Investor interest in the space exploration area has been rising after Elon Musks SpaceXs successfully completed its first manned mission this year. There are a couple of broad trends driving the industry. Firstly, there is a gradual shift from government-driven space programs toward enterprise backed programs. Moreover, new markets appear to be opening up, ranging from reusable rockets, satellite-based Internet, space travel, and point-to-point transport around the earth. Per Morgan Stanley, the global space industry is poised to expand significantly over the next two decades, growing from roughly $350 billion currently to over $1 trillion by 2040. []

Although SpaceX remains privately held, weve picked a theme of a few publicly listed space companies including Lockheed Martin (NYSE: LMT), Aerojet Rocketdyne (NYSE: AJRD), Iridium (NASDAQ: IRDM), and Virgin Galactic (NASDAQ:SPCE) as part of our theme Space Stocks To Watch. Parts of the analysis are summarized below.

Lockheed Martin ($108 billion market cap, +0% YTD), is a diversified aerospace company that also makes satellites and space craft for government and commercial customers. The company is developing the Orion spacecraft that is intended to be used in NASAs human spaceflight programs that will venture into deep space and lunar orbit. The company also provides launch services under the United Launch Alliance partnership with Boeing.

Virgin Galactic ($4 billion, +55%) is an aerospace company focused on suborbital spaceflight for private individuals and researchers. While the company is currently in the test phases and doesnt generate meaningful revenues just yet, things are likely to change in the next few quarters, as it likely begins commercial space flights carrying paying space tourists from 2021, charging each passenger roughly $250,000.

Aerojet Rocketdyne ($3.4 billion, -7%) is an American rocket and missile propulsion manufacturer. While the company derives more than half its revenues from missile defense systems, its space business is also poised to grow considering its contracts with Boeings SLS rocket, Northrops OmegA, and the United Launch Alliances Vulcan rocket.

Iridium Communications ($4 billion, +20%) operates a constellation of satellites that are used for worldwide voice and data communication from hand-held satellite phones and other devices. The company essentially provides communication services across the world, even in areas where there is no cellphone coverage. Iridium largely caters to governments and private sector companies including maritime and aviation solutions.

Did you know that much of SpaceXs valuation comes from its proposed satellite-based Internet service, Starlink? Find out more in our analysis SpaceXs Revenues and Valuation

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The Final Frontier: Space Stocks To Watch - Trefis