Space Exploration Technologies Corp. said it has raised $1 billion from two new investors, Google Inc. and Fidelity Investments, in a move aimed at supporting space transportation and satellite manufacturing.

Google and Fidelity will collectively own just under 10% of the company, SpaceX said in a statement on its website. The Wall Street Journal reported the possible investment Monday.

The investment would value SpaceX, backed by Tesla Motors Inc. Chief Executive Elon Musk, at more than $10 billion, according to a person familiar with the matter. The financing will support the company's nascent plans to deliver Internet access via satellites, the person said.

The deal represents Google's latest effort to use futuristic technology to spread Internet access to remote regions of the world, alongside high-altitude balloons and solar-powered drones. By extending Web access, Google increases the number of people who can use its services.

Google and Fidelity join existing SpaceX investors Founders Fund, Draper Fisher Jurvetson, Valor Equity Partners and Capricorn.

Google has been considering satellite-based Internet service for more than a year. In late 2013, it hired satellite-industry veteran Greg Wyler, who at one point last year had more than 10 people working for him. Mr. Wyler left Google last summer and is now developing his own satellite-Internet venture.

SpaceX builds and launches rockets and spacecraft. Mr. Musk last week described a general concept for SpaceX to launch hundreds of satellites into relatively low orbit to deliver Internet access across the globe. Mr. Musk told BusinessWeek the project could cost $10 billion to build and take at least five years, but gave no details about funding or manufacturing plans.

For several months Mr. Musk has been considering ways to expand SpaceX's rocket-and-spacecraft manufacturing operations to designing and building satellites, according to aerospace-industry officials who have talked with him. Though short on specifics, his latest comments were the clearest sign yet of a long-term commitment to such expansion plans.

It is likely to take years to establish designs and potentially set up a specialized satellite-making facility. But SpaceX already has some important building blocks. Industry officials said the company builds its own navigation and flight-control systems for spacecraft, which could provide some elements for satellites. There also are synergies between parts SpaceX makes today for solar arrays on spacecraft and such devices intended for satellites.

One big technical and financial challenge facing the proposed venture is the cost installing ground-based antennas and computer terminals to receive the satellite signals. That issue has bedeviled some earlier Internet-via-satellite projects and threatens to complicate Google's efforts, satellite industry officials and consultants say.

Another unanswered question is how SpaceX plans to transmit Internet signals to Earth. The company isn't believed to control rights to radio spectrum.

Mr. Musk has discussed using optical-laser technology in his satellites, according to a person familiar with the matter. That technology works by beaming information from satellites in space. But lasers wouldn't be a reliable way to deliver Internet service to Earth because, unlike radio waves, they don't easily pass through clouds.

The talks are somewhat unusual for Mr. Musk, who has resisted most outside investments that could reduce even slightly his control over SpaceX. Industry officials said if problems arise, SpaceX might need additional capital in the next few years to fund new rocket development and more launches. It isn't clear what terms are under discussion.

The Wall Street Journal reported Mr. Musk's interest in satellite-Internet service in November, saying he was talking with Mr. Wyler.

Mr. Wyler last week said his new venture, OneWeb Ltd., had secured funding from Richard Branson's Virgin Group and chip company Qualcomm Inc. Mr. Wyler said he hopes to provide Internet service from a constellation of 648 satellites in low-Earth orbit, using a large block of radio spectrum he controls. Mr. Wyler estimated the plan would cost as much as $2 billion.

Messrs. Musk and Wyler stopped working together because of disagreements over control of any joint project, according to a person familiar with their discussions.

Google and Fidelity join existing investors Founders Fund, Draper Fisher Jurvetson, Valor Equity Partners and Capricorn.

Josh Beckerman contributed to this article.

Write to Rolfe Winkler at rolfe.winkler@wsj.com, Evelyn Rusli at evelyn.rusli@wsj.com and Andy Pasztor at andy.pasztor@wsj.com

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