Experience the Exploratorium. Let your curiosity roam free through hundreds of exhibits in our six spacious indoor and outdoor galleries at Pier 15, San Francisco.

Eclipses can be mystifying experiences. Traditions from around the world imagine the eclipse as everything from the Sun being eaten by monsters to an intimate meeting with the moon. Here, we explore ...

Fill in your weight below in the space indicated. You can enter your weight in any unit you wish. Click on the "Calculate" button. Notice that the weights on other worlds will automatically fill in.

Make dendritic diversions and bodacious branches. Lightning bolts, river deltas, tree branches, and coastlines are all examples of patterns in nature called fractals. In this Snack, you get a striking ...

Artist Bob Miller's Light Walk at the Exploratorium will change the way you look at light, shadow, and images.

What Are the Three Types of Solar Eclipses?

Then, in the final seconds before the moon completely covers the Sun, there is a last bright flash, combined with an emerging view of the corona—the Sun’s upper atmosphere—encircling the moon. This ...

Note that as the distance of the planet from the sun is increased, the period, or time to make one orbit, will get longer. Kepler didn't know the reason for these laws, though he knew it had something ...

The Big Bang theory raises some important questions about the fundamental nature of the universe: Will the expansion of the universe, set in action by the Big Bang, continue forever? Or will gravity ...

A rotating black-and-white disk produces the illusion of color. Rotate this black-and-white pattern at the right speed, and the pattern appears to contain colored rings. You see color because ...

Now we have great tools like spreadsheets to do the numerical computations for us. Below you can download OpenOffice (or Libre Office), Apple Numbers or Excel format files. In these spreadsheets, you ...

Another popular system called a diagrammatic cipher, used by many children in school, substitutes symbols for letters instead of other letters. This system is, in essence, the same as the letter ...