The Cosmic Microwave Background Radiation Temperature
... detached from the re ector suggest the stray contribution from building walls may be a few degrees K, depending on pointing direction. (By itself, the feed acts as an antenna with a much broader beam, but with minimal sidelobes.) Signi cant contamination from the Sun and the inner Milky Way, near ea ...
... detached from the re ector suggest the stray contribution from building walls may be a few degrees K, depending on pointing direction. (By itself, the feed acts as an antenna with a much broader beam, but with minimal sidelobes.) Signi cant contamination from the Sun and the inner Milky Way, near ea ...
Astro 10: Introductory Astronomy
... • Perhaps two stars orbiting the galaxy pass, by chance, so close together that tidal forces pull off the outer layers and add angular momentum and that provides the proto-planetary disk? • Back decades ago, this older idea could not yet be ruled out • It was never favored, but now it can be conclus ...
... • Perhaps two stars orbiting the galaxy pass, by chance, so close together that tidal forces pull off the outer layers and add angular momentum and that provides the proto-planetary disk? • Back decades ago, this older idea could not yet be ruled out • It was never favored, but now it can be conclus ...
PHYSICS 1500 - ASTRONOMY TOTAL: 100 marks Section A Please
... mass star, how would you describe the more massive star? (a) Lower luminosity and older (b) Higher luminosity and shorter lifetime (c) Higher luminosity and longer lifetime (d) Lower luminosity and longer lifetime (e) Higher luminosity and younger ...
... mass star, how would you describe the more massive star? (a) Lower luminosity and older (b) Higher luminosity and shorter lifetime (c) Higher luminosity and longer lifetime (d) Lower luminosity and longer lifetime (e) Higher luminosity and younger ...
The infrared void in the Lupus dark clouds revisited: a
... 44 nights from 2001 to 2005 at Observatório do Pico dos Dias (LNA/MCT, Brazil). 131 Hipparcos stars with trigonometric parallaxes H ≥ 4mas (≤ 250 pc). Selection criterion: /H ≤ 1/3 Calibration targets: polarized and unpolarized standart stars (
... 44 nights from 2001 to 2005 at Observatório do Pico dos Dias (LNA/MCT, Brazil). 131 Hipparcos stars with trigonometric parallaxes H ≥ 4mas (≤ 250 pc). Selection criterion: /H ≤ 1/3 Calibration targets: polarized and unpolarized standart stars (
~ -0.007 and ~ -0.006 per cent smal ...
Stellar Evolution – Test Review Answers
... An absorption line spectrum is a series of dark spectral lines among the colors of the continuous spectrum. The dark lines in the absorption spectrum of a particular gas occur at exactly the same wavelengths as the bright lines in the emission spectrum of that same gas. 7. Why do astronomers see an ...
... An absorption line spectrum is a series of dark spectral lines among the colors of the continuous spectrum. The dark lines in the absorption spectrum of a particular gas occur at exactly the same wavelengths as the bright lines in the emission spectrum of that same gas. 7. Why do astronomers see an ...
The Revolution in Telescope Aperture
... D/t of the primary mirrors to reduce the mass of the mirror, the supporting telescope and the surrounding structure. The availability of analytical models opened the way to understanding the detailed performance of these lighter mirrors and telescope structures and the active systems needed to suppo ...
... D/t of the primary mirrors to reduce the mass of the mirror, the supporting telescope and the surrounding structure. The availability of analytical models opened the way to understanding the detailed performance of these lighter mirrors and telescope structures and the active systems needed to suppo ...
Star Formation
... • The protostar keeps contracting under it own gravity. The protostar is powered by gravity via contraction - not by fusion. • The protostar becomes a star when it has contracted so much that it is dense and hot enough to begin ...
... • The protostar keeps contracting under it own gravity. The protostar is powered by gravity via contraction - not by fusion. • The protostar becomes a star when it has contracted so much that it is dense and hot enough to begin ...
