Articles related to "Astrophysics"
Blackbodies in Astrophysics
The wavelengths of the electromagnetic radiation emitted by an ideal blackbody radiator depends only on the temperature.
ideal blackbody radiator • electromagnetic radiation • blackbody • astrophysics • astrophysical applications
The wavelengths of the electromagnetic radiation emitted by an ideal blackbody radiator depends only on the temperature.
ideal blackbody radiator • electromagnetic radiation • blackbody • astrophysics • astrophysical applications
Formation of Structure in the Universe
Can we get from the microwave background to galaxies with cold dark matter?
cold dark matter • cdm • cosmic microwave background • cmb • astronomy
Can we get from the microwave background to galaxies with cold dark matter?
cold dark matter • cdm • cosmic microwave background • cmb • astronomy
Rockets
Describes the basics of chemical rockets, with a blurb on nuclear rockets.
rockets • nuclear • chemical • astrophysics • astronomy
Describes the basics of chemical rockets, with a blurb on nuclear rockets.
rockets • nuclear • chemical • astrophysics • astronomy
Star Formation Eludes Explanation
How to form stars is obviously a fundamental problem for astronomers. However, it remains one of the most daunting physical challenges in the field.
stars • formation of stars • astrophysics • gravitational collapse • angular momentum
How to form stars is obviously a fundamental problem for astronomers. However, it remains one of the most daunting physical challenges in the field.
stars • formation of stars • astrophysics • gravitational collapse • angular momentum
The Planck Time and the Big Bang
In the big bang theory, the Planck time is the first miniscule fraction of a second after the initial big bang. The universe had just come into being.
big bang theory • universe • planck time • cosmic background radiation • hubble plot
In the big bang theory, the Planck time is the first miniscule fraction of a second after the initial big bang. The universe had just come into being.
big bang theory • universe • planck time • cosmic background radiation • hubble plot
Steady State and Big Bang Theories
Both the steady state and big bang cosmological theories are based on certain fundamental cosmological assumptions and observations.
steady state theory • big bang theory • cosmology • cosmological principle • expansion of the universe
Both the steady state and big bang cosmological theories are based on certain fundamental cosmological assumptions and observations.
steady state theory • big bang theory • cosmology • cosmological principle • expansion of the universe
Heat from Origin of the Universe
The big bang theory predicts the universe has cooled to a few degrees above absolute zero and is awash in a faint glow of the 3K microwave cosmic background radiation.
cosmic background radiation • cosmic microwave background radiation • big bang theory • origin of the universe • 3k background radiation
The big bang theory predicts the universe has cooled to a few degrees above absolute zero and is awash in a faint glow of the 3K microwave cosmic background radiation.
cosmic background radiation • cosmic microwave background radiation • big bang theory • origin of the universe • 3k background radiation
Nucleosynthesis in the Big Bang
The lightest four elements on the periodic table were made in nuclear fusion reactions shortly after the big bang.
big bang theory • universe • elementary particles • protons • cosmic nucleosynthesis
The lightest four elements on the periodic table were made in nuclear fusion reactions shortly after the big bang.
big bang theory • universe • elementary particles • protons • cosmic nucleosynthesis
A Millennium of Science
Links to the best in sites about science in the past millennium.
millenium • science • kids • teens • study
Links to the best in sites about science in the past millennium.
millenium • science • kids • teens • study
Riccardo Giacconi - The Executive Astronomer
The 2003 co-recipient of the Nobel Prize for Physics was Riccardo Giacconi, current president of the Associated Universities Incorporated, and an internationally reknown astronomer credited with locating the first cosmic source of X-rays.
giacconi • stsci • uhuru • hubble • skylab
The 2003 co-recipient of the Nobel Prize for Physics was Riccardo Giacconi, current president of the Associated Universities Incorporated, and an internationally reknown astronomer credited with locating the first cosmic source of X-rays.
giacconi • stsci • uhuru • hubble • skylab
Steady State Cosmology
The steady state theory was a mid 20th century alternative to the big bang theory. It suggested that there was no moment of creation. The universe has always existed.
steady state theory • big bang theory • cosmology • cosmological principle • perfect cosmological principle
The steady state theory was a mid 20th century alternative to the big bang theory. It suggested that there was no moment of creation. The universe has always existed.
steady state theory • big bang theory • cosmology • cosmological principle • perfect cosmological principle
Discovering The Expanding Universe
Edwin Hubble along with his assistant Milton Humason made the observations of distant galaxy redshifts that showed the expansion of the universe.
expansion of the universe • hubble • humason • redshifts • big bang theory
Edwin Hubble along with his assistant Milton Humason made the observations of distant galaxy redshifts that showed the expansion of the universe.
