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00:04:05
On the cliffs above San Francisco's Ocean Beach perches a landmark observatory—a giant camera obscura. Step inside with Robert Tacchetto and see how this centuries-old technology creates enchanting images of the outside world.

00:02:00
Watch the beginning of Venus’s transit across the disk of the sun, one of the rarest astronomical events.

00:02:00
Watch the conclusion of Venus’s 6.5-hour journey across the disk of the sun, one of the rarest astronomical events.

00:03:53
Senior Exploratorium Scientist, Paul Doherty demonstrates how you can make your own sun viewer. You can safely view sunspots, eclipses and transits with this equipment that you may have laying around the house! To learn more about the upcoming Transit of Venus visit: http://www.exploratorium.edu/venus/question3.html

1:14:47
Join us from the front porch of the Exploratorium as we check out today's partial solar eclipse. Learn safe viewing practices, then go outside and watch for yourself!

1:04:05
Watch as the best teachers on the planet battle it out for the title of Iron Science Teacher. This special edition will pit east coast teachers from Columbia University against teachers from the Exploratorium's Teacher's Institute. In this zany competition teachers will have ten minutes to create a science activity from a "secret" ingredient: milk cartons!