Solar System

Space debris, also known as space junk, refers to non-functional human-made objects orbiting Earth. These include defunct satellites, spent rocket stages, fragments from past collisions, and even tools lost during…

When we ask how much the Earth “weighs,” we’re really asking about its mass. Weight, in physics, depends on gravity and varies depending on where an object is located. Since…

A planetary alignment, often called a "planet parade," occurs when several planets of the solar system appear to line up in the sky from Earth's point of view. While they…