Tags: Galaxy.
NGC 4555 is a solitary elliptical galaxy about 40000 parsecs (125000 light-years) across and about 310 million light years distant. Observations by the Chandra X-ray Observatory have shown it to be surrounded by a halo of hot gas about 120000 parsecs across. The hot gas has a temperature of around 10000000 kelvins. The galaxy is one of the few elliptical galaxies proven to have significant amounts of dark matter.
