Space appears black because it lacks the matter needed to scatter light, resulting in the absence of color. Unlike the blue sky, which is caused by light scattering through air molecules, space has almost no particles to diffuse light between stars. When observing space, only the direct light from stars is visible, leading to the perception of blackness in the voids. This phenomenon is further explained by Olbers' Paradox, which posits that the universe cannot be both spatially and temporally infinite, as there aren't enough stars to illuminate the entire sky. Therefore, the absence of scattered light in space leads to its black appearance.