The story
An ellipsis (specifically, an anapodoton) representing the first part of a comparative correlative construction. Popularized by The More You Know (1989–present), an NBCUniversal series of public service announcements that features educational messages. The phrase's association with the emoji 🌠 is inspired by the graphics that accompany the phrase in that series. Collocations such as the more you know, the better [X] long predate the PSA series, but the more you know as an anapodoton seems not to predate it.
Etymology from Wiktionary, CC BY-SA 4.0.