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...history of astronomy was the discovery of quasars. When first recognised, in 1963, quasars appeared at radio and optical wavelengths as faint, point-like objects with unusual optical emission spectra. The name comes from their alternative designations of 'quasi-stellar radio source' (QSR) or 'quasi-stellar object' (QSO), meaning that they resemble stars in their...

...families and begin the rehabilitation process after their extraordinary journey. [MUSIC PLAYING] Video 1 The Soyuz spacecraft Activity 9 The Soyuz descent module parachute is activated at an altitude of around 10 km, when the capsule has a velocity of around 900 kph (250 m/s). Using Figure 2 (reproduced here for convenience): [Described image] Figure 2 (repeated)...

...is out of date as I write this in 2005 (ten years is a very long time in the recent history of IT). Taylor wrote an updating paper, Real News Meets IT. I shall be drawing on Real News Meets IT in later sections of this course. In this section, I have reproduced an extract from a book (Higgins, 2004) which introduces the principal elements used by a TV station to get a report for broadcast. Higgins says that his book was ......

...family with. Finally, you’ll use doing and undoing diagrams to change what is being calculated by a formula. This is another aspect of mathematical study that is directly related to building skills for algebra. The final section concentrates on inequalities. These are used in the place of the usual equals sign, to show that something is greater or less than something...

...family of notation! If you want to divide 72 by 8 this can be written in the following ways: 72 ÷ 8, or 72 divided by eight , or 72/8 or eight times 72 Not all division problems will result in a nice whole number answer and you may have a number left over. This number is known as the remainder. The common notation is to show this using the letter R. Now, you’re going...