Earth, sun, moon: three objects in space whose interactions have a pretty big impact on our lives. Earth orbits the sun once ...

Earth grew to its final size through one last major collision with another Mars-sized object. This last collision, also known as the “moon-forming impact,” was so large that—in addition to adding lots ...

In an extraordinary celestial event, Earth has been hosting a “mini-moon” the size of a city bus for the past several ... a ...