Here are few of museums that you can visit without spending a dollar:
Here you can find hundreds of activities about science and technology, or math and engineering. There is a section with robots and outer space. Rock Climbing at the massive Science Playground. Design Lab, a place where visitors can learn about design and engineering process through games. This cool museum has free entry on Fridays from 2:00 PM until 5:00 PM, and Sundays from 10:00 AM to 11:00 AM.
Location: 47-01 111th St, Corona, NY 11368