What is the source of this sloka which mentions gravity?
aakrishta-shaktishcha mahi tvayaa yat
kha-stham guru svaabhimukam svashaktyaa/
aakrishyate tat patatiti khe
same samantat kva patatviyam khe//
(Reference : Jnani-Guru, Paramahansa Nigamannanda Sarasvati, Sarasvata Math, page 7).
meaning: The earth has attraction-power and therefore it attracts heavy things from up above. So the things fall on the earth. Otherwise what falls what on void?