The nature of the entry of Indo-Aryan speakers into India has been discussed in more nuanced ways, but the relation of Sanskrit et al. to European languages (an

The nature of the entry of Indo-Aryan speakers into India has been discussed in more nuanced ways, but the relation of Sanskrit et al. to European languages (and the unrelatedness of Indo-Aryan to Dravidian and Munda and so) is all well established and not under debate. Either Indo-Aryan speakers migrated into India from outside, or all of the other Indo-European groups migrated out of India. The latter, while not completely out of the question, is much less likely than the former.