In astronomy, an occultation is when a celestial body or object — like the moon or a planet — passes in front of a distant ...

What is “down” in the vastness of space? Scientists reveal how gravity, cosmic planes, and perspective redefine direction, ...

From the deck of a ship or the window of a plane, it feels obvious that “down” points toward Earth and “up” points toward the ...

When my colleagues and I send them out to explore our solar system, it's important for us to understand the 3D map of our ...

Earth and its neighbors orbit the sun on a relatively flat plane. But what's below this plane, and is anythign below the ...

In the bigger picture, “down” could be defined as being below the plane of the solar system, which is known as the ecliptic.

Planet 9 sits at the edge of scientific imagination, promising either an epic expansion of the Solar System or a lesson in ...