expansion of the universe • hubble • humason • redshifts • big bang theory
Origin of the Chemical Elements
You are recycled stardust. The atoms in our bodies were manufactured in stars or supernovae and recycled by supernova explosions.
origin of elements • supernova • periodic table • type ii supernova • big bang theory
You are recycled stardust. The atoms in our bodies were manufactured in stars or supernovae and recycled by supernova explosions.
origin of elements • supernova • periodic table • type ii supernova • big bang theory
Predicting the Expanding Universe
Hubble discovered the expansion of the universe, but De Sitter, Friedman, & Lemaitre used Einstein's general relativity to predict the expanding universe & the big bang.
expansion of the universe • general relativity • einstein • de sitter • friedman
Hubble discovered the expansion of the universe, but De Sitter, Friedman, & Lemaitre used Einstein's general relativity to predict the expanding universe & the big bang.
expansion of the universe • general relativity • einstein • de sitter • friedman
Spectrum of the Andromeda Galaxy
Vesto M. Slipher was the first astronomer to measure the spectrum of an external galaxy. His work led to Hubble's discovery that the universe is expanding.
vesto slipher • slipher • andromeda galaxy • galaxies • spectra
Vesto M. Slipher was the first astronomer to measure the spectrum of an external galaxy. His work led to Hubble's discovery that the universe is expanding.
vesto slipher • slipher • andromeda galaxy • galaxies • spectra
Alexei Abrikosov - Type II Superconductors and the Abrikosov Vortex Lattice
Alexei Abrikosov left the former Soviet Union to work at the Argonne National Laboratory in 1991. He shared the Nobel Prize in Physics in 2003 for his work on type II superconductors.
alexei abrikosov • nobel • physics • type ii superconductor • abrikosov vortex lattice
Alexei Abrikosov left the former Soviet Union to work at the Argonne National Laboratory in 1991. He shared the Nobel Prize in Physics in 2003 for his work on type II superconductors.
alexei abrikosov • nobel • physics • type ii superconductor • abrikosov vortex lattice
Rose Center for Earth and Space
Unlike any other facility of its kind, the Rose Center for Earth and Space is simply AMAZING.
new york city • rose center for earth and space • american museum of natural history • landmark • architectural
Unlike any other facility of its kind, the Rose Center for Earth and Space is simply AMAZING.
new york city • rose center for earth and space • american museum of natural history • landmark • architectural
Types of Stars
Stellar spectral classification helps astrophysicists understand the lives of stars.
spectrum • electromagnetic spectrum • star • astrophysics • stellar classification
Stellar spectral classification helps astrophysicists understand the lives of stars.
spectrum • electromagnetic spectrum • star • astrophysics • stellar classification
Edwin Hubble, Scientist
Brief bio and discoveries of Edwin Hubble, who discovered more galaxies and that the universe expands; also known for Hubble's Law.
edwin hubble • edwin hubble scientist • edwin hubble brief bio • edwin hubble galaxies • hubble's law
Brief bio and discoveries of Edwin Hubble, who discovered more galaxies and that the universe expands; also known for Hubble's Law.
edwin hubble • edwin hubble scientist • edwin hubble brief bio • edwin hubble galaxies • hubble's law
GUTS and Inflation in the Big Bang
Shortly after the initial big bang, the universe went through a period of very rapid expansion called the inflationary period.
big bang theory • universe • general relativity • guts • inflationary era
Shortly after the initial big bang, the universe went through a period of very rapid expansion called the inflationary period.
big bang theory • universe • general relativity • guts • inflationary era
History of the Big Bang Theory
George Gamow was an early advocate of the big bang theory for the origin of the universe. Many of his details were incorrect, but he got the essential idea right.
history of the big bang theory • universe • gamow • lemaitre • origin of the universe
George Gamow was an early advocate of the big bang theory for the origin of the universe. Many of his details were incorrect, but he got the essential idea right.
history of the big bang theory • universe • gamow • lemaitre • origin of the universe
Origin of Matter in the Universe
In the big bang theory, matter formed in the early universe as elementary particles including protons, electrons, and neutrons.
big bang theory • universe • elementary particles • protons • electrons
In the big bang theory, matter formed in the early universe as elementary particles including protons, electrons, and neutrons.
big bang theory • universe • elementary particles • protons • electrons
Very Brief History of the Universe
A brief overview of the history of the universe from its origin in the big bang to the origin of life on Earth and how the needed raw materials for life formed.
history of the universe • big bang • big bang theory • origin of the universe • galaxies
A brief overview of the history of the universe from its origin in the big bang to the origin of life on Earth and how the needed raw materials for life formed.
history of the universe • big bang • big bang theory • origin of the universe • galaxies
Black Holes Space/Time Distortion
Like sharks in the ocean millions of Black Holes wander the universe. And like those creatures the universe needs these galactic wanders to maintain stability.
