How old is Neptune? Neptune was formed at the same time as the rest of the solar system, from a large spinning disk of gas and dust. Astronomers think that all this happened about 4.6 billion years ago! So Neptune is about 4.6 billion years old.
Neptune was formed at the same time as the rest of the solar system, from a large spinning disk of gas and dust. Astronomers think that all this happened about 4.6 billion years ago! So Neptune is about 4.6 billion years old.
