Megameter (Mm)
Definition: A megameter (Mm) is a unit of length equal to one million meters (10^6 meters). It is used to measure large distances in both geography and astronomy.
History: The megameter was introduced alongside other metric units to standardize measurements of large distances. It has been mainly used in astronomical contexts to simplify expressions of distances in space.
Current Use: Megameters are used in astronomy to describe distances between astronomical objects such as the Earth and the Sun. They also appear in some applications in geology and planetary science.
Light Year (ly)
Definition: A light-year (ly) is the distance light travels in one Julian year (365.25 days), approximately 9.461 trillion kilometers or 5.878 trillion miles. It is used for measuring astronomical distances.
History: The term 'light-year' was first introduced in the 19th century to help astronomers express cosmic distances. It replaced astronomical units that were cumbersome for measuring vast space distances.
Current Use: Light-years are used in astronomy to describe distances between stars, galaxies, and other celestial objects. It is crucial for understanding the scale of the universe and cosmic events.
Quick Conversion Table Megameter (Mm) to Light Year (ly)
1 Megameter (Mm) equal to 1.05702341e-10 Light Year (ly)
5 Megameter (Mm) equal to 5.28511706e-10 Light Year (ly)
10 Megameter (Mm) equal to 1.05702341e-9 Light Year (ly)
20 Megameter (Mm) equal to 2.11404682e-9 Light Year (ly)
30 Megameter (Mm) equal to 3.17107023e-9 Light Year (ly)
50 Megameter (Mm) equal to 5.28511706e-9 Light Year (ly)
75 Megameter (Mm) equal to 7.92767558e-9 Light Year (ly)
100 Megameter (Mm) equal to 0.000000011 Light Year (ly)