Knowing the Sequence of Oldest to Youngest Planet in Solar System
- Tech Explorist
So, while it makes sense for Jupiter to be the oldest based on formation models, it is not as easy to find the youngest.Â
There’s an alternative approach that we could take and consider the planets' need to have their bulk mass in place as well as having properties consistent with what we see today. Then the context between the youngest becomes a two-horse race between Earth and Uranus.
So, even though Jupiter is considered to be the oldest based on formation models, it is not easy to find the youngest.Â
There are alternative approaches we can take and consider for planets that have large masses and properties consistent with what we see today.Â
Then the context between the youngest becomes a race of two worlds, between Earth and Uranus. The reason why this unusual world emerged as the youngest has to do with the fact that both experienced a major collision.Â
The early Earth likely collided with Theia, a Mars-sized planetoid, and it was from that dramatic event that the Moon formed. It happened about 4.5 billion years ago and it took about 200 million years for Earth's natural satellite to solidify.Â
Whereas the shaken Earth took more time to become what it is today, with the formation of oceans and plate tectonics, the latter of which probably happened 3.6 billion years ago.Â
Between 3 and 4 billion years ago, Uranus collided with an Earth-sized world that messed up its interior, made it spin sideways, and created the strongest magnetic field.Â
So, when it comes to which planet is the youngest, we need to define it precisely to reach a solid conclusion. Not to mention, the definition of a planet can easily become limited and controversial, like the tiny Pluto.
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