Galaxy Far Far Away ppt
... of the galaxy. NUCLEAR BULGE: Flattened cloud about 3 pc in radius around center of the galaxy. HALO: Area surrounding galaxy that contains some scattered globular clusters. DISK: Contains most of the stars in the galaxy. ...
... of the galaxy. NUCLEAR BULGE: Flattened cloud about 3 pc in radius around center of the galaxy. HALO: Area surrounding galaxy that contains some scattered globular clusters. DISK: Contains most of the stars in the galaxy. ...
Formation of Stars
... • Space between the stars within a galaxy is not empty. • The interstellar medium (ISM) consists of gas and dust. • Gas is mainly hydrogen, but also contains other elements and molecules. • Density is typically around 1 atom per cubic centimeter. ...
... • Space between the stars within a galaxy is not empty. • The interstellar medium (ISM) consists of gas and dust. • Gas is mainly hydrogen, but also contains other elements and molecules. • Density is typically around 1 atom per cubic centimeter. ...
Biology Revision Pack
... Artificial satellites are built by people and launched by rockets into space, where they orbit around the Earth. These are some of the things that artificial satellites are used for: communications, including broadcasting television programmes and relaying telephone calls Global Positioning System ( ...
... Artificial satellites are built by people and launched by rockets into space, where they orbit around the Earth. These are some of the things that artificial satellites are used for: communications, including broadcasting television programmes and relaying telephone calls Global Positioning System ( ...
Candles in the Dark
... that the Milky Way was the whole Universe, so M31 was presumably a relatively small and nearby object. Hubble calculated from the variation of his Andromeda Cepheid how far away it was and came up with the answer of more than 900 000 light years (better modern measurements give the accepted figure o ...
... that the Milky Way was the whole Universe, so M31 was presumably a relatively small and nearby object. Hubble calculated from the variation of his Andromeda Cepheid how far away it was and came up with the answer of more than 900 000 light years (better modern measurements give the accepted figure o ...
Mass determinations of PMS stars with the
... • We already had observations of BS Indi (K=6.6 mag) with AMBER but the signal resulted to be too faint (+ no standard observed) • In this period our brightest (HD113449) candidate will be observed with AMBER • We hope to observe all targets with the VLTI (UTs or ATs + fringe tracker) to put constra ...
... • We already had observations of BS Indi (K=6.6 mag) with AMBER but the signal resulted to be too faint (+ no standard observed) • In this period our brightest (HD113449) candidate will be observed with AMBER • We hope to observe all targets with the VLTI (UTs or ATs + fringe tracker) to put constra ...
S3.3 Study of Physical Characteristics of High Apogee Space Debris
... Key words: Space Debris; High Apogee; Optical Characteristics 1. INTRODUCTION MHASD (orbital altitude higher than 20,000km) are too distant for radar tracking and high resolution optical imaging [1]. Non-imaging optical observation is most suitable for determining their physical characteristics, suc ...
... Key words: Space Debris; High Apogee; Optical Characteristics 1. INTRODUCTION MHASD (orbital altitude higher than 20,000km) are too distant for radar tracking and high resolution optical imaging [1]. Non-imaging optical observation is most suitable for determining their physical characteristics, suc ...
Lenses - singhscience
... creates a real image within a telescope of a distant object. Eyepiece lens – magnifies the image of a distant object. ...
... creates a real image within a telescope of a distant object. Eyepiece lens – magnifies the image of a distant object. ...
Silvia Leurini (MPIfR), Friedrich Wyrowski (MPIfR), Fabrice Herpin
... One of the most prominent regions of massive star formation in the southern celestial hemisphere is the HII region G327.3–0.6 at a kinematical distance of 2.9 kpc (Bergman 1992). Associated with this region is a prominent hot core (500 M⊙ and 105 L⊙), characterized by H2O, OH, and CH3OH masers, and ...
... One of the most prominent regions of massive star formation in the southern celestial hemisphere is the HII region G327.3–0.6 at a kinematical distance of 2.9 kpc (Bergman 1992). Associated with this region is a prominent hot core (500 M⊙ and 105 L⊙), characterized by H2O, OH, and CH3OH masers, and ...
