All stars derive their energy through the thermonuclear fusion of light elements in to heavy elements. High temperatures are required so that the mutual electrostatic repulsion of the protons in each fusing atomic nucleus is overcome. ... Elements with more protons in their nuclei require higher temperatures. ... This sequence is now shown in the animation below. ... First Step of the Proton-Proton Chain Narration . Second Step of the Proton-Proton Chain Narration . ...

... Star Formation in Irregular Galaxies: Current Knowledge and Unanswered Questions . ... Current . Missions . ... Future Missions and . ... Missions Office . ... Research . Research Staff Directory . ... I will stimulate discussion on the internal star formation processes in non-interacting irregular galaxies by examining five interrelated questions: What regulates star formation? ... How do star formation rates of current systems compare with those of more distant galaxies? ...

What happens to a star heavier than five solar masses? ... Stars about ten solar masses probably behave like our five solar mass star until they reach the end of core-helium burning. ... The Crab nebula was formed after a massive explosion ripped a star apart in 1054. ... Today, the glowing outer layers of the star are still rushing away from a tiny star in the centre. ... An incredible explosion rips through the outer layers of the star, releasing colossal amounts of energy in a supernova explosion. ...

... 1b. Pole Star . ... Two bright constellations occupy opposite sides of the pole star--the Big Dipper and Cassiopeia . ... The Big Dipper consists of 7 bright stars, forming a dipper, a small pot with a long handle. ... It shows the 7 stars of the Big Dipper and Polaris, the north star. ... Ursa Minor , the "Small Bear" or "Little Dipper" is a constellation somewhat resembling the Big Dipper, and Polaris is the last star in its tail. ... Questions from Users: About the stars of the Big Dipper . ...

... NASA Explanation: Galaxies are made up of stars, but are all stars found within galaxies ? Using the Hubble Space Telescope, researchers exploring the Virgo Cluster of galaxies have now found about 600 red giant stars adrift in intergalactic space . ... Possibly ejected from their home galaxies during galaxy-galaxy collisions , these isolated suns may well represent part of a large, previously unseen stellar population, filling the space between Virgo Cluster galaxies. ... Galaxies Away . ...

GJ 849 . HIP 109388 . ... Расстояние от Солнца . ... 0.52+0.07 . ... открыта в 2006 году . ... Расстояние в перицентре - 2.29 а.е. Расстояние в апоцентре - 2.49 а.е. GJ 849 c . Расстояние в перицентре - 4.4 а.е. Расстояние в апоцентре - 5.24 а.е. Радиус эффективной земной орбиты (показана зеленым цветом) - 0.2 а.е. Новости о системе: . ... 2 HD 145934 b и GJ 849 c: прохладный гигант у красного гиганта и очень холодный гигант у красного карлика (+ обновлены данные еще нескольких планет) ...

... A star party is a gathering of amateur astronomers who set up their telescopes and observe the dynamic night sky. ... Star parties are best scheduled during first quarter and waxing gibbous Moon. During full moon, the moon is so bright it obscures a view of other celestial objects and even the Moon is best viewed when NOT full. ... We will consult local weather forecasters and make a decision by 2:00p on the day of the star party. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... Tonight's Sky . ... Observing . ... Star Atlas . ... Does dark matter collect into dense concentrations like stars? ... In fact, there is strong evidence today for the existence of dark matter halos spherical clumps of dark matter centered around every galaxy that extend 10 times larger than the radius spanned by the galaxy s stars. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter...

Next: The ``Reflection'' Effect Up: Ejectors in Massive Binary Previous: The Radiopulsar PSRB1259-63 - a . The radiopulsar PSRB1259-63 in a massive binary has an extremely high eccentricity (Johnston et al. ... We have assumed that explosion occurs at a random moment on the orbit and all the mass thrown off by a star instantly leaves the system because the characteristic velocity of matter from the exploded star is much higher than the orbital velocity. ...

... You try to stop him to ask questions but you have no chance. He's talking faster and faster and going through stars one after another. ... But there is no answer. ... On top it says "Chez Stella -- Serving the Stars for 15 Billion Years." ... It contains three carefully drawn graphs labeled "Evolution of the Sun," "Evolution of a 25 Solar Mass Star," and "Temperature Changes in Six Stars." ... P.S. Should any other questions occur to you, remember you are always welcome at Chez Stella. ...

