Star Size Comparisons . ... Credit Copyright: morn1415 (YouTube) Explanation: How big is our Sun compared to other stars? In a dramatic and popular video featured on YouTube , the relative sizes of planets and stars are shown from smallest to largest. ... Although an inspiring learning tool that is mostly accurate, APOD readers are encouraged to complete the learning experience -- and possibly help make future versions more accurate -- by pointing out slight inaccuracies in the video. ...

A comparative study of type I and type II supernovae . ... Sternberg State Astronomical Institute, Moscow, U.S.S.R. (Received 26 November, 1985) . ... No significant difference between SNe I and SNe II has been found in their radial distribution and frequency of outbursts in spiral galaxies. ... The radial distribution of type Ia SNe in spiral galaxies is only slightly steeper than the one for SNe II, while SNe Ib/c are more concentrated towards the central regions. ...

... In order to compare the number of different evolutionary stages obtained and X-ray luminosity of the chosen X-ray sources with the observed galactic values we use the sum of C/O+O/C , where C and O are the calculated and observed values of a given binary type, respectively. If we make comparison for a number of different binary species (for example, we compare the number of CV, number of X-ray pulsars,   total X-ray luminosity of LMXB, etc.), we write this criterion in the form: . ...

... Up: VO Resources . ... Monkewitz, S. & Good, J. 2003, in ASP Conf. ... We describe the architecture of a general cross-comparison engine capable of spatially matching sources in one astronomical source catalog with those in another. ... Support is provided for common catalog formats and data sources (e.g. local disk, database servers), and the addition of support for custom data formats and sources is simplified by the modular architecture employed. ... Data Access: . ... Source List Processing: . ...

Crater Gassendi . ... I made this drawing was made on the 26th of november 2001. If you compare this one with the previous drawing of Gassendi (below) the differences are clear. ... This drawing was made on the 28th of september 2001. After nearly a full month without observations I had a one hour gap between the thicker clouds. ... This drawing was made on the 29th of august 2001. ... This drawing was made on the 27th of august 2001. ... This drawing was made on the 25th of august 2001. ...

... ME AND MY SCHOOL . SOURCES . THE CHART OF THE DIFFERENCES IN THE SPELLING OF SOME WORDS CONNECTED WITH SCHOOL AND EDUCATIONAL SYSTEM IN BRITAIN AMERICA. ... РАЗЛИЧНЫЕ СТРАНЫ ИМЕЮТ РАЗЛИЧНЫЕ СИСТЕМЫ ОБРАЗОВАНИЯ, НАПРИМЕР ВЕЛИКОБРИТАНИЯ ИЛИ СОЕДИНЕННЫЕ ШТАТЫ. ... ОБО МНЕ И МОЕЙ ШКОЛЕ(ME AND MY SCHOOL), . ... А ТАКЖЕ ВАМ ПРЕДЛАГАЕТСЯ ТАБЛИЦА РАЗЛИЧИЙ В НАПИСАНИИ И ПРОИЗНОШЕНИИ СЛОВ СВЯЗАННЫХ С ОБРАЗОВАТЕЛЬНОЙ СИСТЕМОЙ В США(AMERICAN ENGLISH)И ВЕЛИКОБРИТАНИИ(BRITISH ENGLISH)-THE CHART . ...

. Next: String Manipulation Up: C Standard Library Functions Previous: Process Control . #include <stdlib.h> . void *bsearch(void *key, void *base, size_t num, size_t width, int (*compare)(void *elem1, void *elem2)) - Perform binary search. void qsort(void *base, size_t num, size_t width, int (*compare)(void *elem1, void *elem2)) - Use the quicksort algorithm to sort an array. Dave.Marshall@cm.cf.ac.uk . Wed Sep 14 10:06:31 BST 1994

... The hotter the gas, the faster they move, and the more energy each of them holds. The free ions and electrons in a plasma behave the same way. Knowing the temperature of the high atmosphere of Earth, or that of the Sun, we can calculate energies expected of ions and electrons found there. However, ions and electrons actually observed in space are often much , much more energetic, and may move at a respectable fraction of the velocity of light (300,000 km/sec or 186,000 miles/sec). ...

... We have made series of computer runs of the orbital evolution of asteroids for the 3/1 and 5/2 resonances with Jupiter using both the symplectic integrator RMVS3 [1] and the Bulirsh­Stoer method [2] (BULSTO). ... Besides the values of r hc presented in the Table at N = 144, for the 3/1 resonance at N = 24 we obtained r hc equal to 4.0, 1.7, 0.33, 0.4, and 0.7 at '' = 10 \Gamma8 , 10 \Gamma9 , d s = 3, 10, and 30 days, respectively. So in some cases a symplectic method can give large errors. ...

by I.M. Chertok, V.V. Fomichev, A.A. Gnezdilov, R.V. Gorgutsa, V.V. Grechnev, A.K. Markeev, R.W. Nightingale, and D.E. Sobolev . Fig. 2. Inverted TRACE images at 195 illustrating development of the EUV post-eruption arcade with the well-organized loop, two-ribbon, and spine structures. Note that the exposures have been rescaled to the same peak intensity to show the evolution of the bright elements. The field of view is 220.5 by 182 Mm. Back to paper .

