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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?
Astronomers are tracking strange orbital patterns in the outer Solar System that suggest a massive unseen planet may exist ...
A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...
Live Science on MSN
'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'
Astronomers have been actively hunting for a ninth planet in the solar system for almost a decade. But a new study has ...
Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its nebular gas had been consumed—Earth's solar system and its planets looked more ...
Material around Chiron, a small icy world in the far reaches of the solar system, may be taking shape into a ring system of ...
What's special about Chiron's rings is that they're still forming; this marks the first time astronomers have ever seen a ...
Isaac Arthur on MSN
How a Newly Found Dwarf Planet Could Rewrite the Solar System
Astronomers have discovered a distant dwarf planet orbiting beyond Neptune — a frozen world so far from the Sun that it ...
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