Astronomy terms starting with H

8 terms

  1. H<sub>0</sub>, Hubble Constant A measure of the expansion rate and age of the universe. It appears to be between 60 and 80 kilometers per second per megaparsec.
  2. Heavenly Bodies Any mass or object in space, including nebulas, planets, moons, stars, pulsars, quasars and so on.
  3. Heliocentric A model of the universe published by Nicolaus Copernicus, and proven by Galileo (who viewed the phases of venus with his telescope), which puts our sun at…
  4. Heliosphere A huge magnetic bubble containing the solar wind and the entire solar magnetic field.
  5. High Electron Mobility Transistor (HEMT) This is a particular kind of transistor that is especially appropriate for use in microwave amplifiers.
  6. Homogeneous Looking the same at every location. Homogeneous milk has no lumps or impurities; it remains the same no matter where you look.
  7. Hubble's Law The redshift in light coming from distant galaxies is proportional to their distance from earth.
  8. Hypothesis A tentative proposal made to explain certain observations or facts that requires further investigation to be verified.