The simulation of the Solar System that came the closest to the observation was the presence of a small planet, between the ...

Scientists have recently proposed the existence of “Planet Y,” a hidden Earth-sized world that could be lurking in our solar ...

CAPE CANAVERAL, Fla. (AP) — For the first time ever, astronomers have discovered seven Earth-size planets orbiting a nearby star — and these new worlds could hold life. This cluster of planets is less ...

(THE CONVERSATION) The Sun will someday die. This will happen when it runs out of hydrogen fuel in its core and can no longer produce energy through nuclear fusion as it does now. The death of the Sun ...

A rocky, Earth-size planet located in our Milky Way galaxy may have an atmosphere around it, according to new research, raising the possibility that it could also have liquid water on its surface and ...

An enormous asteroid is approaching Earth at 24,136 miles per hour—and will be at its closest to us in two days' time. The ...