a. Supernova: star increasing suddenly in brightness.
b. Radioactivity: spontaneous disintegration of atomic nuclei, with the emission of usu. penetrating radiation or particles.
c. Laser: device that generates an intense beam of coherent light, or other electromagnetic radiation, in one direction. (Light Amplification by Stimulated Emission of Radiation)
d. Semiconductors: substance that in certain conditions has electrical conductivity intermediate between insulators and metals.
e. Geothermal Energy: Geothermal power is power extracted from heat stored in the earth. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface.
f. Computer Virus: self-replicating code maliciously introduced into a computer program and intended to corrupt the system or destroy data.
g. Pasteurization: