CMBR Dipole: Speeding Through the Universe

COLLECTION NAME:

NASA Astronomy Picture of the Day Collection

mediaCollectionId

NVA2~4~4

NASA Astronomy Picture of the Day Collection

Collection

true

Title:

CMBR Dipole: Speeding Through the Universe

title

CMBR Dipole: Speeding Through the Universe

Title

false

Explanation:

Our Earth [ http://antwrp.gsfc.… ] is not at rest. The Earth moves around the Sun [ http://antwrp.gsfc.… ]. The Sun orbits the center of the Milky Way Galaxy [ http://antwrp.gsfc.… ]. The Milky Way Galaxy orbits in the Local Group of Galaxies [ http://www.seds.org… ]. The Local Group falls toward the Virgo Cluster of Galaxies [ http://antwrp.gsfc.… ]. But these speeds are less than the speed that all of these objects together move relative to the cosmic microwave background radiation [ http://www.astro.ub… ] (CMBR). In the above all-sky map [ http://lambda.gsfc.… ], radiation in the Earth's direction of motion appears blueshifted [ http://imagine.gsfc… ] and hence hotter, while radiation on the opposite side of the sky is redshifted [ http://www.space.co… ] and colder. The map [ http://map.gsfc.nas… ] indicates that the Local Group [ http://en.wikipedia… ] moves at about 600 kilometers per second relative to this primordial radiation [ http://www.nap.edu/… ]. This high speed was initially unexpected and its magnitude is still unexplained. Why are we moving so fast [ http://en.wikipedia… ]? What is out there? [ http://antwrp.gsfc.… ]

explanation

Our Earth [ http://antwrp.gsfc.nasa.gov/apod/ap050102.html ] is not at rest. The Earth moves around the Sun [ http://antwrp.gsfc.nasa.gov/apod/sun.html ]. The Sun orbits the center of the Milky Way Galaxy [ http://antwrp.gsfc.nasa.gov/apod/milky_way.html ]. The Milky Way Galaxy orbits in the Local Group of Galaxies [ http://www.seds.org/messier/more/local.html ]. The Local Group falls toward the Virgo Cluster of Galaxies [ http://antwrp.gsfc.nasa.gov/apod/ap050213.html ]. But these speeds are less than the speed that all of these objects together move relative to the cosmic microwave background radiation [ http://www.astro.ubc.ca/people/scott/faq_basic.html ] (CMBR). In the above all-sky map [ http://lambda.gsfc.nasa.gov/product/cobe/dmr_image.cfm ], radiation in the Earth's direction of motion appears blueshifted [ http://imagine.gsfc.nasa.gov/docs/dictionary.html#blueshift ] and hence hotter, while radiation on the opposite side of the sky is redshifted [ http://www.space.com/scienceastronomy/redshift.html ] and colder. The map [ http://map.gsfc.nasa.gov/ ] indicates that the Local Group [ http://en.wikipedia.org/wiki/Local_group ] moves at about 600 kilometers per second relative to this primordial radiation [ http://www.nap.edu/readingroom/books/cosmology/2.html#CMBR ]. This high speed was initially unexpected and its magnitude is still unexplained. Why are we moving so fast [ http://en.wikipedia.org/wiki/Cosmic_microwave_background ]? What is out there? [ http://antwrp.gsfc.nasa.gov/apod/ap000104.html ]

Explanation

false

Credit and Copyright:

DMR, COBE, NASA, Four-Year Sky Map

credit_and_copyright

DMR, COBE, NASA, Four-Year Sky Map

Credit and Copyright

false

facet_where:

Goddard Space Flight Center (GSFC)

facet_where

Goddard Space Flight Center (GSFC)

facet_where

false

facet_what:

COBE

facet_what

COBE

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false

original url:

http://antwrp.gsfc.…

original_url

http://antwrp.gsfc.nasa.gov/apod/ap050508.html

original url

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UID:

SPD-APOD-ap050508

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SPD-APOD-ap050508

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false

MEDIA INFORMATION

CMBR Dipole: Speeding Through the Universe