Why does the Sun shine?
The Sun is a star, and deep inside it something amazing happens all day and all night. Find out how the Sun makes its light and heat.
Ranki explainsAges 6+5 min
5 questions
Space
Look up. Up there is the Sun, our very own star, the Moon that changes shape, eight planets and more stars than anyone can count. Ranki and Tanki take you on a trip through space.
Why does the Moon change shape?
Sometimes the Moon is a thin smile, sometimes a big round plate. Find out what is really going on, and learn the names of the Moon’s phases.
Tanki explainsAges 6+4 min
What are the planets in our solar system?
Eight planets travel around our Sun, from tiny, scorching Mercury to cold, windy Neptune. Meet them all and learn a trick to remember their order.
Ranki explainsAges 8+4 min
Why do stars twinkle?
Stars seem to sparkle and flicker at night. Find out how moving air makes starlight wobble, and why planets shine with a much steadier light.
Tanki explainsAges 6+4 min
How do astronauts live in space?
Floating breakfasts, sleeping bags on the wall and 16 sunrises a day. Discover how astronauts eat, sleep, wash and stay strong on the space station.
Ranki explainsAges 8+4 min
Keep exploring