In space below Earth, there is no specific object or entity directly beneath our planet. Space is a vast expanse that extends in all directions, including below and above Earth. When we refer to "below" or "above" Earth in space, it is merely a conceptual way to describe directions based on our frame of reference.
Below Earth, as we commonly understand it, would refer to the direction opposite to the surface of the planet. In this direction, there is empty space, with no celestial body occupying that specific location. However, space is not completely empty. It contains various elements, including interstellar gas, dust, and other celestial objects like asteroids, comets, and distant stars.
If we consider the larger context of the solar system, "below" Earth would be in the direction toward the Sun. In this case, space is occupied by the Sun itself, along with the planets, asteroids, and other objects that orbit the Sun.
Ultimately, it's important to note that space is vast and mostly empty, with objects scattered throughout at vast distances from each other. So, below Earth, in the context of space, primarily refers to the direction opposite to our planet's surface, leading into the depths of the universe.