Leo I

Leo I is a dwarf spheroidal galaxy in the constellation Leo. At about 820,000 light-years distant from Terra, it is a member of the Local Group of galaxies and is thought to be one of the most distant satellites of M-0. It has been suggested that Leo I is a tidal debris stream in the outer halo of M-0. This has not been confirmed. However, it seems to be certain that the galaxy does not rotate.

Leo I's mass was found to be at least (2.0 ± 1.0) × 107 M☉. Typical to a dwarf galaxy, the metallicity of Leo I is very low, only one percent that of Sol. There is no significant evidence of any stars that are more than 10 billion years old. About 1 billion years ago, star formation in Leo I appears to have dropped suddenly to an almost negligible rate. Some low-level activity may have continued until 200-500 million years ago. Therefore it may be the youngest dwarf spheroidal satellite galaxy of M-0. In addition, the galaxy may be embedded in a cloud of ionized gas with a mass similar to that of the whole galaxy.

No known Ancient Gate to or from this galaxy.