970. In that year a new satellite, named Uhuru (“freedom” in Swahili) in honor of its laun ...
... astronomers felt they at least understood the basic properties of clusters: They consisted of speeding galaxies bound together by huge amounts of dark matter. They were stable and immutable objects. Then came 1970. In that year a new satellite, named Uhuru (“freedom” in Swahili) in honor of its laun ...
The GMT Consortium Large Earth Finder Sagi Ben-Ami Smithsonian Astrophysical Observatory
... Smithsonian Astrophysical Observatory ...
... Smithsonian Astrophysical Observatory ...
Finding KBO Flyby Targets for New Horizons
... objects with a good launch (i.e., higher available KBO Δv), corresponding to diameters of 29 – 64 km, depending on albedo. Figure 2 shows the radial distribution of encounter probabilities, which has a strong peak near 42 AU. We also considered the benefits of adjusting the Pluto encounter time to i ...
... objects with a good launch (i.e., higher available KBO Δv), corresponding to diameters of 29 – 64 km, depending on albedo. Figure 2 shows the radial distribution of encounter probabilities, which has a strong peak near 42 AU. We also considered the benefits of adjusting the Pluto encounter time to i ...
Is there a Supermassive Black Hole at the Center of the Milky Way?
... Continued monitoring of the positions of stars, with increasing positional accuracy, led to clear detections of acceleration (ie, curving motions on the sky)35,36 . Importantly, the directions of the acceleration vectors “pointed” to a common central gravitational source very close to the position o ...
... Continued monitoring of the positions of stars, with increasing positional accuracy, led to clear detections of acceleration (ie, curving motions on the sky)35,36 . Importantly, the directions of the acceleration vectors “pointed” to a common central gravitational source very close to the position o ...
Starting Out in Astronomy Observing the Moon Darkness Over Africa
... astronomical society, while those with a mild interest may venture out again, perhaps to a Star Party. What happens? They arrive in suits and dresses - the most inappropriate clothing - freeze, and then decide that astronomy is not for them. It cannot be emphasised enough that one must be adequately ...
... astronomical society, while those with a mild interest may venture out again, perhaps to a Star Party. What happens? They arrive in suits and dresses - the most inappropriate clothing - freeze, and then decide that astronomy is not for them. It cannot be emphasised enough that one must be adequately ...
Document
... break technique in combination with the new generation of 8- to 10-m telescopes made it possible to identify significant samples of high-redshift objects. Lyman Break Galaxies (LBGs) are color-selected, luminous, star forming galaxies that emitted their light more than 10 billion years ago, e.g., at ...
... break technique in combination with the new generation of 8- to 10-m telescopes made it possible to identify significant samples of high-redshift objects. Lyman Break Galaxies (LBGs) are color-selected, luminous, star forming galaxies that emitted their light more than 10 billion years ago, e.g., at ...
LET THE STARS GET IN YOUR EYES SKY MOTIONS
... constellations requires a constellation chart, a red flashlight and your willingness to explore the sky. A red flashlight is a basic tool of astronomers because it won't ruin your night vision. You can paint your light red, or cover your light with a red filter. Red flashlights can also be purchased ...
... constellations requires a constellation chart, a red flashlight and your willingness to explore the sky. A red flashlight is a basic tool of astronomers because it won't ruin your night vision. You can paint your light red, or cover your light with a red filter. Red flashlights can also be purchased ...
Success, Truth, and the Galilean Strategy
... distribute telescopes that would generate an increasingly more consistent set of astronomical observations, Galileo was able to convince his peers that there was no more basis for thinking that the instrument was unreliable in the heavens than for believing it inept in some as yet untried part of th ...
... distribute telescopes that would generate an increasingly more consistent set of astronomical observations, Galileo was able to convince his peers that there was no more basis for thinking that the instrument was unreliable in the heavens than for believing it inept in some as yet untried part of th ...
PLANETS
... among the debris and between it and other members of the system, eventually grinding a significant amount of material into dust grains distributed in a so-called debris disk. Because the grains have larger surface area per unit mass compared to larger bodies, they (re)radiate more energy and therefo ...
... among the debris and between it and other members of the system, eventually grinding a significant amount of material into dust grains distributed in a so-called debris disk. Because the grains have larger surface area per unit mass compared to larger bodies, they (re)radiate more energy and therefo ...
MEarth
... With the Spitzer Space Telescope and the James Webb Space Telescope (JWST), atmospheric observations similar to those mentioned earlier for Hot Jupiters can be extended to habitable Earth-sized planets orbiting M dwarfs. This possibility is brought about by the small surface areas and temperatures o ...
... With the Spitzer Space Telescope and the James Webb Space Telescope (JWST), atmospheric observations similar to those mentioned earlier for Hot Jupiters can be extended to habitable Earth-sized planets orbiting M dwarfs. This possibility is brought about by the small surface areas and temperatures o ...
chapter9-Section2
... In the simplest designs, a large bowl of mercury is spun at the proper rate to produce a surface with the desired parabolic shape. ...
... In the simplest designs, a large bowl of mercury is spun at the proper rate to produce a surface with the desired parabolic shape. ...
Galaxies
... appear aligned along walls and filaments. Vast regions of space are completely empty: “Voids” ...
... appear aligned along walls and filaments. Vast regions of space are completely empty: “Voids” ...
It is now recognized that the vast majority of ellipticals are of
... • 25% to more than 40% of E galaxies show features due to dust absorption. • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amount ...
