Why do people ask this? Because space is big. We hear “light year” and think it’s a generic unit for “far away.” But it’s super specific.
If you tried to use light years for Mars, you’d get a number like 0.0000057 light years at its closest. That’s a decimal so small it looks like a typo.
Saying “Mars is 0.0000057 light years away” is technically correct but utterly useless. It’s like saying your coffee cup is 0.0000001 miles away.
Units of Measurement - Earth in the Solar System Final
A Quirky Thought Experiment
Let’s mess with your brain. Imagine you could drive a car to Mars at 60 mph. It would take centuries. Now imagine a light beam doing the same trip.
That light beam takes just 3 minutes at closest approach. Light is absurdly fast. But even light needs time to cross our solar system.
The nearest star, Proxima Centauri, is 4.24 light years away. That’s a real light year distance. Mars isn’t even in the same ballpark.
