Distance from Earth, in the context of planets, refers to the measure of the physical separation between Earth and a specific planet in our solar system. It is a fundamental parameter used to describe the position and location of planets relative to our planet.

The distance from Earth to a planet can vary greatly depending on several factors, including the planet's position in its orbit around the Sun and Earth's position in its own orbit. Since the planets and Earth all orbit the Sun, their distances from each other are constantly changing.

To measure the distance from Earth to a planet, astronomers use units such as astronomical units (AU) or kilometers (km). An astronomical unit is defined as the average distance between the Earth and the Sun, which is approximately 149.6 million kilometers (93 million miles).

The distance from Earth to each planet in our solar system varies significantly. For example, the average distance from Earth to Venus is about 41 million kilometers (25 million miles), while the average distance to Mars is approximately 78 million kilometers (48 million miles). The outer planets, such as Jupiter, Saturn, Uranus, and Neptune, are much farther from Earth, with average distances ranging from hundreds of millions to billions of kilometers.

The distance from Earth to a planet affects our ability to observe and study it. Telescopes and spacecraft are used to gather data and images from these distant worlds, providing valuable information about their atmospheres, surfaces, and geology.