... • 25% to more than 40% of E galaxies show features due to dust absorption. • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amount ...
Ovid: Jet-like features near the nucleus of Chiron.
... Planetary Laboratory, University of Arizona, Tucson, Arizona 85709, USA (R. Marcialis); Pima Community College, 2202 West Anklam Road, Tucson, Arizona 85709, USA (R. Marcialis); Ball Aerospace, PO Box 1062, Boulder, Colorado 80306-1062, USA (H. Reitsema); Universite Paris 6, UFR physique 924, 75252 ...
... Planetary Laboratory, University of Arizona, Tucson, Arizona 85709, USA (R. Marcialis); Pima Community College, 2202 West Anklam Road, Tucson, Arizona 85709, USA (R. Marcialis); Ball Aerospace, PO Box 1062, Boulder, Colorado 80306-1062, USA (H. Reitsema); Universite Paris 6, UFR physique 924, 75252 ...
A New Science Strategy for Space Astronomy and Astrophysics
... NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee ...
... NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee ...
Update to IRS Shortlo Frame Table
... systematics, we unfortunately always started from the same end of the slit. If the telescope was scanning faster (or moving farther) in one direction than the other due to a scale factor error, the difference between the requested and true position of the telescope would be a function of scan distan ...
... systematics, we unfortunately always started from the same end of the slit. If the telescope was scanning faster (or moving farther) in one direction than the other due to a scale factor error, the difference between the requested and true position of the telescope would be a function of scan distan ...
Dust and molecular gas in the most distant quasars
... • Resolve the stellar bulge at near-IR wavelengths. – Not yet; • Require gas supply from outside; • Rapid supper-massive black hole accretion occurs prior to the formation of the stellar bulge. ...
... • Resolve the stellar bulge at near-IR wavelengths. – Not yet; • Require gas supply from outside; • Rapid supper-massive black hole accretion occurs prior to the formation of the stellar bulge. ...
151 - ESO
... During one of these pulsations the size of the star also changes. The radius of the star can alter with 10-20%. Harvard astronomer Miss Henrietta Leavitt was the first person to determine distances using Cepheids. Therefor in 1912 she made it possible to prove that “spiral-nebulas” (?) are independe ...
... During one of these pulsations the size of the star also changes. The radius of the star can alter with 10-20%. Harvard astronomer Miss Henrietta Leavitt was the first person to determine distances using Cepheids. Therefor in 1912 she made it possible to prove that “spiral-nebulas” (?) are independe ...
The Hipparcos Star Globe Booklet - Cosmos
... evolution of the Galaxy as never before. Gaia’s improved sensitivity will also enable the detection of numerous extra-galactic objects, asteroids and extrasolar planets, and provide a number of stringent new tests for general relativity and cosmology. Due for launch in 2011, Gaia will use advanced t ...
... evolution of the Galaxy as never before. Gaia’s improved sensitivity will also enable the detection of numerous extra-galactic objects, asteroids and extrasolar planets, and provide a number of stringent new tests for general relativity and cosmology. Due for launch in 2011, Gaia will use advanced t ...
IRAM Annual Report 2014
... asymmetrically distributed in the disk. The authors argue that this is further evidence to support the view that B-type stars may form through diskmediated accretion as their low-mass siblings do, and suggest that the disk structure may be significantly perturbed by tidal interactions with companion ...
... asymmetrically distributed in the disk. The authors argue that this is further evidence to support the view that B-type stars may form through diskmediated accretion as their low-mass siblings do, and suggest that the disk structure may be significantly perturbed by tidal interactions with companion ...
Spitzer Space Telescope
![](https://commons.wikimedia.org/wiki/Special:FilePath/Spitzer_space_telescope.jpg?width=300)
The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space observatory launched in 2003. It is the fourth and final of the NASA Great Observatories program.The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments are no longer usable. However, the two shortest-wavelength modules of the IRAC camera are still operable with the same sensitivity as before the cryogen was exhausted, and will continue to be used in the Spitzer Warm Mission. All Spitzer data, from both the primary and warm phases, are archived at the Infrared Science Archive (IRSA).In keeping with NASA tradition, the telescope was renamed after its successful demonstration of operation, on 18 December 2003. Unlike most telescopes that are named after famous deceased astronomers by a board of scientists, the new name for SIRTF was obtained from a contest open to the general public.The contest led to the telescope being named in honor of astronomer Lyman Spitzer, who had promoted the concept of space telescopes in the 1940s. Spitzer wrote a 1946 report for RAND Corporation describing the advantages of an extraterrestrial observatory and how it could be realized with available or upcoming technology. He has been cited for his pioneering contributions to rocketry and astronomy, as well as ""his vision and leadership in articulating the advantages and benefits to be realized from the Space Telescope Program.""The US$800 million Spitzer was launched from Cape Canaveral Air Force Station, on a Delta II 7920H ELV rocket, Monday, 25 August 2003 at 13:35:39 UTC-5 (EDT).It follows a heliocentric instead of geocentric orbit, trailing and drifting away from Earth's orbit at approximately 0.1 astronomical unit per year (a so-called ""earth-trailing"" orbit). The primary mirror is 85 centimeters (33 in) in diameter, f/12, made of beryllium and is cooled to 5.5 K (−449.77 °F). The satellite contains three instruments that allow it to perform astronomical imaging and photometry from 3 to 180 micrometers, spectroscopy from 5 to 40 micrometers, and spectrophotometry from 5 to 100 micrometers.