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Shares Exert all my efforts to study TOEFL: Einstein 2011-7-19 12:06; Last night, after eight and a half hours' train travel, I arrived in Tianjin again and went back to my Alma Mater, Tianjin University. I came back for only one thing-- proceed a serious preparation for my coming TOEFL test and see what level I can achieve after knowing and practising all the ne ...; Individual Classification: TOEFL|1228 views|9 replies

Shares hi, there: Einstein 2011-1-16 22:14; Hello, everybody. After one year, I finally come back to DioEnglish. In the past year, I have been through a lot. I learned how to cope with tough issues, how to negotiate with strange guys, how to stick to your principle in the face of temptations and lure, and most importantly, how to respect ev ...; Individual Classification: TOEFL|969 views|15 replies

Shares My last blog on stronomy- What is the difference between periapsis and apoapsis?: Einstein 2010-4-4 10:21; Periapsis is the closet point on an orbit to the primary body. When referring to object orbiting these heavenly bodies, we use the following: Body ...; 1108 views|6 replies

Shares What is a Cepheid?: Einstein 2010-4-4 10:15; A Cepheid is a pulsating variable star. This type of star undergoes a rhythmic pulsation indicated by its regular pattern of changing brightness as a function of time. The period of pulsation has been shown to be directly related to a Cepheid's brightness, making observations of stars one of the mo ...; 985 views|3 replies

Shares What is the Hubble Constant?: Einstein 2010-4-4 10:07; The Hubble Constant refers to the rate at which the universe is expanding, and can be used to determine teh brightness and masses of stars in galaxies and galaxy clusters, and to calculate the amount of dark matter present inthe universe.It also provides a basis tests of theoretical cos ...; 947 views|0 replies

Shares Where does the Sun get its energy?: Einstein 2010-4-4 09:46; The Sun's energy comes from the nuclear conversion of hydrogen to helium deep within its core. The temperature in the core is about 15,000,000k, and the pressure is many billions of times that of Earth's atmosphere at see level. The energy released in the Sun's core by nuclear processes slowly w ...; 703 views|2 replies

Shares What is a Doppler shift?: Einstein 2010-4-4 09:41; A Doppler shift is the change in wavelength of sound or light waves resulting from the relative motion of teh wave source and the observer with respect to each other. As an object moves closer to an observer its emanating waves are compressed, or shortened, and there is a rise in pitch or wave freq ...; 472 views|0 replies

Shares What is a light year?: Einstein 2010-4-4 09:33; Light travels at a rate of 186,000 miles per second. A light-year is the distance light can travel in the space of a year. Earth is about 4.3 light-years from its nearest star, Alpha Centauri. This means it takes 4.3 years for the light from this star to reach Earth.; 451 views|0 replies

Shares What are Apparent Time, Mean Time, Sidereal Time, and Universal Time?: Einstein 2010-4-3 13:59; Apparent Time(AT), or Solar Time, is time calculated dependent on the motion of the Sun, as on a sundial. A clock reads Apparent Time only if it is located at the proper longtitude within a time zone. Mean Time(MT), sometimes called Civil Times, is calculated using the Mean Solar day(precesily ...; 897 views|1 replies

Shares What is the difference between the photosphere and the chromosphere?: Einstein 2010-4-3 11:44; The photosphere is the thin, opaque surface layer of the Sun that raidates most of the Sun's energy. It has a temperatur of about 5,800k. The chromosphere is the lower level of the solar atmosphere, lying between the photosphere and the uppermost leve, the corona. It is the thin layer of relativ ...; 2373 views|2 replies

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