Is Musk's red car a spaceship btw? Because if we are able to send such stuff to space, other intelligent beings would most probably do the same. Or they are more intelligent?

That's my point! Anything could be in space, elephants, flower pots, EVs. But they picked a particular thing out of the possible universe of objects so was curious why they picked that. It's an asteroid emitting Ni atoms based on the paper. Do we have any evidence of alien spaceships doing that that?