Â鶹Éç

Elon Musk is trolling Jeff Bezos on Twitter.

Elon Musk tweeted on Tuesday night about with the intention of bringing 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.

Now Amazon plans to launch a massive constellation of more than 3,000 internet satellites

— MIT Technology Review (@techreview)

Musk’s privately owned space exploration company SpaceX has been working on a similar project. SpaceX’s Starlink division got approval from the FCC in November to , with the same goal of providing global high-speed internet. It launched .

This week that Amazon had hired a former Starlink exec to head up Project Kuiper. SpaceX’s former VP of satellites Rajeev Badyal is joining the Amazon mission after he was after he grew frustrated with the project’s slow pace.

This isn’t the first time that 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 then-new New Shepard rocket 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.

Not quite “rarest”. SpaceX Grasshopper rocket did 6 suborbital flights 3 years ago & is still around.

— Elon Musk (@elonmusk)

Jeff maybe unaware SpaceX suborbital VTOL flight began 2013. Orbital water landing 2014. Orbital land landing next.

— Elon Musk (@elonmusk)

The pair have 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.

Best of luck with the Falcon Heavy launch tomorrow – hoping for a beautiful, nominal flight!

— Jeff Bezos (@JeffBezos)