The Pale Blue Dot is a photograph of planet Earth taken in 1990 by the Voyager 1 spacecraft from a record distance of about 6 billion kilometers from Earth, as part of the solar system Family Portrait series of images. In the photograph, Earth is shown as a tiny dot (0.12 pixel in size) against the vastness of space. The Voyager 1 spacecraft, which had completed its primary mission and was leaving the Solar System, was commanded by NASA to turn its camera around and to take a photograph of Earth across a great expanse of space, at the request of Carl Sagan.
This is an animated version of Carl Sagan's famous audio-text about The Earth, pale blue dot
Several TV series and programs help us to study by showing or demonstrating some science processes. For example Bill Nye, the Science Guy and The Magic School Bus. You may consider this last one for kids but try and enjoy it.
Take a look at these videos or listen to the song. You can review the water cycle with them. You will learn stages and processes of the water cycle. Or you can have a summary of water by ticking here.