black hole • event horizon • stellar mass • photon sphere • super nova
Like sharks in the ocean millions of Black Holes wander the universe. And like those creatures the universe needs these galactic wanders to maintain stability.
black hole • event horizon • stellar mass • photon sphere • super nova
The Cosmic Background Radiation
Penzias and Wilson accidentally discovered the 3K cosmic microwave background radiation, which provided strong evidence supporting the big bang theory.
cosmic background radiation • microwave • big bang theory • penzias • wilson
Penzias and Wilson accidentally discovered the 3K cosmic microwave background radiation, which provided strong evidence supporting the big bang theory.
cosmic background radiation • microwave • big bang theory • penzias • wilson
Abbot and the Solar Constant
Samuel Pierpont Langley and Charles Greeley Abbot pioneered efforts to measure the solar constant and solar variability.
solar • sun • solar constant • solar irradiance • charles greeley abbot
Samuel Pierpont Langley and Charles Greeley Abbot pioneered efforts to measure the solar constant and solar variability.
solar • sun • solar constant • solar irradiance • charles greeley abbot
Solar Constant and Variable Sun
Many stars are variable stars that change brightness. Any possible solar variations must be very small, but does the Sun's energy output vary?
solar • sun • solar constant • solar irradiance • charles greeley abbot
Many stars are variable stars that change brightness. Any possible solar variations must be very small, but does the Sun's energy output vary?
solar • sun • solar constant • solar irradiance • charles greeley abbot
Water on Extrasolar Planets
In early April 2007 astronomers announced the discovery of water on a planet orbiting the star, HD 209458. How is it possible to detect water on an extrasolar planet?
spectroscopy • extrasolar planet • astronomical • infrared • hd 209458b
In early April 2007 astronomers announced the discovery of water on a planet orbiting the star, HD 209458. How is it possible to detect water on an extrasolar planet?
spectroscopy • extrasolar planet • astronomical • infrared • hd 209458b
Full-Text Resources on the Web
No cost, full-text article databases and resources available on the Web.
research • full-text articles • full-text databases • online research • internet research
No cost, full-text article databases and resources available on the Web.
research • full-text articles • full-text databases • online research • internet research
Climate Change & Solar Variability
Scientists have evidence that the Little Ice Age resulted from changes in the Sun's energy output associated with long term sunspot and other solar activity cycles.
little ice age • climate changes • solar • maunder minimum • sun
Scientists have evidence that the Little Ice Age resulted from changes in the Sun's energy output associated with long term sunspot and other solar activity cycles.
little ice age • climate changes • solar • maunder minimum • sun
Stellar Populations in the Galaxy
During World War II, Baade discovered that there were distinct stellar populations: The older Population II stars and Younger Population I stars.
stellar • stars • population i • population ii • walter baade
During World War II, Baade discovered that there were distinct stellar populations: The older Population II stars and Younger Population I stars.
stellar • stars • population i • population ii • walter baade
The Physics Family
Physics is a discipline of science that includes many interrelated and active branches.
branches of physics • classic physics • classical physics • modern physics • applied physics
Physics is a discipline of science that includes many interrelated and active branches.
branches of physics • classic physics • classical physics • modern physics • applied physics
Astronomers Find Atmosphere on Planet Outside Solar System
Extra-solar planet has a gas atmosphere similar to Jupiter orbiting a nearby star.
extrasolar • hubble
Extra-solar planet has a gas atmosphere similar to Jupiter orbiting a nearby star.
extrasolar • hubble
Ring
Review of author Stephen Baxter's science fiction novel, Ring.
stephen baxter • author • review • science fiction • novel
Review of author Stephen Baxter's science fiction novel, Ring.
stephen baxter • author • review • science fiction • novel
Science Careers for Women
Science Careers for Women - Special Chat with Dr. Andreadis Andreadis, Associate Professor in the Department of Cell Biology at .K. Shriver Center, University of Massachusetts Medical School. This chat was given as part of the "Take Our Daughers To Work" event.
science • women • careers • chat • andreadis
Science Careers for Women - Special Chat with Dr. Andreadis Andreadis, Associate Professor in the Department of Cell Biology at .K. Shriver Center, University of Massachusetts Medical School. This chat was given as part of the "Take Our Daughers To Work" event.
science • women • careers • chat • andreadis
Silicon and Astronomy II
A brief account of the impact of computers on theoretical cosmology
computers in astronomy • data processing
A brief account of the impact of computers on theoretical cosmology
computers in astronomy • data processing
Carl Sagan's Life and Career
Carl Sagan (1934-1996) is probably best known for hosting the TV series Cosmos, but the famous scientist had a rich, lifelong career of popularizing science.
