Blu-ray Disc (BD) is an optical disc storage medium designed to supersede the DVD format. The plastic disc is 120 mm in diameter and 1.2 mm thick, the same size as DVDs and CDs. Blu-ray Discs contain 25 GB per layer, with dual layer discs (50 GB) being the industry standard for feature-length video discs. Triple layer discs (100 GB) and quadruple layers (128 GB) are available for BD-XL re-writer drives.

The major application of Blu-ray Discs is as a medium for video material such as feature films. Besides the hardware specifications, Blu-ray Disc is associated with a set of multimedia formats. Generally these formats allow for the video and audio to be stored with greater definition than on DVD.

The first Blu-ray Disc prototypes were unveiled in October 2000, and the first prototype player was released in April 2003 in Japan. Afterwards, it continued to be developed until its official release in June 2006.

The name Blu-ray Disc refers to the blue laser used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs.

Chris Hemsworth (born 11 August 1983) is an Australian actor best known for portraying Thor in the Marvel Studios films Thor (2011) and The Avengers (2012), and Curt Vaughan in The Cabin in the Woods (2012). Hemsworth is set to continue his role as Thor in the upcoming film Thor 2 in 2013. He also starred as Kim Hyde in the Australian soap opera Home and Away. He is the older brother of Liam Hemsworth and the younger brother of Luke Hemsworth, both actors.

Hemsworth was born in Melbourne, the son of Leonie, an English teacher, and Craig Hemsworth, a social-services counselor. He was raised both there and in the Northern Territory, in a little Aboriginal community in the Outback, called Bulman. He has stated, "My earliest memories were on the cattle stations up in the Outback, and then we moved back to Melbourne and then back out there and then back again. Certainly most of my childhood was in Melbourne but probably my most vivid memories were up there in Bulman with crocodiles and buffalo. Very different walks of life." He attended primary school at Southwood Primary school and high school at Heathmont College, before his family again returned to the Northern Territory, and then moved a few years later, to Phillip Island.