Two Japanese scientists and a Japanese-born American have won the Nobel Prize in physics for inventing blue light-emitting diodes.

Isamu Akasaki and Hiroshi Amano of Japan and US scientist Shuji Nakamura have won the Nobel Prize in physics for the invention of blue light-emitting diodes - a new energy efficient and environment-friendly light source.

Discoveries of planets orbiting stars outside the solar system, efforts to better understand the weather and work on carbon tubes are among the discoveries that could win the Nobel Prize in physics today.