Avenue Franklin Delano Roosevelt, 75008 Paris France
The Palais de la Découverte is the museum of science. Its permanent exhibitions are on the subjects of astronomy, chemistry, geosciences, mathematics and physics. See the list of current and permanent exhibitions at the museum's website.
The museum is equally interesting for kids and adults. It is located in the Grand Palais. Admission to the museum is a part of the Paris Museum Pass, but if you don't have one, you can buy tickets online or at the museum (best to buy online to avoid queues at the museum).