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- A measure of the expansion rate and age of the universe. It appears to be between 60 and 80 kilometers per second per megaparsec. (A megaparsec is equal to 3.26 x 106 light-years.)
- Browse Related Terms: Dynamics, Finite, H0, Hubble Constant, Initial Conditions, Intensity, Light Year, Nought, static, Visible Universe
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Any mass or object in space, including nebulas, planets, moons, stars, pulsars, quasars and so on.
- Browse Related Terms: Angular Size, Apparent luminosities, Constant of Proportionality, Dark Matter, Flux, Heavenly Bodies, Intrinsic Luminosity, Inverse Square, Luminosity, Main Sequence Star, Observed Brightness, Parallax, Parsec, Relative Brightness, Standard Candle, Type Ia Supernova, Variable Stars
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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 the center of the universe.
- Browse Related Terms: Background Radiation, Closed Universe, COSMIC, Cosmic Microwave Backgroun (CMB), Cosmology, Flat Universe, Flatness Problem, Geocentric, Geometries, Heliocentric, Metastable Energy Density, Omega, Ω, Opaque to Radiation, Open Universe , Ω, Planck Time, Universe, Vacuum Energy
A huge magnetic bubble containing the solar wind and the entire solar magnetic field. At the outermost boundary of the heliosphere, our solar wind meets the interstellar medium, a plasma that permeates our Milky Way galaxy. Scientists estimate that this boundary is between 9 and 15 billion kilometers away from the Sun, far beyond the orbits of all the planets. We should find out for certain sometime in this century when one or more spacecraft - Voyagers 1 and 2 and Pioneers 10 and 11 - leave the heliosphere and enter interstellar space.
- Browse Related Terms: AURORA, Auroral Oval, Coronal Mass Ejection (CME), Geosynchronous, Heliosphere, Magnetic Field, Magnetic Field Lines, Magnetic Storms and Substorms, Magnetosphere, Magnetotail, Radiation Belt, Solar System, Solar Wind, Space Weather
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This is a particular kind of transistor that is especially appropriate for use in microwave amplifiers.
- Browse Related Terms: Accelerating Universe, anomaly, Baryonic Matter, High Electron Mobility Transistor (HEMT), Homogeneous, Visible Mass
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Looking the same at every location. Homogeneous milk has no lumps or impurities; it remains the same no matter where you look. The same goes for a homogenous universe, which has the same number of galaxies per square unit of distance.
- Browse Related Terms: Accelerating Universe, anomaly, Baryonic Matter, High Electron Mobility Transistor (HEMT), Homogeneous, Visible Mass
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The redshift in light coming from distant galaxies is proportional to their distance from earth.
The law was first formulated by Edwin Hubble in 1929 after nearly a decade of observations. It is considered the first observational basis for the Big Bang. Exerpt from Wikipedia. Information held under GNU Free Documentation License.
- Browse Related Terms: Aberration, Big Bang, Cosmological Principle, Curvature of Spacetime, General Relativity, Hubble's Law, Milky Way, Quasar, Recede, Relativity, Spacetime, Supernova
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An educated guess.
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