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...systems operate to form our environment. Every planet except one in the Solar System has a gaseous atmosphere, as do some moons and even some dwarf planets. Why does the Earth’s atmosphere make it so perfect as a home for life? The Earth’s atmosphere The atmosphere is thin and light, a gas that is only bound to the solid mass of the Earth by gravity. The mass of the...

...systems are in place. The material forms part of the course MU120 Open Mathematics... Open Mathematics A short introduction to this album. Running Trains Safely Steam trains in the valley of the River Severn - ensuring the train service meets customer demand and ensures safety. Journeys as Graphs The timetable in action and the practical challenges a timetabler faces....

...systems function smoothly? This album focuses on the different roles of B.Braun, a large supplier of medical equipment which also provides customised services for patients. In this time-critical setting, their supply chain processes must be organised with scrupulous efficiency. This material forms part of The Open University course T882 Supply chain innovation, strategy...

...systems and primary energy sources understand the key role of the sun as the main source of renewable energy understand the concepts of energy, power, the difference between them and the essential units used to describe them. The Open University would really appreciate a few minutes of your time to tell us about yourself and your expectations for the course before you...

...system. It was last at perihelion (its closest approach to the sun) in 1995. Each time the comet comes to the inner solar system, it sheds dust. Over time, this debris has built up, and is smeared out along the entire track of the orbit. Once a year, in August, the Earth’s orbit crosses that of comet Swift-Tuttle, and dust from the comet is captured. If you record a...