* Light-years are a measure of distance: A light-year is the distance light travels in one year. It's used for incredibly vast distances, like those between stars.
* Mercury and Venus are close to the Sun: The planets in our solar system are relatively close to each other compared to the vast distances between stars.
* Astronomical Units (AU) are used: The distance between planets in our solar system is typically measured in Astronomical Units (AU). One AU is the average distance between the Earth and the Sun.
To answer your question more accurately:
* The average distance between Mercury and Venus is around 31 million miles (50 million kilometers).
* This distance can vary depending on where the planets are in their orbits.
* To put this in perspective, this distance is about 0.0003 light-years.