carl sagan • carl sagan bio • cosmos • carl sagan books • ronald reagon
Carl Sagan (1934-1996) is probably best known for hosting the TV series Cosmos, but the famous scientist had a rich, lifelong career of popularizing science.
carl sagan • carl sagan bio • cosmos • carl sagan books • ronald reagon
Falling into Black Holes
What would happen to Earth's orbit around the Sun, if the Sun were to suddenly collapse into a black hole?
black hole • sun • collapse • orbit • gravitational
What would happen to Earth's orbit around the Sun, if the Sun were to suddenly collapse into a black hole?
black hole • sun • collapse • orbit • gravitational
Galactic Mergers in the Universe
Though it's a hefty two billion years away, the future event that has astronomers buzzing is the expected galactic merger of the Milky Way and the spiral Andromeda Galaxy
milky way • andromeda galaxy • evolution of galaxies • galactic collisions • galaxy
Though it's a hefty two billion years away, the future event that has astronomers buzzing is the expected galactic merger of the Milky Way and the spiral Andromeda Galaxy
milky way • andromeda galaxy • evolution of galaxies • galactic collisions • galaxy
Carl E Wieman - The Fifth State of Matter
Carl E Wieman shares the 2001 Nobel Prize for Physics for his discovery of the Bose-Einstein condensate, the fifth state of matter.
bose-einstein condensate • quantum mechanics • atomic physics • nobel • physicist
Carl E Wieman shares the 2001 Nobel Prize for Physics for his discovery of the Bose-Einstein condensate, the fifth state of matter.
bose-einstein condensate • quantum mechanics • atomic physics • nobel • physicist
Susan Jocelyn Bell-Burnell - Radio, Gamma Ray, X-ray, Infrared Waves from the Stars
S. Jocelyn Bell was a failure at age eleven, went on to attain a Ph.D. in astronomy and discover the first four pulsars.
bell-burnell • pulsar • radio astronomy • gamma ray astronomy • x-ray astronomy
S. Jocelyn Bell was a failure at age eleven, went on to attain a Ph.D. in astronomy and discover the first four pulsars.
bell-burnell • pulsar • radio astronomy • gamma ray astronomy • x-ray astronomy
The Cosmic Distance Ladder, I: Parallax
A brief discussion of parallax as a distance indicator in astronomoy.
parallax • distance indicators • astronomy • hipparcos • cosmic distance ladder
A brief discussion of parallax as a distance indicator in astronomoy.
parallax • distance indicators • astronomy • hipparcos • cosmic distance ladder
Calculating Density of Black Holes
To form a black hole, matter must be compressed to such high densities that it is smaller than the event horizon or Schwarzschild radius.
black hole • event horizon • schwarzschild radius • density • energy density
To form a black hole, matter must be compressed to such high densities that it is smaller than the event horizon or Schwarzschild radius.
black hole • event horizon • schwarzschild radius • density • energy density
Comet Holmes Suddenly Brightens
An unexpected brightening has brought Comet 17P/Holmes into naked-eye visibility. Catch it while you can.
comet holmes brightens • comet suddenly brightens • new comet seen in sky • comet appears in constellation perseus • comet holmes seen without telescope
An unexpected brightening has brought Comet 17P/Holmes into naked-eye visibility. Catch it while you can.
comet holmes brightens • comet suddenly brightens • new comet seen in sky • comet appears in constellation perseus • comet holmes seen without telescope
Crab Nebula Supernova Observations
The supernova that formed the Crab Nebula in 1054 was observed by the ancient Chinese, but there are no known western observations.
crab nebula supernova • july 4 1054 • chinese • anasazi • chaco canyon
The supernova that formed the Crab Nebula in 1054 was observed by the ancient Chinese, but there are no known western observations.
crab nebula supernova • july 4 1054 • chinese • anasazi • chaco canyon
Detecting Planets Orbiting Stars
Astronomers use high resolution spectroscopy and the Doppler effect to discover extrasolar planets, which are planets outside our solar system.
extrasolar planets • discovering • high resolution • spectroscopy • doppler effect
Astronomers use high resolution spectroscopy and the Doppler effect to discover extrasolar planets, which are planets outside our solar system.
extrasolar planets • discovering • high resolution • spectroscopy • doppler effect
Discovery of Helium in the Sun
Using spectroscopy, helium was first discovered in the Sun. Spectral lines labeled coronium and nebulium did not fit into the periodic table of the elements.
helium • periodic table • chromosphere • spectroscopy • solar corona
Using spectroscopy, helium was first discovered in the Sun. Spectral lines labeled coronium and nebulium did not fit into the periodic table of the elements.
helium • periodic table • chromosphere • spectroscopy • solar corona
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