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Which planets are the youngest and oldest in our solar system?

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?
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Exoplanet Discoveries Pass the 6,000 Mark, Shedding Light on How Our Solar System Compares With the Rest of the Universe

Just decades after the first exoplanets were identified, our database of the distant worlds—monitored by the NASA Exoplanet Science Institute—has breached a new threshold. Now, astronomers have ...
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'Planet Y' theory hints at hidden Earth-size world lurking in the solar system — and it could be much closer to us than 'Planet Nine'

A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...

This rare green comet won’t return for a thousand years. Here’s how to see it this week.

Comet C/2025 A6 (Lemmon) is this year’s brightest comet visible from Earth—an icy relic from the solar system’s origins that ...