| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Hawaiian language | No definition provided | Christopher Rauch | 2023.12.01 |
| Hawaiian poetry | No definition provided | Christopher Rauch | 2023.12.01 |
| Hawaiian songs | No definition provided | Christopher Rauch | 2023.12.01 |
| Hawkers and hawking | No definition provided | Christopher Rauch | 2023.12.01 |
| Hawking | No definition provided | Christopher Rauch | 2023.12.01 |
| Hawking radiation | The radiation produced by a black hole when quantum mechanical effects are taken into account. According to quantum physics, large fluctuations in the vacuum energy occurs for brief moments of time. T hereby virtual particle-antiparticle pairs are created from vacuum and annihilated. If pair production happens just outside the event horizon of a black hole, as soon as these particles are formed they would both experience drastically different gravitational attractions due to the sharp gradient of force close to the black hole. One particle will accelerate toward the black hole and its partner will escape into space. The black hole used some of its gravitational energy to produce these two particles, so it loses some of its mass if a particle escapes. This gradual loss of mass over time means the black hole eventually evaporates out of existence. | Ryan McGranaghan | 2023.04.16 |
| Hawks | No definition provided | Christopher Rauch | 2023.12.01 |
| Hawleyite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hawthorn | No definition provided | Christopher Rauch | 2023.12.01 |
| Hawthorneite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Haxonite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| haxrayclass | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hay | No definition provided | Christopher Rauch | 2023.12.01 |
| Hayashi track | The path on the Hertzsprung-Russell diagram that is followed by a fully convective pre-main sequence star to reach the zero-age main sequence. Hayashi tracks for low-mass stars are near vertical. At h igher masses, stars become increasingly radiative as they contract and the Hayashi tracks are almost horizontal. | Ryan McGranaghan | 2023.04.16 |
| Hay-boxes | No definition provided | Christopher Rauch | 2023.12.01 |
| Haycockite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Haydeeite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hay-fever | No definition provided | Christopher Rauch | 2023.12.01 |
| Hay-fever--Homeopathic treatment | No definition provided | Christopher Rauch | 2023.12.01 |
| Haynesite | No definition provided | Ryan McGranaghan | 2023.04.16 |