Watch RISING Season 4 Episode 18 Online

For more than 60 years, we have been sending satellites and rockets into space. But this progress has polluted Earth's orbit with a host of man-made space debris, creating a fast-moving "junk belt" that poses considerable risk to probes and spacecraft exiting the atmosphere. One individual working to solve this problem is Nobu Okada, head of a startup harnessing the skills and expertise of universities and technical workshops to develop satellites ready to clean up the cosmos.