when was the one who discovered it born?
15 March 1713
Nicolas-Louis de Lacaille
Abbé Nicolas-Louis de Lacaille, formerly sometimes spelled de la Caille, (; 15 March 1713 – 21 March 1762) 
where could be found hii emission nebula regions Sometimes several hundred light-years across, are often associated with giant molecular clouds what does this region mean? It is a region of interstellar atomic hydrogen that is ionized how did it get the name? The term H II is pronounced "H two" by astronomers. "H" is the chemical symbol for hydrogen, and "II" is the Roman numeral for 2. what are it's features? It vary greatly in their physical properties, their size is also known as the Stromgren radius and essentially depends on the intensity of the source of ionising photons and the density of the region, their densities range from over a million particles per cm³ in the ultra-compact H II regions to only a few particles per cm³ in the largest and most extended regions how is it distributed? The reason H II regions rarely appear in elliptical galaxies is that ellipticals are believed to form through galaxy mergers. In galaxy clusters, such mergers are frequent. does it face any problems? UNANSWERABLE which are the special regions it has? Orion Nebula, the Eta Carinae Nebula, and the Berkeley 59 / Cepheus OB4 Complex what is the second one about? It is also known as the Grand Nebula in Carina,  is a large complex area of bright and dark nebulosity in the constellation Carina who discovered it? Nicolas-Louis de Lacaille how is it classified? Eta Carinae A is classified as a luminous blue variable (LBV) due to the distinctive spectral and brightness variations. how big is it? The size of the two main stars in the Eta Carinae system is difficult to determine precisely because neither star can be seen directly has it witnessed any eruption? Yes, two eruptions have been observed from Eta Carinae how does it's surroundings look like? The nebula is a prominent naked eye object in the southern skies showing a complex mix of emission, reflection, and dark nebulosity does it have any effect on earth? No, but if a gamma-ray burst in any case Earth's atmosphere protects its inhabitants from all the radiation apart from UV light, the main effect would result from damage to the ozone layer is it visible from earth? Yes, Eta Carinae is comfortably visible to the naked eye in all but the most light-polluted skies in inner city areas according to the Bortle scale
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Nicolas-Louis de Lacaille [SEP] Introduction
Abbé Nicolas-Louis de Lacaille, formerly sometimes spelled de la Caille, (; 15 March 1713 – 21 March 1762) was a French astronomer and geodesist who named 14 out of the 88 constellations. From 1750 to 1754 he studied the sky at the Cape of Good Hope in present-day South Africa. Lacaille observed over 10,000 stars using just a half-inch refractor.