Translation guide
A solar sail is a spacecraft propulsion method using radiation pressure from sunlight on large reflective surfaces. This entry covers how to refer to the technology and its components in Japanese.
solar sail (technology/spacecraft)
Referring to the concept of a solar sail as a propulsion system or a spacecraft that uses one.
The most common and direct loanword from English, widely used in scientific and popular contexts.
A solar sail is propelled by the pressure of sunlight.
A native Japanese term literally meaning 'sun sail'. Used in technical and literary contexts, but less common than the loanword.
Solar sail technology is still in the experimental stage.
Literally 'light sail'. A more scientific term emphasizing the use of light pressure. Rarely used outside specialized literature.
The principle of the light sail is based on photon momentum.
Referring to the actual reflective sheet or membrane that catches sunlight.
In most contexts, especially news, popular science, and casual conversation, ソーラーセイル is the safest choice. It is immediately understood and sounds natural.
The sail of the solar sail is made of highly reflective material.