All lessons

130 lessons

• 01Orbits 101BeginnerOrbits5 minLive: SatellitesLive
• 02Why can't you feel the Earth spinning?BeginnerSky4 minLive: GlobeLive
• 03Where does space begin?BeginnerRockets4 minLive: LaunchesLive
• 04How is the Solar System built?BeginnerPlanets4 minLive: Solar SystemLive
• 05What is a satellite, and what does it do for you?BeginnerSatellites4 minLive: SatellitesLive
• 06Why can you see the Moon in the daytime?BeginnerMoon4 minLive: MoonLive
• 07Why do we have seasons?BeginnerSky4 minLive: GlobeLive
• 08Kinds of orbits: polar and sun-synchronousBeginnerOrbits4 minLive: SatellitesLive
• 01Orbital speed: lower means fasterIntermediateOrbits5 minLive: SatellitesLive
• 09The ISS: a home in orbitBeginnerSatellites4 minLive: SatellitesLive
• 10The celestial sphere: why the sky turnsBeginnerSky4 minLive: SkyLive
• 11Constellations: a map made of imaginationBeginnerSky4 minLive: SkyLive
• 12How bright, how far. Reading the starsBeginnerSky4 minLive: SkyLive
• 02The wobbling sky: precessionIntermediateSky5 minLive: SkyLive
• 13How rockets reach orbitBeginnerRockets4 minLive: LaunchesLive
• 03Escape velocity: leaving for goodIntermediateRockets5 minLive: LaunchesLive
• 14Where rockets launch fromBeginnerRockets4 minLive: LaunchesLive
• 15Coming back down: reentry and space junkBeginnerSpace debris4 minLive: SatellitesLive
• 04Kessler syndrome: when debris breeds debrisIntermediateSpace debris5 minLive: SatellitesLive
• 16The living pulse of EarthBeginnerEarth4 minLive: Natural eventsLive
• 17Earthquakes: reading a shaking planetBeginnerEarth4 minLive: EarthquakesLive
• 05Reading a seismogramIntermediateEarth5 minLive: EarthquakesLive
• 18The Moon up closeBeginnerMoon4 minLive: MoonLive
• 19Moon phases: why the Moon changes shapeBeginnerMoon4 minLive: MoonLive
• 06Tides: the Moon pulls unevenlyIntermediateMoon5 minLive: MoonLive
• 20Space weather: when the Sun sneezesBeginnerSun4 minLive: SkyLive
• 21What happens to a human in space without a spacesuit?BeginnerSatellites4 minLive: SatellitesLive
• 22Does a black hole suck everything in?BeginnerSky4 minLive: SkyLive
• 23Can you see the Great Wall of China from space?BeginnerSatellites4 minLive: GlobeLive
• 24Where does the weather forecast come from?BeginnerEarth4 minLive: Natural eventsLive
• 25Why do stars twinkle when planets do not?BeginnerSky4 minLive: SkyLive
• 26What is a shooting star?BeginnerSky4 minLive: SkyLive
• 27Is Saturn the only planet with rings?BeginnerPlanets4 minLive: Solar SystemLive
• 28What is the pale band of the Milky Way in the sky?BeginnerSky4 minLive: SkyLive
• 29Why is the sky blue and the sunset red?BeginnerEarth4 minLive: GlobeLive
• 30How many stars can you really see?BeginnerSky4 minLive: SkyLive
• 31Is the Sun on fire?BeginnerSun4 minLive: Solar SystemLive
• 32Why is Pluto no longer a planet?BeginnerPlanets4 minLive: Solar SystemLive
• 33Why is Mars red?BeginnerPlanets4 minLive: Solar SystemLive
• 34Is the asteroid belt a crowded field of rocks?BeginnerPlanets4 minLive: Solar SystemLive
• 35What is a comet, and where does its tail point?BeginnerPlanets4 minLive: Solar SystemLive
• 36Do the planets ever line up in a row?BeginnerPlanets4 minLive: Solar SystemLive
• 37Why does the Moon look huge near the horizon?BeginnerMoon4 minLive: MoonLive
• 38Why is the Moon covered in craters while Earth has so few?BeginnerMoon4 minLive: MoonLive
• 39Why do hurricanes spin opposite ways in the two hemispheres?BeginnerEarth4 minLive: Natural eventsLive
• 40Can you hear an explosion in space?BeginnerRockets4 minLive: LaunchesLive
