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Shares What is the ergoshpere?(a little confused): Einstein 2010-4-1 10:42; The ergoshpere is a region around a rotating black hole. It is located between the event horizon(the spherical surface that marks the boundary of a black hole) and the static limit(the distance from a black hole where no observer can remain at rest). While a black hole is spinning, it drags o ...; 297 views|0 replies

Shares What is a spiral galaxy?: Einstein 2010-4-1 10:32; Spiral galaxies, which includeour own Milky Way, have a main disk of star 50,000 light-years in diameter and a thickness up to a tenth as great. Embedded in the disk are the spiral arms,, winding out fromthe center like those of a pinwheel. The arms contain the greatest concentration of ...; 329 views|0 replies

Shares What is a comet? A coma?: Einstein 2010-3-31 20:40; A comet is a chunk of frozen gasses, ice, and rocky debris that orbits the Sun. The word comet comes from the Greek kometes, meaning "hairy one", which refers to the tail seen on some comets.A comet's dark, solid core(typically a few miles wide) is surrounded by a gigantic glowing mass called ...; 290 views|2 replies

Shares How do stars form?: Einstein 2010-3-31 18:23; Stars are large gaseous bodies, most of which generate energy through nuclear fusion processes at their cores. The temperature and pressure are high enough in the core for hydrogen nuclei to collide and fuse into helium nuclei, converting matter to energy in the process. Stars are born out of cloud ...; 327 views|2 replies

Shares What are interstellar dust grains?: Einstein 2010-3-31 18:14; Interstellar dust grains are much smaller than household dust; they are a fraction of a micron across, irregularly shaped, and composed of carbon and silicates.The nature and origin of interstellar dust grains are unknown, but they are associated with young stars. These dust grains are absorbent ...; 298 views|2 replies

Shares What are blue and red shifts, and what is the difference between them?: Einstein 2010-3-31 18:07; They are shifts of light toward one end or the other of the visible light spectrum. Light near the blue end of hte spectrum has a higher frequencty and shorter wavelength than light near the red end of the spectrum. A blue shift occurs when the light emitted from a celestial body falls toward t ...; 333 views|0 replies

Shares What is a star?: Einstein 2010-3-31 08:46; A star is a large ball of material- usually hydrogen and helium gas- formed when a diffuse cloud of gas and dust collapses under its own weight. A typical star shines very brightly and is so massive that its core is extremely dense and hot. At the high stellar temperatures, atoms move so fast that ...; 263 views|3 replies

Shares What are an aurora, and what are the names of the two famous aurorae?: Einstein 2010-3-31 08:28; An aurora is a display of radiating light in the night sky, produced when streams of charged particles from the Sun collide with molecules of nitrogen and atoms of oxygen in the atmosphere. Aurorae appear near Earth's magnetic north and south poles because the charged particles are trapped by Earth ...; 341 views|2 replies

Shares What is a neutrino?: Einstein 2010-3-31 08:19; A neutrino is a small elementary particle that has no charge, is thought to have very littel mass, and is believed to be produced in large number by nuclear reactions in stars. Neutrions are hard to detect, since most pass through Earth without interacting with anything. Station of Neutrino ...; 244 views|0 replies

Shares What is a binary star?: Einstein 2010-3-30 09:32; Binary stars are pairs of stars moving in orbit around their common center of mass, At least half the stars in the galaxy have companion, or binary stars. These dual star systems change if one star ages more rapidly than its companion and dies out. If the two stars are very close to each other, gas ...; 275 views|2 replies

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