Sedna is a distant celestial body located in the outer region of our solar system, classified as a trans-Neptunian object. It is named after the Inuit goddess of the sea and marine animals. Sedna is notable for its elongated orbit, which takes it far beyond the orbit of Neptune, making it one of the most distant known objects in our solar system. Discovered in 2003, Sedna has a diameter of about 1,000 kilometers (620 miles) and is composed mainly of ice and rock. Its unique orbit and characteristics have led scientists to study it for insights into the formation and evolution of the solar system, particularly regarding the Kuiper Belt and the Oort Cloud.