Coming from a planet that launches a lot of alien spaceships, is it that implausible that it could be (or could have been) an alien spaceship?
I totally agree that there is a good chance that it wasn't alien, and we want to identify what it could be if it wasn't, but why dismiss it? Most scientist already believe we are not alone, even though it is unlikely we are close to any other intelligent life. The chance that it was alien should be explored as well, and I know their are scientist who believe it is alien.