All > Science > Astronomy > Astrophysics

• Filling all space, e.g. the radiation from the early, hot universe.

  Lawrence Berkeley National Laboratory's Physics Division - Cite This Source - This Definition
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  Cite Definition for Background Radiation

  American Psychological Association (APA)

  Background Radiation. (n.d.). The Universe Adventure Glossary. Retrieved June 10, 2023, from website: http://www.expertglossary.com/definition/background-radiation.

  Chicago Manual of Style (CMS)

  Background Radiation. pdgusers.lbl.gov. The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. http://www.expertglossary.com/definition/background-radiation (accessed: June 10, 2023).

  Modern Language Association (MLA)

  "Background Radiation." The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. 10 June. 2023 http://www.expertglossary.com/definition/background-radiation.

• 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

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All > Science > Astronomy > Astrophysics

• Subatomic particles comprised of three quarks. Protons (comprised of two up quarks and one down quark) and neutrons (made up of two down quarks and one up quark) are examples of baryons.

  Lawrence Berkeley National Laboratory's Physics Division - Cite This Source - This Definition
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  Cite Definition for Baryon

  American Psychological Association (APA)

  Baryon. (n.d.). The Universe Adventure Glossary. Retrieved June 10, 2023, from website: http://www.expertglossary.com/definition/baryon.

  Chicago Manual of Style (CMS)

  Baryon. pdgusers.lbl.gov. The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. http://www.expertglossary.com/definition/baryon (accessed: June 10, 2023).

  Modern Language Association (MLA)

  "Baryon." The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. 10 June. 2023 http://www.expertglossary.com/definition/baryon.

• Browse Related Terms: Atoms, Baryon, deuterium, Extrapolate, Fission, Isotopes, Neutron, Nucleon, Nucleus/Nuclei, Primordial Nucleosynthesis, Synthesis of Nuclei

All > Science > Astronomy > Astrophysics

• Ordinary matter, which is made up largely of baryons.

  Lawrence Berkeley National Laboratory's Physics Division - Cite This Source - This Definition
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  Cite Definition for Baryonic Matter

  American Psychological Association (APA)

  Baryonic Matter. (n.d.). The Universe Adventure Glossary. Retrieved June 10, 2023, from website: http://www.expertglossary.com/definition/baryonic-matter.

  Chicago Manual of Style (CMS)

  Baryonic Matter. pdgusers.lbl.gov. The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. http://www.expertglossary.com/definition/baryonic-matter (accessed: June 10, 2023).

  Modern Language Association (MLA)

  "Baryonic Matter." The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. 10 June. 2023 http://www.expertglossary.com/definition/baryonic-matter.

• Browse Related Terms: Accelerating Universe, anomaly, Baryonic Matter, High Electron Mobility Transistor (HEMT), Homogeneous, Visible Mass

All > Science > Astronomy > Astrophysics

• The scientific theory of the origin of the universe as an explosion of space and matter, starting from an enormously dense and hot state at some finite time in the past. (At this point the estimate is 14 billion years ago). The central idea is that the observed redshift of the galaxies (Hubble's law) shows that the galaxies are receding from each other, which implies that they were much closer together in the past. - Exerpt from Wikipedia. Information held under GNU Free Documentation License.

  Lawrence Berkeley National Laboratory's Physics Division - Cite This Source - This Definition
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  Cite Definition for Big Bang

  American Psychological Association (APA)

  Big Bang. (n.d.). The Universe Adventure Glossary. Retrieved June 10, 2023, from website: http://www.expertglossary.com/definition/big-bang.

  Chicago Manual of Style (CMS)

  Big Bang. pdgusers.lbl.gov. The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. http://www.expertglossary.com/definition/big-bang (accessed: June 10, 2023).

  Modern Language Association (MLA)

  "Big Bang." The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. 10 June. 2023 http://www.expertglossary.com/definition/big-bang.

• Browse Related Terms: Aberration, Big Bang, Cosmological Principle, Curvature of Spacetime, General Relativity, Hubble's Law, Milky Way, Quasar, Recede, Relativity, Spacetime, Supernova

All > Science > Astronomy > Astrophysics

• A plot of the intensity of radiation versus wavelength for a black body.

  Lawrence Berkeley National Laboratory's Physics Division - Cite This Source - This Definition
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  Cite Definition for Black Body Spectrum

  American Psychological Association (APA)

  Black Body Spectrum. (n.d.). The Universe Adventure Glossary. Retrieved June 10, 2023, from website: http://www.expertglossary.com/definition/black-body-spectrum.

  Chicago Manual of Style (CMS)

  Black Body Spectrum. pdgusers.lbl.gov. The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. http://www.expertglossary.com/definition/black-body-spectrum (accessed: June 10, 2023).

  Modern Language Association (MLA)

  "Black Body Spectrum." The Universe Adventure Glossary. Lawrence Berkeley National Laboratory's Physics Division. 10 June. 2023 http://www.expertglossary.com/definition/black-body-spectrum.

• Browse Related Terms: Absorption Spectra, Black Body Spectrum, Electromagnetic Radiation, Energy Spectrum, Light, period, Scatter, Spectra, spectral line, Wavelength