Next: Discussion Up: Other Stars Previous: Stars with Less . While periods were detected on 59 of 105 stars monitored only 12, ten in Orion OB1a and OB1b plus TAP 26 and P1724, had detections with FAP's below 1%. This seems consistent with results from the Van Vleck Observatory. ... The Van Vleck Observatory has reported periods for 75 stars (Choi & Herbst 1996) and variability has been seen in 186 stars (Attridge & Herbst 1992) over four years. ... Thu Dec 5 13:29:36 EST 1996 ...

... February 3, 1997 . Stars Without Galaxies . ... NASA , . ... Using the Hubble Space Telescope, researchers exploring the Virgo Cluster of galaxies have now found about 600 red giant stars adrift in intergalactic space . ... Possibly ejected from their home galaxies during galaxy-galaxy collisions , these isolated suns may well represent part of a large, previously unseen stellar population, filling the the space between Virgo cluster galaxies . ... About APOD > . ... NASA Technical Rep.: ...

Maria-Rosa Cioni - University of Edinburgh / University of Hertfordshire The Magellanic Clouds as a template for the study of stellar populations and galaxy interactions CSIRO (Australia), 16-17 July 2007 Introduction MW LMC ? ... A "biased" view of the MCs (highlights) Near-IR Upper RGB & AGB stars Number density - morphology & structure C/M ratio - metallicity (Fe/H] Ks mag - variation of mean age & metallicity Opt. ... O-rich AGB C-rich AGB RGB & others Cioni et al. ...

... Science . ... The goal is to bring together two communitities: the one working on star formation (mostly galactic) and the one working on the formation of young massive clusters (mostly extra-galactic). We will link galactic with extra-galactic work, optical/NIR techniques with sub-mm/mm/radio ones, the formation of stars with the one of massive star clusters - observations and theory. ... Coordinated by Marina Rejkuba (abstract) . ... How did star formation proceed in Globular Clusters? ...

... Bad Astronomy . ... Bad Astronomy: The North Star, Polaris, is a very bright star. Good Astronomy: Polaris is a middling-bright star, easily missed. ... He said it was close to Polaris, the North Star, but he also said it was in the East. ... It's natural, I suppose, to think that such an important star should be bright, but really, that's a conceit, like thinking that the Earth is at the center of the Universe. If more people knew just why Polaris is the North Star, this Bad Idea would stop. ...

... For more distant stars we must use other techniques. ... Hence if we see a distant galaxy and can pick out any cepheids lying within it, we can calculate its distance. ... Here then is another method to gauge the size of the Universe and there are yet more. volume at high enough temperature a nuclear fusion reaction sweeps across the white dwarf's surface and eventually we will see a spectacularly bright new star (hence nova) in our skies. ... Why is this relevant to the size of the Universe? ...

... Further uncertainty is added by most Pleiads sharing names with otherwise unrelated mythological characters. ... The Pleiad(e)s were the seven daughters of Atlas and Pleione, and half-sisters of the Hyades, whose mother was thra (`bright sky'; a different thra than the mother of Theseus). They were perhaps also half-sisters of the Hesperides, who were daughters of either Night alone, or Atlas and Hesperis (`evening'), or Ceto and Phorcys. ... Another Asterope was daughter of the river Cebren. ...

Next: Saving the Data Up: The Reduction Session Previous: Flat Field correction . In the scheme described in the previous Section, the correction for the blaze function and for the chromatic response is done using standard stars. When the input data sets do not include standard stars it is possible to correct for the blaze function using a model of this effect as described in Chapter . ... where input is the raw image, . command MERGE/ECHELLE output name order1,order2 NOAPPEND . ...

... Development of Ideas of Structure and Evolution of Stars. Integral Features of Stars, Which Determine Their Structure, Direction and Rate of Evolutuion. ... Connection between Potential and Thermal Energy of Star. ... Structure of a Main Sequence Star. Features of Massive Stars Evolution on the Main Sequence. Internal Structure of the Sun. ... White Dwarfs, Their Features. ... Evolution from the Main Sequence of Massive Stars. ... Evolution of Small Mass Stars till White Dwarfs Sequence. ...

Blackholes2 Forum Message . Forums: . ... Discussion Forums | ... Dark Energy Stars, Universal Time And The Godel Universe . Forum List | ... Post Message | ... I recall a number of discussions of universal time of one of these forums. ... Dark Energy Stars . ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...