What do you think about the scene in Doctor Who 'Journey's End' where the Tardis tows the Earth?

I have recently watched the episode of Journey's end and was disappointed at how the Daleks were defeated but i digress. But what really got me was the Tardis 'towing' the Earth back, now i can believe and understand teleportation of entire planets as its feasible but towing an entire planet whose m is huge without even a rope (sarcasm).Its madness. Whats your opinion. Please show links to where the towing of the Earth is discussed.