Orbital Demonstration

Start Animation

Have a look at the picture to the left and imagine that you are holding the satellite up above the Earth.

What do you think will happen if you "let go"? Press the Start button to see.

That's right, gravity makes the satellite fall straight down to the surface.

Age on Other Planets

Daytime Shadows

The animation below shows how shadows change during the day in the northern hemisphere. Shadows are created when an object, such as the stick below, blocks out some of the Sun's light. The length of the resulting shadow depends on how low or high the Sun is in the sky.

Try moving your mouse pointer over the time symbols to pause the animation at that particular time.