How many light years away is Mars from Earth?

Mars is not measured in light years from Earth; it is measured in astronomical units (AU) or in kilometers. An astronomical unit is the average distance between the Earth and the Sun, which is approximately 93 million miles (150 million kilometers) or 1 AU.

The distance between Mars and Earth varies because both planets have elliptical orbits around the Sun. On average, Mars is about 1.52 astronomical units away from Earth, which is roughly 140 million miles (225 million kilometers). However, this distance can vary from about 0.38 AU (closest approach or opposition) to about 2.68 AU (farthest distance) due to their differing orbits.

To express this distance in light years, you would need to convert it. One light year is approximately 5.88 trillion miles (9.46 trillion kilometers). So, on average, Mars is about 0.000015 light years away from Earth (140 million miles / 5.88 trillion miles), but this distance changes as both planets orbit the Sun.