NASA's Spitzer Space Telescope has spotted seven Earth-sized planets orbiting around a single star. Most importantly, three of those planets are in the habitable zone, which encompasses "the area around the parent star where a rocky planet is most likely to have liquid water."

At 40 light-years or 235 trillion miles from Earth, these planets are relatively close to us. And with NASA's space shuttles retiring this year and private space flight becoming more of a reality with companies like Elon Musk's SpaceX, your nerd dreams of making space your ultimate luxury vacation frontier will probably happen in your lifetime. It's just a matter of affording it.  

Let's take a look at six companies competing for a slice of space exploration. Larger engineering companies like Lockheed Martin (LMT) - Get Report and Boeing (BA) - Get Report are also throwing their hat into the ring for commercial space exploration and it'll be interesting to see which company ultimately benefits the most from interplanetary traveling. 

Jim Cramer, TheStreet's founder and manager of the Action Alerts PLUS portfolio sat down with TheStreet's experts to discuss trading trends in March.

A full rundown of TheStreet's guide to trading in March can be found here:

Image placeholder title

Spaceship names: Dragon Spacecraft and Falcon 9 Rocket
Crazy wealthy backer: Elon Musk of Tesla (TSLA) - Get Report
Fun fact: The company's cargo craft just failed to dock with the space station!

Orbital Sciences
Spaceship names: Cygnus and Taurus 2 rocket 
Backer: Orbital Sciences (ORB) , a publicly traded company
Fun fact: Was just awarded a $78.18 million contract to "provide integration and testing services for the space test program satellite-6 (STPSat-6) through August 2021."

Blue Origin 
Spaceship name: New Shepard 
Crazy wealthy backer: Jeff Bezos of Amazon (AMZN) - Get Report
Fun fact: The company plans on getting civilians into New Shepard for suborbital trips by 2018.

Image placeholder title

Bigelow Airspace
Spaceship names: Sundancer and BA-330
Crazy wealthy backer: Robert Bigelow of Budget Suisse
Fun fact: For the last 16 years, they company has been advancing inflatable habitat technology.

Image placeholder title

SpaceDev/Sierra Nevada Corp.
Spaceship Name: Dream Chaser
Backing: Sierra Nevada Corp., of Sparks, Nev.  
Fun fact: NASA selected the company for anticipated cargo missions to fly between 2019 and 2024.

Virgin Galactic
Spaceship Name: SpaceShipTwo
Crazy wealthy backer: Richard Branson, founder of VirginGroup
Fun fact: The company charges $250,000 a person for membership in the Future Astronauts program and a trip to space.

Image placeholder title