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| Cosmic distance ladder

Distance

Distance is a numerical description of how far apart objects are. In physics or everyday discussion, distance may refer to a physical length, or an estimation based on other criteria . In mathematics, a distance function or metric is a generalization of the concept of physical distance...

 
| 170.000 ly

Light-year

A light-year, also light year or lightyear is a unit of length, equal to just under 10 trillion kilometres...

LH54-425 is a pair of large, blue stars that lie in the Large Magellanic Cloud

Large Magellanic Cloud

The Large Magellanic Cloud is a nearby irregular galaxy, and is a satellite of the Milky Way. At a distance of slightly less than 50 kiloparsecs , the LMC is the third closest galaxy to the Milky Way, with the Sagittarius Dwarf Spheroidal and Canis Major Dwarf Galaxy lying closer to the center...

. The main star (spectral type O3) is one of the hottest known while the secondary star is a main sequence O6 star. Both are expected to expand into red supergiants and end their lives in Supernova explosions within a few million years.