Scientific Glossary
- Helicase: An enzyme that unzips a DNA double helix into single strands.
- Helioseismology: The study of acoustic waves generated in the Sun's convection zone and transmitted to its photosphere.
- High-harmonic generation: A process that upshifts a femtosecond laser pulse from the visible to the extreme ultraviolet.
- High-temperature superconductor: A material that demonstrates superconductivity (no resistance to the flow of electrons) at temperatures at or above 77 K.
- Hologram: An image recorded in three dimensions that permits the reconstruction of a virtual 3D image.
- Holography: The science of producing holograms.
- Hydrogen wall: Compressed regions of hot hydrogen atoms surrounding some stars.