A Journey Through the Heaven by Jayant V. Narlikar PDF

By Jayant V. Narlikar

ISBN-10: 8123700261

ISBN-13: 9788123700267

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The material blown out often appears as an illuminated ring surrounding the star, and is called a 'planetary nebula ' . A star exhibiting minor explosions or flares at the surface is called a 'nova star' . The core that is finally left is very hot bur as a star it does not radiate much energy in the visible range. Such a star is called a white dwarfon the H-R diagram . Wit h a density one million times that of water , a handful of material from a white dwarf would contain several tons of matter.

II-' - I-ITI ' III I II 1 -_ . 000 km s- ' Bootes 3,960,000,000 III ," 11-' - -- I ii ' -i i -I II I Photographs of galaxies and their spectra with the H andK absorption lines of calcium. The lines are more red-shifted for fain.. ter galaxies and hence Hubble concluded that fainter galaxies, being farther, recede faster than the nearer brighter ones. 000 xm e" Hydra A.. tIIU. _ ............. ",Iodll" , , dA/ A. " " - llMIlctt. ,lit·,.. SX10- "It. f1,fI. Illl It. 0... "lfl ~ botll • •S " 11119" ...

Figure shows that the matter falling into the black hole forms a disc round it, called the 'accretion disc'. times the mass of the Sun will become a black hole when its diameter is only 30 kilometres. How do we 'see' a black hole if it cannot emit any light? We can in principle, detect its existence by examining its environment. For , invisible though it is, the black hule continu es to attract other matter from its surroundings. A black hole revolving around another star can pull gas from its surface.

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A Journey Through the Heaven by Jayant V. Narlikar

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