The place did we come from? How did the planets, asteroids, comets, and small worlds in our photo voltaic system come to be? When did all of it occur? These are among the core questions that drive us to explore other worlds. The beneath timeline reveals some key occasions that led to our existence on Earth, from the creation of the universe to current day. To study extra, learn our Solar System History 101 article.
13.eight billion years in the past: The Massive Bang varieties the universe.
4.6 billion years in the past: A bunch of protostars, one in all which is able to grow to be the Solar, type from a cloud of particles left by prior star explosions within the Milky Approach.
4.59 billion years in the past: The enormous planets Jupiter,
Saturn, Uranus, and Neptune type across the protosun. At the very least Uranus
and Neptune type nearer to the Solar than the place they’re immediately. A number of ice giants could have additionally fashioned that had been later ejected from the photo voltaic system.
4.55 billion years in the past: Let there be gentle: The Solar begins fusing hydrogen into helium.
4.5 to 4.1 billion years in the past: The Solar gravitationally separates from its protostar siblings.
4.1 to three.eight billion years in the past: The enormous planets’
orbits shift, scattering small worlds all through the photo voltaic system. Some
bombard the internal planets and certain ship water and organics to
Four to three billion years in the past: Small world bombardment causes widespread volcanism on the internal planets.
3.eight to three.5 billion years in the past: Life begins on Earth.
Three billion years in the past: Mars loses most of its ambiance and water.
2.5 billion years in the past: Photosynthetic organisms
evolve on Earth and pump oxygen into our ambiance, serving to create the
mix of gases we breathe immediately.
1 billion years in the past: Volcanism on the Moon stops.
100 million years in the past: An impression on the Moon varieties Tycho crater. Saturn will get its rings.
66 million years in the past: An enormous asteroid impacts Earth, triggering international local weather change. Three quarters of life, together with the dinosaurs, go extinct.
Now: The photo voltaic system is a a lot calmer place now, although occasional asteroid impacts still threaten Earth.