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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 than the hypothetical Planet X, which astronomers have been hunting for almost a decade. However, the evidence for this newly theorized world is "not definitive."
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?
Soar through a 1,000-mile-long maze on Mars in this mesmerizing new satellite video
A stunning new video, made from Mars Express orbiter data, allows you to soar over a gigantic maze on the Red Planet in incredible detail.
Scientists find best evidence yet that icy moon Enceladus is habitable
An ocean flowing beneath the surface of Saturn's moon Enceladus is spewing ice that holds the building blocks of life.
It's official: Humans have found 6,000 planets beyond our solar system
Just two decades after astronomers discovered the first exoplanet, NASA has confirmed the existence of 6,000 alien worlds. The total will rise even quicker as next-generation telescopes take flight.
'If there is a space race, China's already winning it': NASA unlikely to bring Mars samples back to Earth before China does, experts say
"If there is a space race, China's already winning it, and could win it dramatically in the next few decades."
Why does Pluto have such a weird orbit?
The dwarf planet has a strange orbit and tilt — what gives?
Saturn will be at its biggest and brightest on Sept. 21 — here's how to see it
In a once-a-year event, Saturn is about to reach opposition, with the ringed planet appearing its best and brightest as it approaches its closest point to Earth.
