Earth will be hosting a "mini-moon" starting this weekend. Also sometimes called a "second moon," the small asteroid will ...

An asteroid called 2020 CD3 was bound to Earth for several years before leaving the planet’s orbit in 2020 and another called 2022 NX1 became a mini-moon of Earth in 1981 and 2022 and will return ...

Pollard A quartet of Earth-like worlds, each about 20% to 30% the size of our planet, circle one of our ... with a mass around one-sixth that of the sun. At 5.97 light-years from Earth, it is ...