A Thorne-Żytkow object (TZO) is a hypothetical type of stellar object that is formed when a neutron star enters the core of a red supergiant star, and merges with the core. It is named after the American physicist Kip Thorne and the Polish-American astronomer Anna Żytkow, who proposed its existence in 1977. The TZO is expected to have a very dense core of neutron-degenerate matter, surrounded by a large envelope of normal matter from the red supergiant. It is thought that TZOs may be rare, and that they may be difficult to observe.
NASA Curiosity Rover Photographs
The NASA Curiosity Rover is a car-sized robotic rover that has been exploring the Gale Crater on Mars since it