Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. S Ori 70 or S Ori J053810.1-023626 is a mid-T type astronomical object towards the direction of the Sigma Ori cluster which is approximately 1,150 light-years away from Earth. It was discovered on November 24, 2002 by M. R. Zapatero Osorio and E. L. Martin's team at the Roque de los Muchachos Observatory. It is still being observed if it is a field brown dwarf or a 3-million-year-old planet which is part of a cluster. Near-infrared spectroscopy images taken 3 years after its discovery led to the first motion measurements for the object. Its behavior is significantly different than solar, further described as either a low-gravity atmosphere to an atmosphere with metallicity. The object’s small proper motion suggests that it is farther away than expected if it were a single field T dwarf.