Elon Musk tweeted at Jeff Bezos on Tuesday, calling him a "copycat."

The tweet was in response to a story indicating that Amazon planned to launch thousands of satellites that would deliver high-speed internet to remote parts of the world.

Musk's company SpaceX is working on a similar project.

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Elon Musk is trolling Jeff Bezos on Twitter.

Musk tweeted on Tuesday night about Amazon's plans to launch 3,236 satellites into orbit with the intention of delivering high-speed internet to the globe's more remote regions. The plan is codenamed "Project Kuiper."

Musk tweeted under MIT Tech Report's story about Project Kuiper, tagging Amazon CEO Jeff Bezos and writing "copy" followed by the cat emoji.

Musk's privately owned space-exploration company, SpaceX, has been working on a similar project. SpaceX's Starlink division got approval from the Federal Communications Commission in November to launch a planned 11,943 satellites, with the same goal of providing global high-speed internet. It launched two experimental Starlink satellites in February.

This week CNBC reported that Amazon had hired a former Starlink exec to head up Project Kuiper. Rajeev Badyal, SpaceX's former vice president of satellites, is joining the Amazon mission. Musk reportedly fired Badyal in June after growing frustrated with the project's slow pace.

Read more: Amazon hired a former SpaceX exec to launch its satellite constellation plan after he was fired by Elon Musk

This isn't the first time Musk has squared up to Bezos on Twitter. In 2015, Bezos tweeted proudly about a rocket launch from his privately owned space-exploration company, Blue Origin.

Specifically, he was pleased because the company's New Shepard rocket had successfully launched then landed again, tweeting: "The rarest of beasts — a used rocket."

Musk quickly chimed in. "Not quite 'rarest.' SpaceX Grasshopper rocket did 6 suborbital flights 3 years ago & is still around," he said.

The two have also exchanged pleasantries before. Bezos wished SpaceX the "best of luck" with the Falcon Heavy launch in February last year. Musk thanked him with a kissing emoji, before Bezos responded with "woohoo" and three rocket emojis.