Edmund got a very good education and was very smart. He got into college when he was 17. He attended Queen's College Oxford. He already knew a lot about astronomy. He owned a lot of astronomy tools, which his father had bought for him.
Even though Edmund did a lot of great things in his life, he is best known for figuring something out about some comets.
People had seen comets in the years 1456, 1531, 1607, and 1682. After studying records about these comets, Edmund Halley figured out that they were all the same comet, which traveled far away and came back again every 75 or 76 years. Some people did not believe him when he said that this comet would come back in 1758.
Edmund died on January 14, 1742 in Greenwich, England, which is also near London. He did not get to see the comet come back in 1758, like he said it would. He also did not know that people named the comet after him.