Earth & Space Science
This programme is about seawater. It is the most important liquid on Earth, not only from its sheer volume, but also because it has remarkable qualities. A few of them, like buoyancy, are common to all liquids - but seawater is also the cradle of life. Three key factors of water underpin life in the sea: water’s dissolving power, its tendency to keep a stable temperature, and its transparency to light. This programme explains the mechanisms and the outcomes of these key facts—and other things—that make seawater both weird and wonderful. Show Less
"Land and Ocean" examines who the world's land masses and oceans affect global climate patterns. We look at why the air gets colder and colder the higher you go, why coastal regions don't heat up or cool down as much as inland regions, why winters are colder in the northern hemisphere, and a whole lot more Show Less
In this episode, we describe how tropical cyclones form and examine their huge power. We explain what the Coriolis effect is and how it make tropical cyclones rotate the way that they do. We also travel to three continents to demonstrate how Coriolis effect affects water draining from a small container. Does water really swirl in a different direction depending on which hemisphere it is in? Show Less
"Following the Sun" looks at how the sun's movement across the sky every day changes. In summer, the sun reaches a much higher angle in the sky than it does in winter. This affects the design of energy-efficient homes and the placement of solar panels. Show Less
This video explains convection and global wind currents, and looks at the formation of thunderstorms.
This video defines and discusses human and natural pollutants of air and their sources.
Of all the man-made satellites in Low Earth Orbit, 95% are space junk: rocket thrusters, derelict satellites, and most of all, tiny fragments of debris from collisions and explosions. All this debris poses a potential threat to the future of space travel if we don't find a way to clean it up before it's too late. Kessler Syndrome, the threat of cascading orbital debris fallout, is an environmental crisis that's almost completely invisible to us, but which may carry dire consequences for our infrastructure and the future of spaceflight if left unchecked. Show Less
The series of changes that occur in an area having no soil and living organisms is called primary succession. Species like mosses and lichens, the pioneer species, are the first to populate an area. When these organisms die, they form a thin layer of soil and enrich it with nutrients. Then, the plant seeds start growing on the newly - formed soil. Show Less
The Earth gets all its energy from the Sun. The amount of energy the Earth receives from the Sun is balanced by the amount it loses to space. An increase in the concentration of greenhouse gases affects the Sun - Earth energy balance and causes global warming. Show Less
This video explains how the movements and position of the Earth in space determine the day and night, the seasons and the very existence of life on our planet.
In this update of our classic programme, we explore important features of the universe through easy to follow, stunning visuals and graphics. Learn about our galaxy home, the Milky Way, and some of the billions of stars it contains including our Sun and closest neighbour, Alpha Centauri. The characteristics of different types of stars and the changes they experience during their life cycle are described. Show Less
Come on a voyage through the solar system and discover the size, orbits, rotations, moons and other fascinating facts about the Sun and the eight planets orbiting it. This clip also describes some of the spacecraft and missions that have provided us with all the information we know about the solar system and its planetary inhabitants. Show Less