SpaceX CEO Elon Musk teased a company announcement in the way he appears to be most comfortable: social media.

At 7:10 p.m. Sunday, the billionaire sent the following Tweet to his 7.4 million followers:

“SpaceX announcement tomorrow at 1pm PST”

The six-word Tweet touched off speculation both in the space press and on social media over what the announcement could be.

Is Elon going to update the company’s launch calendar?

An explosion on Sept. 1 in Florida delayed the company’s manifest.

This weekend’s scheduled SpaceX rocket launch will be the first on NASA property in five years.

This weekend’s scheduled SpaceX rocket launch will be the first on NASA property in five years.

Does he finally have a launch date for the Falcon Heavy, the SpaceX rocket expected to be more powerful than any rocket that is lifting off today?

Is he heading to Mars?

Few details have been made available about the announcement beyond Musk’s Tweet.

Emails seeking more information had not been returned as of 11 a.m.

SpaceX on Feb. 19 returned to Florida launches in historic fashion, sending a rocket into space from Launch Complex 39A.

That was the site of the last shuttle mission, which sent astronauts into space from Florida.

The most-recent launch sent 5,500 pounds of cargo to the International Space Station and arrived Feb. 22.

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Carrying several tons of supplies and scientific experiments, the unpiloted SpaceX Dragon cargo craft arrived at the International Space Station Feb. 22 following its launch atop the SpaceX Falcon 9 rocket Feb. 19 from the refurbished Launch Pad 39-A at the Kennedy Space Center.

Carrying several tons of supplies and scientific experiments, the unpiloted SpaceX Dragon cargo craft arrived at the International Space Station Feb. 22 following its launch atop the SpaceX Falcon 9 rocket Feb. 19 from the refurbished Launch Pad 39-A at the Kennedy Space Center.

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