Rho Ophiuchi nebulae complex. This region of nebulae (clouds of dust and gas) surrounds a group of bright stars that are around 500 light years from Earth in the constellation of Ophiuchus. Nebulae are clouds of gas and dust in space, many light years across. They are called emission nebulae when the hydrogen gas is ionised by nearby stars and emits light. Reflection nebulae reflect and scatter light. Nebulae contain the materials to form new stars and planets.
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