Short answers, pulled from the story.
Earth formed around 4.54 billion years ago, roughly one-third the age of the universe, by accretion from the solar nebula. It was largely complete within 10 to 20 million years, though in June 2023 scientists reported evidence it may have formed in just three million years.
The widely accepted giant impact hypothesis holds that a body the size of Mars, sometimes named Theia, struck the proto-Earth a glancing blow. Mantle material flung into orbit condensed into the Moon, which is dated to about 4.53 billion years old.
The earliest undisputed evidence of life dates from at least 3.5 billion years ago, during the Eoarchean Era. Microbial mat fossils called stromatolites have been found in 3.48 billion-year-old sandstone in Western Australia, and the last universal ancestor lived perhaps 3.5 billion years ago or earlier.
The history of Earth is divided into the Hadean, from 4,540 to 4,000 million years ago, the Archean, from 4,000 to 2,500 million years ago, the Proterozoic, from 2,500 to 538.8 million years ago, and the Phanerozoic, which began about 538.8 million years ago and continues today.
The Cambrian Explosion was a sudden acceleration of evolution about 538.8 million years ago that produced most of the major phyla known today. It was an adaptive radiation that filled niches left empty by the extinct Ediacaran biota, and it divided the Proterozoic Eon from the Cambrian Period.
In 66 million years ago, a 10 kilometer asteroid struck just off the Yucatan Peninsula, where the Chicxulub crater lies today. The impact ejected dust and vapor that blocked sunlight and halted photosynthesis, ending 75 percent of all life, including the non-avian dinosaurs.
A small African ape living around 6 million years ago was the last common ancestor of humans and chimpanzees. The first members of the genus Homo appeared by 2 million years ago, and modern Homo sapiens originated around 200,000 years ago or earlier in Africa.