OU4 and Sh2-129 are two astronomical objects located in the constellation Cepheus. OU4 is a bipolar outflow nebula, while Sh2-129 is a larger emission nebula that surrounds OU4. The two objects are often referred to as the "Squid Nebula" and the "Flying Bat Nebula" respectively, due to their distinctive shapes.OU4 was discovered in 2011 by Nicolas Outters, a French amateur astronomer. It is a very faint object, and can only be seen with large telescopes and long exposure times. The nebula is thought to be powered by a triple star system located in its center. The stars are emitting a strong outflow of gas and dust, which is carving out the distinctive shape of the nebula.Sh2-129 is a larger and more diffuse nebula. It is also an emission nebula, meaning that it is made up of ionized gas. The gas is excited by the radiation from nearby stars, and it glows in a variety of colors, including red, green, and blue. Sh2-129 is thought to be about 1,500 light-years away from Earth.The Squid Nebula and the Flying Bat Nebula are a fascinating example of the dynamic and evolving nature of the universe. They are a reminder that even the most distant objects in the sky are constantly changing and evolving.Here are some additional details about OU4 and Sh2-129:
- OU4 is located about 2,000 light-years from Earth.
- Sh2-129 is located about 1,500 light-years from Earth.
- The size of OU4 is about 1 light-year across.
- The size of Sh2-129 is about 5 light-years across.
- The temperature of OU4 is about 10,000 degrees Kelvin.
- The temperature of Sh2-129 is about 8,000 degrees Kelvin.
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