Home > Physical Science
In this program on temperature, we get down to the atomic level to explain how hot things are different to cold things. We describe what a temperature scale actually tells us, and demonstrate how scientists measure the amount of heat energy that water absorbs when it’s heated.
Copyright Date: 2019
In this program, we look at the differences between solids, liquids, and gases, and at why things change state when they absorb or lose heat energy. We also look at the strange example of carbon dioxide, which doesn’t follow the same rules that that most other substances do!
In this program, we look at the fact that substances expand when they get hot and contract when they get cold and we explain why they do. We look at how thermal expansion can be a real nuisance, but also how we can put thermal expansion to good use for the good of the world!
In this program, we look at the temperature scale that in many ways is superior to the Celsius and Fahrenheit scales. Zero on the Kelvin scale is equal to -273°C. And why is -273°C so special? Because that’s the coldest temperature you can get!
In this program, we look at the three ways that heat energy can transfer from one thing to another: conduction; convection; and radiation. A heat source is useless if heat energy can’t transfer from the heat source to whatever you want heated. Understanding heat transfer is essential if you want to cook good food and if you want to stay warm when it’s cold and stay cool when it’s hot.
Discovery of the TRAPPIST-1 solar system in 2015 was a game-changer; its red dwarf star is surrounded by seven Earth-sized planets, making it a first-of-its-kind find. Battle of the Exoplanets examines this unusual system and asks what progress has been made in the search for life onother planets.
Geoengineering is an ambitious set of methods proposed by scientists to help mitigate the effects of climate change. And one type in particular—solar geoengineering—has been the subject of growing debate. Solar geoengineering involves several techniques, including injecting reflective particles into the stratosphere to reduce the amount of solar radiation and heat that reaches the Earth. This proc...
De-extinction describes the process of creating an organism that belongs to or closely resembles an extinct species. While this process was once a science-fiction fantasy explored in films like Jurassic Park, recent biological and technological breakthroughs suggest that reviving extinct creatures, like the passenger pigeon and the woolly mammoth, could soon become a reality. The benefits of de-ex...
Since it explored Pluto in 2015, the New Horizons spacecraft has been zooming toward NASA’s most distant target yet. Join the mission team as the probe attempts to fly by Ultima Thule, an object 4 billion miles from Earth.
Copyright Date: 2019
Apollo astronauts and engineers tell the inside story of how the first mission to the moon, Apollo 8, pioneered groundbreaking technologies that would pave the way to land a man on the moon and win the space race.
Copyright Date: 2018
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