Why does Select-Object return more than requested?

Why does the following command return more attributes than in the Select?

$obj = Get-VM | Select VMName,State; $obj

VMName         : blah-blah
State          : Off
PSComputerName : host
RunspaceId     : URI

And how do I just get the value for State?

$obj = Get-VM | Select VMName,State; $obj.State