Start with a real view of the sky. Explore glowing air, changing moonlight, falling orbits and the evidence behind distant discoveries.
Interactive explorationBegin with a real view from the space station. Then prepare two glowing populations, make collisions matter, and discover how atmospheric light, particle energy and a camera’s record fit together.
Interactive explorationMove the Moon around Earth and compare two viewpoints at once. Make a crescent, then tilt the orbit to discover why an eclipse is a special alignment.
Interactive explorationDraw a velocity arrow, predict a path and compare two spacecraft on one clock. Follow a real NASA Earth map, inspect the next moment of free fall and discover why speed alone cannot make a circle.
Interactive explorationInspect the real EHT observation, then choose a direction in a calculated light map. Follow its exterior path, find its source and reveal two images of one tiny patch.
Interactive explorationOpen a generic engine, follow what it carries and keep every bit of expelled mass in the story. Change who measures the motion, balance the thrust terms and discover what staging actually changes.
Take these steps at your own pace. Your place is not saved as account progress or scored.