We still don't know for sure if there's a ninth planet in our solar system, but a new discovery could help to prove that ...

A NEW Earth-sized planet has been discovered in a faraway constellation – and it would kill any astronaut who dare travel ...

Analysis of an ancient meteorite suggests that rocky planets both near and distant from the sun may have formed at the same ...

A hidden planet up to 10 times the size of Jupiter was found in the disc around MP Mus, thanks to new data from ALMA and Gaia ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

Astronomers have detected evidence of a third planet orbiting Proxima Centauri, our sun’s nearest stellar neighbor at 25 trillion miles (40.2 trillion kilometers) away.

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory about the possibility of a giant ninth planet. The dwarf planet's existence ...

This illustration shows the orbital motion of six planets discovered orbiting star HD110067 located around 100 light-years from Earth. The planets all are a type called 'sub-Neptunes,' which have ...

Stars often whip their planets with solar winds and radiation, pull them ever closer with gravity and sear them with heat.

Two huge planets found orbiting a star 375 light-years away are the oldest alien worlds yet discovered, scientists say.. With an estimated age of 12.8 billion years, the host star—and thus the ...

This link, called "trapping efficiency," shows how often scattered planets end up in stable wide orbits. The research found that in solar system-like conditions, trapping happens about 5–10% of ...