There's one at least. But you have to click on the toggle visibility button at the bottom of screen, then switch on spacecrafts. Then it will show you at least one - the Tesla Roadster launched in 2018.
Nice find. That's the only one up there currently, mostly because it's in a simple heliocentric orbit (most spacecraft are not). I want to add more but need to figure out how to properly find their current position+velocity to start the physical simulation.
There aren't any - it's just natural stellar bodies.