6000 light years away from Earth and is located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. It is an emission nebula showing glowing ionized hydrogen gas.
7500 light years away from Earth and is located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. It is an emission nebula showing glowing ionized hydrogen gas and darker dust lanes.
The diameter is 4 light years. It surrounds the young massive star HD 37903 of spectral type B2 Ve. The energy of this star illuminates the nebula of molecular hydrogen, which emits near-infrared wavelengths and relatively high surface brightness. New stars are forming in the material from which the NGC 2023 nebula was formed. The gas waves surrounding the star are 5,000 times denser than the interstellar medium. The shock waves stimulate the gas to glow, creating unpredictable forms observed in the nebula.
Lagoon Nebula is a giant interstellar cloud in the constellation Sagittarius. It is classified as an emission nebula and as an H II region. The Lagoon Nebula is estimated to be between 4,000-6,000 light-years away from the Earth.
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