... Submitted by Paul Benni on 11/27/2013 18:38:14 . Comet C/2013 R1 Lovejoy (November 8) . Morning image (Nov. 8) of Comet Lovejoy. ... C8 EdgeHD SCT with Hyperstar (f/2.1) and ST-8300C ccd. Image is uncropped from the Hyperstar setup. Compare to my Comet ISON image with the same image scaling. Interesting how much brighter and larger Comet Lovejoy is now compared to ISON. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... Automated Spectral Classification Using Neural Networks E. F. Vieira Laboratorio de AstrofТРsica Espacial y FТРsica Fundamental P.O.Box 50727, 28080 Madrid, Spain, Email: efv@lae#.esa.es J. D. Ponz GSED/ESA, Villafranca P.O.Box 50727, 28080 Madrid, Spain, Email: jdp@vilspa.esa.es Abstract. We have explored two automated classification methods: supervised classification using Artificial Neural Networks (ANN) and unн supervised classification using Self Organized Maps (SOM). ...

APO and Diffuse Interstellar Bands 19822014 Donald G. York University of Chicago APO 20th (30th ?) reunion May 12, 2014 What are Diffuse Interstellar Bands? · 570 interstellar lines between 4000A and 8500A (more to the red, developed by SDSS III IR spectrograph). ... January 7, 1999, first DIB spectra taken, 15 Mon and rho Leo. ... Two stories: a unique star in a nebula And the recent Supernova 2014J in M82 Herschel 36 in NGC 6530 Herschel 36 in NGC 6530, Dumbell Nebula, 33 APO spectra over 13 years. ...

... In this work, we investigate some a new possibility to estimate correlations between radio source position catalogs (RSC). ... Catalogs AUS AUS AUS AUS AUS AUS BKG BKG BKG BKG BKG GSF GSF GSF BKG GSF IAA MAO OPA USN GSF IAA MAO OPA USN IAA MAO OPA USN MAO OPA USN OPA USN GSF IAA IAA IAA MAO With correlations, the system to be solve consists of the equations: The key point is to obtain a reliable estimates of ij. ...

... R.A. = 00h55m04s.86, Decl. = -37 41'43".7 . ... Variable star in NGC 1511 . ... Variable star near Pegasus 2001bn IAUC 8624 BV anon 2001bh 7622 K star ugc11635 2001dh 7482 M star ic5374 1999db 7227 QSO anon 1999dc 7227 AGN anon 1999cx 7210 AGN anon 1999cu 7210 AGN anon 1999bs 7141 cat var ugc11093 1998di 6982 dwarf nova anon 1993U 5818 QSO anon 1993V 5818 QSO anon 1992W 5517 M star mcg 8-23-96 1992X 5517 M star mcg 6-32-24 1991ap 5327 QSO anon 1989Z 5162 var ngc4013 1985J 4059 CV ugc6274 ? ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : "We're light years more advanced than our competition!" ... Even the closest astronomical object, the Moon, is 400,000 kilometers away! ... A beam of light will travel 9,500,000,000,000 kilometers in one year. This distance is defined as a light year ; the distance light travels in a year. ... This is another example of Bad Astronomy; like a light year, a parsec is a unit of distance, not time (to be specific, it equals 3.26 light years) . ...

TOPOLOGY II ASSIGNMENT 5 (SIMPLICIAL HOMOLOGY) Problem 5.1. ... Compute its homology. Problem 5.2. Compute the homology of the singleton and the segment [0, 1]. ... Compute the homology of the subdivided segment Problem 5.4. Compute the homology of the boundary of the triangle and the boundary of the square. Compare. ... Compute the homology of the boundary of the tetrahedron and the boundary of the cube (its faces are triangulated by means of their diagonals). ...

Here we compare the optical properties of porous particles of two kinds: . ... Below we show the behaviour of the efficiency factors Q ext (x), Q sca (x), Q abs (x), the asymmetry parameter g (x) and albedo (x) as well as for x = 3 and 100 the phase function i (theta) and polarization of scattered radiation p (theta) for different values of the parameters m and P . ... factors . ... Qext(x) . Qsca(x) . ... i (theta) . ... albedo (x) . ...

THE 1999 PROJECT . The 1999 Martian Mission project is a further development of the 1988 project. It uses the results of design, research and testing activities that took place at RSC Energia since 1988. As compared with the previous project, changes were introduced into solar array panels which became modular, into lander shape where lifting body was replaced with a "discus", and into the number of the landers, with two landers - a manned lander and a logistics lander - instead of one. ...

... How to Find Us . ... Take a stroll around the beautiful grounds of the Armagh Observatory Astropark. Armagh Observatory's Astropark is a scale model of the Universe where visitors can walk through the Solar System and into the Milky Way and beyond. The landscaped grounds are dotted with stainless steel scale models of the planets demonstrating how small our planet Earth is compared with some of its neighbouring worlds. ... Find out more about the Armagh Observatory Astropark. CONTACT US . ...