. Next: Luminosity decay Up: Supernovae and their remnants Previous: The nature of supernovae . љ . Failure of central energy supply . Gravitational collapse . Nature depends on mass . Core mass: . 1.9 - 2.5 M neutron star (type II) . < 1.9 M no remnant (type Ia) . > 2.5 M black hole (type II) . Core collapse causes neutrino emission . Core bounce causes explosion . Few hours delay between neutrinos and light . Jon Bell . Thu Dec 19 15:15:11 GMT 1996

... Gallery . ... Clearing the front offices. Note the collapseтАж . Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: Clearing the front offices. Note the collapsed wall. Description: NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ...

This diagram shows the effect of the 'collapse' value of the 'border-collapse' property. ... The left and right content, padding, border, and margin areas of each cell are labeled by rotated text above each of the areas. Each (red, dotted) grid line bisects the border between two cells. The table width is indicated below the cells as encompassing all the left and right content, padding, border, and margin areas of the cells, except for the cells that touch the sides of the table. ...

... Collapse in Hebes Chasma on Mars . ... 12.08.2014 . ... Inside Hebes Chasma is Hebes Mensa , a 5 kilometer high mesa that appears to have undergone an unusual partial collapse -- a collapse that might be providing clues. ... Material from the mesa appears to have flowed onto the floor of the chasm, while a possible dark layer appears to have pooled like ink on a downslope landing. ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: Mars - Mars-Express . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2014 August 12 . Collapse in Hebes Chasma on Mars . ... Explanation: What's happened in Hebes Chasma on Mars? ... Inside Hebes Chasma is Hebes Mensa , a 5 kilometer high mesa that appears to have undergone an unusual partial collapse -- a collapse that might be providing clues. ... Help APOD: Take the APOD 2014 Calendar Usage Poll . ...

... Tonight's Sky . ... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Animation of a star collapse . ... NASA has announced the detection of a possible strange quark star.Click here to visit the Chandra X-ray Observatory web site and watch an animation of a star collapse.. Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to E-ELT Armazones . ... Survey Telescopes . ... Star Clusters . ... Stars@ESO . ... ESO Science Newsletter . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... ESO 1-metre Schmidt telescope . ... ESO Science Outreach Network . ... A crane collapsing during the construction phase of the ESO 3.6-metre Telescope in La Silla Observatory, Chile. ...

... Denis Puy . ... More recently, Puy & Signore (1995), from this simple description, but with a more complete chemistry (primordial , HD and LiH molecules) considered the three phases of the protoclouds supposed to be initially spherical: i) a linear evolution which approximately follows the expansion, ii) a turn around epoch ( ) when the protocloud reaches its maximum value, and iii) a non-linear evolution or the collapse of the protocloud. ... Puy D. et al. ... Puy D. 1996, A&A, in press . ...

... For this paper: postscript PPEUC CMB index 1 Introduction.. ... We present a new model for the formation of spherically symmetric clusters in an expanding Universe. Both the Universe and the collapsing cluster are governed by the same pressure less fluid equations for which a uniform initial density profile is assumed. ... The computation of photon paths allows us to evaluate the gravitational effects imprinted on a Cosmic Microwave Background (CMB) photon passing through such an evolving mass. ...

... Here is a brief outline of the current theory of the events in the early history of the solar system: . A cloud of interstellar gas and/or dust (the "solar nebula") is disturbed and collapses under its own gravity. ... The gas cools off enough for the metal, rock and (far enough from the forming star) ice to condense out into tiny particles. (i.e. some of the gas turns back into dust). ... Once the larger of these particles get big enough to have a nontrivial gravity, their growth accelerates. ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : If the Sun collapses into a black hole, the Earth and all the other planets will get sucked in. Good astronomy : If the Sun were to collapse into a black hole, we would feel no difference in the gravity as measured at the Earth. ... The same applies if the Sun were to collapse into a black hole. ... Therefore, the gravity of the Sun felt at the Earth would remain the same. ... So it is with the black hole Sun. ... 2008 Phil Plait. ...

... General information . ... Staff . Research staff . Technical, administrative & librarian staff . ... Staff in alphabetic order . Research . Adaptive Optics . ... General interest seminars . ... Information . ... Historical highlights . Historical research . Historical archive . ... Friends of Arcetri . ... Arcetri library . The Observatory building . ... Arcetri in Autumn . ... Adaptive optic test mirror . ... LBT adaptive secondary mirror . ... Arcetri domes . ...

Next: M.E. Bailey, Director Up: Research Previous: C.S. Jeffery, Research Astronomer Contents . ... How do Stars Form? ... Other Work and Activities . ... The interaction of young stars with their surroundings are accentuated within Herbig-Haro Objects, where streams and `bullets' of ejected gas impact on the ambient molecular clouds. ... The astrophysical jets are spectacular. ... Michael Smith and collaborators have searched for, and found, the first evidence of rotation within the jets. ...

... Future seminars . ... Special Relativistic Simulations of Magneto-driven Jet from Core-Collapse Supernovae " . ... We performed 2.5 dimensional magneto-hydro dynamical simulation of core-collapse supernovae. ... How this collimated jet is produced due to the process of core-collapse of massive star?There are two main energy-sources for the explosion. ... Since the previous works are performed separately at each stage such as core-collapse and jet-propagation, many uncertainty remains in each stage. ...

... How How do molecular clouds collapse to form do very young stars evolve? do planets grow in circumstellar disks? ... Real-time protoplanetary/protostellar disk evolution - movies of disks in formation High sensitivity, 2 AU resolution cm-wave observations (100K, 0.2 mas, 8 GHz bandwidth, A/T 10,000) proper motions (Reid ­ Bryden et al 1999) dynamical timescales months-years How do very young stars evolve ? cm-waves probe inner few AU of accretion ...

... Telescopes . ... SAO RAS Anniversary Open Days (April 12-14, 2016) . The International Conference "Dark Ages and White Nights (Spectroscopy of the CMB)" (June 20-24 2016) . ... The International Conference "Multi-spin galaxies 2016" (September 26-30, 2016) . The International Conference "Stars: from collapse to collapse" (October 3-7, 2016) Archive . ... 6-m telescope online . Radio telescope . Telescope Zeiss-1000 online . ... All-Sky online . ... Last update: 28/03/2016 ...

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... Team . ... GRB mini-workshop 2006 . ... 6-meter telescope BTA: . The monitoring of gamma-ray burst afterglows and the study of their host galaxies . Monitoring of core-collapse supernovae and investigation of their host galaxies . ... Supernovae and gamma-ray bursts . ... Are some GRB host galaxies lying in galaxy clusters? ... Supernovae and gamma-ray bursts (Within the scope of the international program "Astronomy in Prielbrusiye") . ... The physics of gamma-ray bursts in the SWIFT era . ...

... If the mass of the collapsing star is more than three solar masses, however, no force can prevent it from collapsing completely to become a black hole. What is a black hole? Mini black holes . ... For Further Reading About Black Holes A black hole is a region of space in which the pull of gravity is so strong that nothing can escape. ... A black hole with a mass less than three solar masses would not form on its own; its gravity is too weak to cause it to completely collapse in on itself. ...

Общая Астрономическая Конференция > Форумы общей направленности > Непознанное, необъяснимое, загадочное > На Венере появился разрыв в облаках? :-о . ... table style = width: 100%; border-collapse: collapse; background-color: #E5EEFF; tr td style = padding: 15px; div style = margin-bottom: 12px; height: 26px; line-height: 26px; text-align: right; font-family: Tahoma, sans-serif; font-size: 11px; color: #000; a href= http ://news.mail.ru target= _blank img src= ...