• 41Why is Venus hotter than Mercury?BeginnerPlanets4 minLive: Solar SystemLive
• 42Why does the Apollo flag look like it is waving?BeginnerMoon4 minLive: MoonLive
• 43What colour are the stars?BeginnerSky4 minLive: SkyLive
• 44Is Jupiter a failed star?BeginnerPlanets4 minLive: Solar SystemLive
• 45Is Earth a perfect sphere?BeginnerEarth4 minLive: GlobeLive
• 46Where does Earth erupt the most?BeginnerEarth4 minLive: GlobeLive
• 47Is there such a thing as earthquake weather?BeginnerEarth4 minLive: EarthquakesLive
• 48Do astronauts grow taller in space?BeginnerSatellites4 minLive: SatellitesLive
• 49Is there water on Mars?BeginnerPlanets4 minLive: Solar SystemLive
• 50Will the Sun explode as a supernova?BeginnerSun4 minLive: Solar SystemLive
• 07Reading the space weather forecastIntermediateSun5 minLive: SkyLive
• 08Why do rockets throw parts of themselves away?IntermediateRockets5 minLive: LaunchesLive
• 09Why are satellites easiest to see just after dusk?IntermediateSatellites5 minLive: SatellitesLive
• 10Why are the rocky planets close to the Sun and the giants far away?IntermediatePlanets5 minLive: Solar SystemLive
• 11Why does the Moon turn exactly once on each trip around Earth?IntermediateMoon5 minLive: MoonLive
• 12Why are tides stronger at full moon and new moon?IntermediateMoon5 minLive: MoonLive
• 13Why is the Webb telescope parked 1.5 million kilometres from Earth?IntermediateSatellites5 minWebb: this weekLive
• 14A spacecraft fires its engine to catch up: does it gain or fall behind?IntermediateOrbits5 minLive: SatellitesLive
• 15Why is there not a solar eclipse every month?IntermediateMoon5 minLive: MoonLive
• 16Why do you see different constellations in winter and in summer?IntermediateSky5 minLive: SkyLive
• 17Why does Mars sometimes go backwards in the sky?IntermediatePlanets5 minLive: Solar SystemLive
• 18Why does a tsunami grow only near the shore?IntermediateEarth5 minLive: EarthquakesLive
• 19Why can you only fly to Mars every couple of years?IntermediateRockets5 minLive: LaunchesLive
• 20What do sunspots tell us about the next few years?IntermediateSun5 minLive: SkyLive
• 21Why does Venus have phases like the Moon?IntermediatePlanets5 minLive: Solar SystemLive
• 22Why does a day on Mercury last two of its years?IntermediatePlanets5 minLive: Solar SystemLive
• 23Why does the Sun not set in the Arctic in June?IntermediateSky5 minLive: GlobeLive
• 24Why do Saturn's rings seem to vanish?IntermediatePlanets5 minLive: Solar SystemLive
• 25Where did the air of Mars go?IntermediatePlanets5 minLive: Solar SystemLive
• 26How do we know a comet came from another star?IntermediatePlanets5 minLive: Solar SystemLive
• 27Does Earth rise and set in the Moon's sky?IntermediateMoon5 minLive: MoonLive
• 28Why are some earthquakes felt much farther away?IntermediateEarth5 minLive: EarthquakesLive
• 29What does Webb see inside a cloud of dust?IntermediateSatellites5 minWebb: this weekLive
• 30Why do the meteors of a shower seem to come from one point?IntermediateSky5 minLive: SkyLive
• 01Why the TV satellite hangs at 36,000 kmAdvancedOrbits6 minLive: SatellitesLive
• 02How fast the sky turnsAdvancedSky6 minLive: SkyLive
• 03The coincidence that makes total eclipsesAdvancedMoon6 minLive: MoonLive
• 04What it costs to reach the MoonAdvancedRockets6 minLive: LaunchesLive
• 05How far away was the quake?AdvancedEarth6 minLive: EarthquakesLive
• 06Why a small bolt is dangerousAdvancedSpace debris6 minLive: SatellitesLive
• 07Your latitude is written in the skyAdvancedSky6 minLive: SkyLive
• 08How much warning does the Sun give?AdvancedSun6 minLive: SkyLive
