... The Thickness of Stellar Disks in Early-type Galaxies E. M. Chudakova* and O. K. Sil'chenko ** Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia Received August 19, 2013; in final form, October 30, 2013 Abstract--We suggest and justify a new photometric method enabling the derivation of the relative thickness of a galactic disk from the two-dimensional surface-brightness distribution of the galaxy in the plane of the sky. ... The galaxies are non-interacting. ...
... Hypothesis Paper Finding a Second Sample of Life on Earth P.C.W. DAVIES1 and CHARLES H. LINEWEAVER2 ABSTRACT If life emerges readily under Earth-like conditions, the possibility arises of multiple terrestrial genesis events. ... We find a significant likelihood that at least one more sample of life, referred to here as alien life, may have emerged on Earth, and could have coexisted with known life. ... Key Words: Origin of life--Biogenesis--Impact frustration. ... Earth Planet. ...
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Ссылки http://www.mso.anu.edu.au/~charley/papers/DaviesLineweaverOnline05.pdf -- 123.0 Кб -- 19.04.2005 Похожие документы
ELT MASS/DIMM instrument for atmospheric turbulence measurements. ... 1.2 Principal geometry of MASSґDIMM device . ... The next chapter is a guide for alignment of the optical scheme elements ґ the op eration which is mandatory after the device assembly or while installing the device on the telescop e. Exit pupil optics tuning (MASS segmentator and DIMM mirrors), fo cusing and lateral p ositioning of the Fabry lens, checking the entrance pupil p osition are the sub jects of particular attention. ...
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Ссылки http://curl.sai.msu.ru/mass/download/doc/elt_description.pdf -- 874.8 Кб -- 11.09.2006 Похожие документы
... 000, 1ґ13 (2010) Printed 21 September 2011 A (MN L TEX style file v2.2) A universal ultraviolet-optical colourґcolourґmagnitude relation of galaxies I1gor V. Chilingarian1,2, and Ivan Yu. ... Received 2011 Sep 15; in original form 2011 Feb 6 ABSTRACT The bimodal galaxy distribution in the optical colourґmagnitude diagram (CMD) comprises a narrow "red sequence" populated mostly by early-type galaxies and a broad "blue cloud" dominated by star-forming systems. ...
... Planets, moons, asteroids and comets contain resources such as water and minerals, valuable to astronauts and potentially to Earth, with other elements such as platinum as a byproduct of the extraction. ... Lewis hoped we could defray cost s b y "bringing inexpensive products down to Earth. ... We could make travel to Mars cheaper by "bringing just enough fuel [to get there], then use the Martian CO2 atmosphere to go home. One ton of equipment will be able to produce 100 tons of fuel." ...
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Ссылки http://www.aaa.org/EyepieceFiles/aaa/2008_04_April_Eyepiece.pdf -- 698.2 Кб -- 22.02.2015 Похожие документы
... Bad Astronomy . ... Mad Science . ... I want to know if a space colony or large sattelite was established at any Lagrange point, like L5, would another Colony or sattelite have to be placed at L4 in order for the earth's orbit to remain stable? ... In the late 1700s, French mathematician Joseph Lagrange discovered that if you have a massive object orbiting another massive object (say, the Earth orbiting the Sun), there exist five points of equilibrium where the forces all balance. ... 2008 Phil...