lithium
Chemical element whose atomic nucleus contains three protons. In the context of general relativity, it is of interest as one of the light elements that formed in the early universe during Big Bang ...
LISA
The concept of LISA (Laser Interferometer Space Antenna), a space-based gravitational wave detector, has been studied jointly by the European and US space agencies ESA and NASA for 20 years. The planned interferometric gravitational wave detector should be ...
liquid
State of matter in which the constituent atoms and molecules are bound to each other, but so loosely that the matter cannot maintain any shape without external support: If you place a liquid into a container, its shape will adapt to that of the container (in ...
line
Geometric object with a single dimension. A line can either be an independent one-dimensional space (in the abstract mathematical space where a space does not need to have three dimensions), or it can be embedded into a more general space, like a line drawn ...
LIGO
Laser Interferometer Gravitational-Wave Observatory : A detector project for the measurement of gravitational waves in the United States, which was upgraded to the Advanced LIGO between 2010 and 2015 .The detector includes two interferometric gravitational ...
light
Light in the strict sense of the word is electromagnetic radiation the human eye can detect, with wave-lengths between 400 and 700 nanometres. In relativity theory and in astronomy, the word is often used in a more general sense, encompassing all kinds of ...
light-wave
Light is a mixture of elementary waves, each a regular succession of maxima and minima of the electromagnetic field. The same is true for all other sorts of electromagnetic ...