• 09How can you work out a planet's year from its distance?AdvancedPlanets6 minLive: Solar SystemLive
• 10How fast must you go to leave the Moon, Mars or Jupiter?AdvancedRockets6 minLive: Solar SystemLive
• 11How much stronger is a magnitude 7 earthquake than a magnitude 5?AdvancedEarth6 minLive: EarthquakesLive
• 12How do slow changes in Earth's orbit pace the ice ages?AdvancedEarth6 minLive: GlobeLive
• 13How much more light does a telescope collect than your eye?AdvancedSatellites6 minWebb: this weekLive
• 14How old is the light you are looking at?AdvancedSky6 minLive: SkyLive
• 15How many Earths would fit inside the Sun?AdvancedSun6 minLive: Solar SystemLive
• 16How much would you weigh on the Moon and on Mars?AdvancedPlanets6 minLive: Solar SystemLive
• 17How far can you see from the space station?AdvancedSatellites6 minLive: GlobeLive
• 18How much sunlight reaches Mars?AdvancedPlanets6 minLive: Solar SystemLive
• 19How far has the Moon moved away during your lifetime?AdvancedMoon6 minLive: MoonLive
• 20How do astronomers measure the distance to a star?AdvancedSky6 minLive: SkyLive
• 21How fast does Earth's spin carry you?AdvancedEarth6 minLive: GlobeLive
• 22Sun or Moon: which raises the bigger tide?AdvancedMoon6 minLive: MoonLive
• 23How strong is gravity on Saturn?AdvancedPlanets6 minLive: Solar SystemLive
• 24How big does Earth look from the Moon?AdvancedMoon6 minLive: MoonLive
• 25How much brighter is a first magnitude star?AdvancedSky6 minLive: SkyLive
• 26How much fuel does a rocket need?AdvancedRockets6 minLive: LaunchesLive
• 27How long does a sunset take?AdvancedSky6 minLive: GlobeLive
• 28How far away was that lightning?AdvancedEarth6 minLive: Natural eventsLive
• 29How deep is the ocean under a tsunami?AdvancedEarth6 minLive: EarthquakesLive
• 30How far have you travelled around the Sun?AdvancedPlanets6 minLive: Solar SystemLive
• 01Will you see the aurora tonight?ExpertSky7 minLive: SkyLive
• 02How long does the junk stay up?ExpertSpace debris7 minLive: SatellitesLive
• 03Will you see the space station tonight?ExpertSatellites7 minLive: SatellitesLive
• 04Briefing before the next real launchExpertRockets7 minLive: LaunchesLive
• 05A big earthquake just struck: what do we know in the first hour?ExpertEarth7 minLive: EarthquakesLive
• 06Where will the falling rocket stage come down?ExpertSpace debris7 minLive: SatellitesLive
• 07Moon, planet or faint galaxy: what is tonight good for?ExpertMoon7 minLive: MoonLive
• 08Will you see the Andromeda galaxy from your balcony?ExpertSky7 minLive: SkyLive
• 09A solar eclipse is coming: will you see it from home?ExpertMoon7 minLive: MoonLive
• 10Take a headline apart: how fast is the Milky Way really moving?ExpertSky7 minLive: SkyLive
• 11Is tonight's meteor shower worth going out for?ExpertSky7 minLive: SkyLive
• 12A solar storm is coming: what really threatens you?ExpertSun7 minLive: SkyLive
• 13An asteroid will "skim past Earth": should you worry?ExpertPlanets7 minLive: Solar SystemLive
• 14A hurricane on the map: how do you read the forecast cone?ExpertEarth7 minLive: Natural eventsLive
• 15A lunar eclipse is coming: when should you set the alarm?ExpertMoon7 minLive: MoonLive
• 16A volcano erupts: will your flight be cancelled?ExpertEarth7 minLive: Natural eventsLive
• 17After a tsunami: when is it safe to go back to the beach?ExpertEarth7 minLive: EarthquakesLive
• 18A Webb picture: what do its colours mean?ExpertSatellites7 minWebb: this weekLive
• 19"Betelgeuse is about to explode": what does soon mean?ExpertSky7 minLive: SkyLive
• 20Supermoon tonight: is it worth waking up for?ExpertMoon7 minLive: MoonLive