Fundamentals
How can falling keep missing Earth?
Falling around a planet
Space and astronomy.
Explore the motions, light and machinery that help us understand the universe.
Fundamentals
Why does the Moon seem to change shape?
Why the Moon changes shape
Fundamentals
Why isn’t there an eclipse every month?
Making Sun, Moon and Earth line up
Fundamentals
Why is winter here summer somewhere else?
Why seasons swap hemispheres
Fundamentals
What can a rocket push against in empty space?
How a rocket pushes through space
Fundamentals
Why discard a spent booster before burning the upper stage?
Leave the spent booster behind
Fundamentals
How can gears reproduce the slower year of Mars?
Gear a Martian year
Fundamentals
How can a planet hide in starlight?
Finding a planet in starlight
Fundamentals
Why must docking be slow and aligned?
A gentle spacecraft docking
Fundamentals
How can a spacecraft turn without pushing space?
Turning with a reaction wheel
Fundamentals
Can sunlight push a spacecraft?
Sailing on sunlight
Fundamentals
Why does a pulsar seem to blink?
A pulsar's sweeping beam
Fundamentals
Why does a telescope need two lenses?
Inside a refracting telescope
13 experiments to explore. No account. Just curiosity.