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Shares Astronomy, a friend in my chilhood: Einstein 2010-3-30 09:28; Recently, I have published innumerous blogs about astronomy. To be honest, I myself are not able to write those professional materials and I just found out some of my favorite cards and books relevant to astronomy and then typed them into the computer.But all of you can totally depend on the explan ...; 423 views|4 replies

Shares What is an elliptical galaxy?: Einstein 2010-3-30 08:43; An elliptical galaxy has a telescopic images that reveals a symmetrical distribution of stars in a spherical shape. Such galaxies range from the rare giant elliptical, which extend several hundred thousand light-years across, to dwarf ellipticals of only a few million stars. The dwarf galaxies are ...; 476 views|2 replies

Shares In astronomical terms, what is magnitude?: Einstein 2010-3-29 21:13; Magnitude is the degree of brightness of celestial body, and is based on a scale of ratios, rather than a linear scale. The smaller the number on the magnitude scale, the luminous the body. The brightest star in the solar system has a magnitude of -1.45, and the faintest star visible without opitca ...; 388 views|1 replies

Shares What is a singularity?: Einstein 2010-3-29 21:03; A singularity is the center of a black hole, where the curvature of space-time is at its greatest and gravitational forces compress the infalling mass of a collapsing star or other celestial object to infinite density. It is theorized that no solid obejct hitting the singularity can survive. ...; 272 views|2 replies

Shares What is a nebula?: Einstein 2010-3-29 20:59; A nebula (from Latin, meaning "cloud") us a concentration of gas and dust particles in interstellar space. They exist in our own and other galaxies. Two types are planetary nebulae and diffuse nebulae. Planetary nebulae resemble planets when observed through a telescope and are produced b ...; 402 views|2 replies

Shares What is a galaxy?: Einstein 2010-3-29 20:55; A galaxy is a system of innumerable stars and interstellars matter; billions of galaxies make up the Cosmos. Galaxies vary in size, composition and structure. Nearly all of them are arranged in groups, or clusters, of from a few to as many as ten thounsand members, each with from hundreds of millio ...; 376 views|1 replies

Shares Why do stars appear to twinkle?: Einstein 2010-3-28 12:31; Twinkling occurs when the distant light from a star passes through Earth's turbulent atmosphere and is refracted and scattered by molecules and larger particles of matter. This unsteady refraction makes the light appear to go on and off many times per second.; 262 views|1 replies

Shares What are the planetarty atmoshperes?: Einstein 2010-3-28 12:27; Planetary atmospheres are the gaseous outer component of planets. Mercury, closest to the Sun, has no perceptible atmosphere; Venus, Earth, and Mars have thin atmospheric layes surrounding them; and Jupiter, Saturn, Uranus, and Neptune have such substantial atmospheres that until the 1980s we could ...; 366 views|1 replies

Shares What is a planet?: Einstein 2010-3-28 12:22; A planet is a sphere of rock and/or gas that orbits a star. Planets are thought to be formed out of the disk of dust and gas that encricles a newborn star, their mass and composition determined by the location on the disk where each planet was formed. Some planets are large enough to have a mol ...; 563 views|2 replies

Shares What are inner and outer planets, and how do they differ?: Einstein 2010-3-28 12:12; As the names imply, the inner planets are those closet to the Sun, and outer planets are those fathest from the Sun. Despite the similar refractory compositions, the inner planets do differ from each other. Mercury has an extremely hot, crater-pocked surface; the surface of Venus is a gaseous i ...; 366 views|1 replies

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