... Under certain conditions, like those in the nucleus of a QSO, all atoms can be made to emit light at particular wavelengths. ... If that source is approaching the observer, the wave is squashed up onto itself making the wavelength shorter. ... This is redshift. ... You can see how the section of the QSO spectrum which we observe changes with redshift. ... We then see how far we had to slide the observed spectrum along the scale to make it match and that is the objects redshift. ... The 2QZ team . ...

... Moon Phase below . ... ARTICLE: Why the moon always shows us the same face . ... Before you continue reading, you should know that this was not always the case, i.e. the Moon once was rotating with respect to the Earth, so that on every night a terrestrial observer (if there was one, because this was long, long before mankind appeared on our planet, and even before any major animals had appeared) saw another face of the Moon. ... Figure 1 (not to scale) shows how we can imagine the system Earth-Moon...

... 3 Андреев Михаил 211, алг-1 3 Антропов Александр 101, алг-2, дискр-экв3 3 Асташов Евгений 204, оду-1 9 Бажов Иван 207, алг-2, дискр-1, оду-1, экстр-1 3 Богачев Николай 101, алг-3, дискрэкв3, ан-3, экстр-экв3 8 Брагин Владимир 102, шк межд-1, алг-2 2 Бурлаков Даниил 225, мех-3, оду-3 4 Воро бьев Илья 211, дискр-2, вер-2 13 Горинов Евгений 206, алг-2, дискрэкв2, геом-1, экстр-экв2, студмежд-1 6 Григорьев Сергей 209, алг-2, оду-3, геом-1 3 Грибушин Иван 212, дискр-экв2, экстр-экв3. ...