The private space company has reported this week that it's plucky test pilot has now passed Mars - which is 54.6 million kilometers (33.9 million miles) away.
On Feb. 14, we watched Starman disappear into deep space, after being carried carried into orbit by SpaceX's Falcon Heavy rocket, which launched its maiden flight and landed two of its three main boosters back on Earth - we were there.
Musk tweeted Saturday that he walked the length of the tunnel and commented that it is "disturbingly long".
The extra publicity for his other company, Tesla, didn't hurt either.
The auto will now continue its orbit, looping back toward us, where it is expected to cross Earth's orbit in August 2019.
The research team behind the study estimate that the Roadster will slam into either Earth or Venus in the next few tens of millions of years.
Until then, Starman is going to continue its road trip through the galaxy with David Bowie's 1969 hit "Space Oddity" blaring out into the noiseless vacuum of space.