Since Pluto was relegated to dwarf planet status, almost everyone has agreed that there are eight planets in our solar system ...
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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 ...
There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?
Planets that orbit white dwarf stars should be too hot to host alien life, theories suggest. But a new study accounting for ...
A rare interstellar visitor has entered our Solar System, and it’s behaving in ways that have astronomers both fascinated and ...
"Both hemispheres are darkening," the team explained. "The Northern Hemisphere is darkening at a faster rate." ...
The Copernican Principle, named in honor of Nicolaus Copernicus (who proposed the heliocentric model of the Universe), states ...
Space scientists look back on three decades of exoplanet discoveries—from rows of massive ‘super-Earths‘ to worlds with ...
Interstellar comet 3I/ATLAS — just the third such object ever confirmed to have entered our solar system — flew past Mars ...
We all need some space sometimes—but it's harder to find than you might think. How far into our universe do we have to go to ...
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