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Collection:
NASA Astronomy Picture of the Day Collection Collection NASA Astronomy Picture of the Day Collection Collection
Title:
Loop I in the Northern Sky Title Loop I in the Northern Sky Title
Explanation:
One of the largest coherent structures on the sky is known simply as Loop I [ http://adsbit.harva…] and can best be seen in radio [ http://antwrp.gsfc.…] and X-ray [ http://antwrp.gsfc.…] maps. Spanning over 100 degrees, part of Loop I [ http://adsabs.harva…] appears so prominent in northern sky maps that it is known as the North Polar Spur (NPS). Loop I, shown above [ http://heasarc.gsfc…] in X-ray light [ http://antwrp.gsfc.…], is a thin bubble of gas about 700 light-years across with a center located only about 400 light-years away. Surprisingly, the cause of this immense structure is still debated, but is possibly related to expanding gas from a million-year old supernova [ http://antwrp.gsfc.…]. Loop I [ http://www.msi.umn.…] gas is impacting the nearby Aquila Rift [ http://antwrp.gsfc.…] molecular cloud [ http://dept.physics…], and may create relatively dense fragments of the local interstellar medium [ http://pegasus.phas…]. Were our Sun to pass through one of these fragments in the next few million years, it might affect Earth's climate [ http://adsabs.harva…]. Explanation One of the largest coherent structures on the sky is known simply as Loop I [ http://adsbit.harva…] and can best be seen in radio [ http://antwrp.gsfc.…] and X-ray [ http://antwrp.gsfc.…] maps. Spanning over 100 degrees, part of Loop I [ http://adsabs.harva…] appears so prominent in northern sky maps that it is known as the North Polar Spur (NPS). Loop I, shown above [ http://heasarc.gsfc…] in X-ray light [ http://antwrp.gsfc.…], is a thin bubble of gas about 700 light-years across with a center located only about 400 light-years away. Surprisingly, the cause of this immense structure is still debated, but is possibly related to expanding gas from a million-year old supernova [ http://antwrp.gsfc.…]. Loop I [ http://www.msi.umn.…] gas is impacting the nearby Aquila Rift [ http://antwrp.gsfc.…] molecular cloud [ http://dept.physics…], and may create relatively dense fragments of the local interstellar medium [ http://pegasus.phas…]. Were our Sun to pass through one of these fragments in the next few million years, it might affect Earth's climate [ http://adsabs.harva…]. Explanation
Credit and Copyright:
ROSAT [ http://heasarc.gsfc…], MPI [ http://www.MPA-Garc…], ESA [ http://www.esrin.es…], NASA [ http://www.nasa.gov/] Credit_and_Copyright ROSAT [ http://heasarc.gsfc…], MPI [ http://www.MPA-Garc…], ESA [ http://www.esrin.es…], NASA [ http://www.nasa.gov/] Credit and Copyright
keyword:
supernova keyword supernova keyword
keyword:
stellar wind keyword stellar wind keyword
keyword:
OB associtation keyword OB associtation keyword
facet_where:
Goddard Space Flight Center (GSFC) facet_where Goddard Space Flight Center (GSFC) facet_where
facet_where:
Washington, D.C. facet_where Washington, D.C. facet_where
facet_what:
Earth facet_what Earth facet_what
facet_what:
Sun facet_what Sun facet_what
facet_what:
Polar facet_what Polar facet_what
facet_what:
Aquila facet_what Aquila facet_what
facet_what:
Pegasus facet_what Pegasus facet_what
facet_what:
ROSAT facet_what ROSAT facet_what
original url:
http://antwrp.gsfc.… original_url http://antwrp.gsfc.… original url
UID:
SPD-APOD-ap990503 UID SPD-APOD-ap990503 UID

Loop I in the Northern Sky

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Loop I in the Northern Sky