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...History and Theory of the Heavens. Today, our understanding of protoplanetary discs stems from experimental observations and theoretical models of the behaviour of gases in the gravitational fields of stars...The formation of exoplanets: 1.1 Observations of protoplanetary discs - The presence of discs around newborn stars is a natural consequence of the collapse of the...

...family and employers, and on social media. Badges are a great motivation, helping you to reach the end of the course. Gaining a badge often boosts confidence in the skills and abilities that underpin successful study. So, completing this course should encourage you to think about taking other courses, for example enrolling at a college for a formal qualification. (You...

...family go on holiday together. They each pay £155. What is the total cost of the holiday? You make an insurance claim worth £18 950. The insurance company pays you £12 648. What is the difference between what you claimed and what you actually received? You go to the local café and buy a coffee for £2.35, a tea for £1.40 and a croissant for £1.85. How much do you...

...family and employers, and on social media. Badges are a great motivator, helping you to reach the end of the course. Gaining a badge often boosts confidence in the skills and abilities that underpin successful study. So, completing this course should encourage you to think about taking other courses. ['Discovering chemistry' digital badge] Getting a badge is...

...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...