In fact, they come from a future version of the Earth.
Really no reason this couldn't be added in a future version.
And be sure to let us know what you'd like added in future versions.
We will look at adding these in a future version.
This future version of the Doctor is killed by an person in a space suit.
When future versions are released they will be published here.
Perhaps this is something that could also be fixed in a future version of the software.
The possibilities that future versions could bring is very interesting.
Future version may add definition for other types of devices.
But then they say this limitation will be addressed in a future version.