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Neil Armstrong was the first man to walk on the moon in 1969 and declared the feat "one giant leap for mankind". Forty-five years later, there are slew of companies wanting to make space travel as regular as airplane trips.

Aerospace market researchers Futron said revenues in the sector could hit $676 million by 2021. In 2012, George Nield, associate administrator for the Federal Aviation Administration's Office of Commercial Space Transportation said space tourism could be a billion-dollar industry in the next 10 years.

Companies including Richard Branson's Virgin Galactic and Elon Musk's SpaceX are among those seeing opportunities in the commercial space market.

Here are some top space travel opportunities that are out of this world.

- By CNBC's Arjun Kharpal

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