Why Gayatri Mantra is called ‘Maha Mantra’?

Source: fb.com/sandiegospiritualcenter The Gayatri Mantra is: ॐ भूर्भुवः स्वः तत्सवितुर्वरेण्य भर्गो देवस्य धीमहि धियो यो नः प्रचोदयात॥ In English, Aum Bhur Bhuvah Svah Tat...