White hole

White holes were the opposite of black holes. Where black holes attracted and sucked in any nearby matter, white holes did the opposite and pushed nearby matter away. White holes sometimes acted as an exit for matter sucked in by black holes, suggesting some white and black holes were connected through a hyperspace wormhole. It has also been believed that matter and energy escaped from white holes may have actually come from black holes in another universe. Black and white holes may have be connected by a random fluctuation in space and a resulting wormhole. However, once a connection was achieved, a white and black hole were connected for eternity.

Energy emanting from white holes was boundless, and it often came from the very fabric of space itself, along with energies from hyperspace or a connected black hole. The energy escaping could vary, from minescule amounts to titanic quantities. Once released, energy could never return to the hole, and nor could anything else.

Like black holes, white holes had an event horizon, which unlike that of a black hole, was always white, due to the fact that all energy and light was reflected. It is rumoured that, instead of raw gravity, white holes were composed of dark energy, a form of antigravity so strong that even light was hurled away. Nothing could ever reach the event horizon of a white hole.

History
Virtually no white holes were ever known, though they did exist in the galaxy. Titanic amounts of light and heat energy were both released from the hole and reflected from surrounding sources, making white holes incredibly useful as power plants. However, due to their rarity, only one such power plant was ever established. It was built by the Rakata and known as the Star Forge. There was no trace of any hyperspace holes anywhere near the white hole in question, signifying a reliable and constant energy output which never became dangerous. The Rakata claimed the star forge could generate the power of a star. In reality, the power was much greater. The celestial remmnant attempted to create a second star forge, so they could rise up and once again rule the galaxy. Unfortunately, the white hole they attemted to use was connected to a black hole from another galaxy, which swallowed a huge star, causing the white hole to release its energies. This obliterated the celestial remmnant.

Supermassive white holes
Like supermassive black holes, it was rumoured that supermassive white holes existed. When these monsters reached a galaxy, their antigravitational effects could fling the bits of galaxy for thousands of billions of light years across the universe. Similair to regular white holes and black holes, supermassive white and black holes could also be connected through hyperspace.