Past, Present and Future of Chinese Astronomy
... shown an excess above 100 GeV compared to theoretical models. The excess of cosmic ray electrons is mysterious. It could be from near astrophysical objects or other exotic sources such as dark matter particles. Jin Chang and his group played an important role for these observations (Chang et al. 200 ...
... shown an excess above 100 GeV compared to theoretical models. The excess of cosmic ray electrons is mysterious. It could be from near astrophysical objects or other exotic sources such as dark matter particles. Jin Chang and his group played an important role for these observations (Chang et al. 200 ...
Branches of Astronomy
... Full moon - The phase of the moon when the side facing the earth is completely lit by sunlight. Geology - the study of the Earth. Giant planets - Jupiter, Saturn, Uranus, and Neptune. Gibbous moon - the phases between half moon and full moon. Great Red Spot - Thel large red storm going around like a ...
... Full moon - The phase of the moon when the side facing the earth is completely lit by sunlight. Geology - the study of the Earth. Giant planets - Jupiter, Saturn, Uranus, and Neptune. Gibbous moon - the phases between half moon and full moon. Great Red Spot - Thel large red storm going around like a ...
22 pm - Starmap
... As a starting point, face North, holding the map in your eyesight direction, with its North down. As you change the direction, rotate the map accordingly. The objects listed on the first page can be observed with naked eyes, in clear skies, with moderate light pollution. Close your eyes one minute a ...
... As a starting point, face North, holding the map in your eyesight direction, with its North down. As you change the direction, rotate the map accordingly. The objects listed on the first page can be observed with naked eyes, in clear skies, with moderate light pollution. Close your eyes one minute a ...
Study Guide #3 Answer Key
... newly confirmed to be a supermassive black hole. For a photo see Chandra X-ray Observatory; Jan. 6, 2003 Most galaxies are believed to have a supermassive black hole at their center.[24] The Galaxy's bar is thought to be about 27,000 light-years long, running through its center at a 44 ± 10 degree a ...
... newly confirmed to be a supermassive black hole. For a photo see Chandra X-ray Observatory; Jan. 6, 2003 Most galaxies are believed to have a supermassive black hole at their center.[24] The Galaxy's bar is thought to be about 27,000 light-years long, running through its center at a 44 ± 10 degree a ...
Milky Way thin disk
... Q: in order to study the spatial distribution of the thin disk (which dominates the Milky Way luminosity) surface photometry in the K band from space has been used. What is the advantage of the K band? What sort of stars give off most of their light at 2 ...
... Q: in order to study the spatial distribution of the thin disk (which dominates the Milky Way luminosity) surface photometry in the K band from space has been used. What is the advantage of the K band? What sort of stars give off most of their light at 2 ...
Test 2
... 8) At sunset, you look toward the south and high in the sky. You see the moon. What phase is the moon in? a) new b) first quarter c) full d) last quarter 9) At sunset, you look toward the east. The moon is right on the horizon. What phase is the moon in? a) new b) first quarter c) full d) last quar ...
... 8) At sunset, you look toward the south and high in the sky. You see the moon. What phase is the moon in? a) new b) first quarter c) full d) last quarter 9) At sunset, you look toward the east. The moon is right on the horizon. What phase is the moon in? a) new b) first quarter c) full d) last quar ...
Chapter 1 Section Misconception Truth Distances in the Universe
... Mini Black Holes Particles can escape from black holes. In Hawking radiation, we have the situation that energy that spontaneously appears outside a black hole (which it can do for a limited time within Heisenberg's uncertainty principle) converts into a particle/antiparticle pair. If one ...
... Mini Black Holes Particles can escape from black holes. In Hawking radiation, we have the situation that energy that spontaneously appears outside a black hole (which it can do for a limited time within Heisenberg's uncertainty principle) converts into a particle/antiparticle pair. If one ...
Spitzer Space Telescope
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.