There are larger moons in the outer solar system ... These include the high angular velocity of the system, as would be expected if Theia delivered an almighty kick, and how close the plane ...

This is the period during which many scientists believe the young Earth collided with another nascent planet called Theia ... line in the outer regions of the young solar system.

The space agency separately launched its twin Voyager spacecraft in 1977 with a mission to explore the outer solar system. The car-size Voyager 1 and Voyager 2 probes exploited a rare alignment of ...

The Earth, like all the other planets in the solar system, started out its life as a disc of dust ... and another protoplanet roughly the size of Mars, sometimes called “Theia.” In this theory, the ...