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.
Petameter (Pm)
Definition: A petameter (Pm) is a unit of length equal to 10^15 meters, used for measuring large cosmic distances such as the size of galaxies and nebulae.
History: The petameter was introduced to simplify extremely large measurements in astronomy, allowing researchers to express vast distances in a comprehensible unit.
Current Use: Petameters are used in astrophysics when discussing galaxy clusters, intergalactic distances, and space phenomena on an enormous scale.
Quick Conversion Table Megameter (Mm) to Petameter (Pm)
1 Megameter (Mm) equal to 1.0e-9 Petameter (Pm)
5 Megameter (Mm) equal to 5.0e-9 Petameter (Pm)
10 Megameter (Mm) equal to 0.00000001 Petameter (Pm)
20 Megameter (Mm) equal to 0.00000002 Petameter (Pm)
30 Megameter (Mm) equal to 0.00000003 Petameter (Pm)
50 Megameter (Mm) equal to 0.00000005 Petameter (Pm)
75 Megameter (Mm) equal to 0.000000075 Petameter (Pm)
100 Megameter (Mm) equal to 0.0000001 Petameter (Pm)