Everything

"Enoch, Abraham, and Moses all had revelations on astronomy, and Joseph Smith called the first newspaper of the LDS Church The Evening and the Morning Star. Abraham gazed into the Urim and Thummim and was swept away in a vision of the heavens. Beyond the violent hurricanes of Jupiter and the twisted rings of Saturn, past swirling black holes and the blinding explosions of living stars he traveled until he approached the throne of God. Then, "face to face, as one man talketh with another," he spoke with the Lord, and like Enoch before him and Moses after him, he was shown "those things which [God's] hands had made, which were many; and they multiplied before mine eyes, and I could not see the end thereof" (Abraham 3: 4-15). Abraham was taught astronomy from the Being who organized it all, "the times and seasons in the revolutions thereof"of stars and planets, the earth and the sun."
http://www.johnpratt.com/items/docs/lds/meridian/2000/mormastr2.html