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...)|Cygnus X]] star complex) from the [[Sun]], always within the [[Orion Arm|Local Arm (Orion Arm)]] itself, spanning about 40% of its length and on average 2 ...Nebula]] (as a very luminous feature of the less bright [[Orion molecular cloud complex]]) and broad-clouds [[North America Nebula]] (and [[Pelican Nebula] ...

...5 x 10¹⁹ cm⁻².<ref name=Lockman/> There is a diffuse cloud covering half of the field.<ref name=Lockman/><ref name=Schlegel>{{ cite jo * [[Interstellar medium]] ...

{{expert needed|Astronomy|reason= this article shows bias towards the local region, there are known HVCs around the Andromeda Galaxy, but this treats t ...ut the [[galactic halo]] of the [[Milky Way]]. Their bulk motions in the [[local standard of rest]] have velocities which are measured in excess of 70–90&nb ...

...019.tif|thumb|upright=1.5|right|[[2I/Borisov]] comet, the second confirmed interstellar object, photographed in late-2019 beside a distant galaxy]] ...''.<ref>{{cite journal|first1=Dimitri|last1=Veras|title=Creating the first interstellar interloper|journal=Nature Astronomy|date=13 April 2020|volume=4|issue=9|iss ...

...rference with local life, the targets may be young planetary systems where local life is unlikely. Directed panspermia can be motivated by [[biotic ethics]] ...ith local life at the targets, but targeting young planetary systems where local life, especially advanced life, could not have started yet, avoids this pro ...

...al profiles of their measured data. Comet or meteoroid streams, and even [[interstellar dust]] were identified in the data. ...June 2022 |bibcode=1993JGR....9817029D}}</ref> of the interplanetary dust cloud; also the zodiacal light intensities observed by the Helios Zodiacal light ...

{{Short description|Interstellar comet passing through the Solar System, discovered in 2019}} | next_p=''interstellar object''}} ...

...Infrared Survey Explorer]] (WISE). It is the coldest brown dwarf found in interstellar space, having a temperature of about {{convert|285|K|C F}}.<ref name="Luhma ...nterstellar medium]]. This could mean that WISE 0855 formed from a younger cloud, but more measurements of ¹⁵N in other brown dwarfs are needed t ...

...ref> This is the star's ''actual motion'' relative to the [[Sun]] or the [[local standard of rest]] (LSR). The latter is typically taken as a position at th | title=Local kinematics and the local standard of rest ...

{{Short description|Interstellar object passed near Earth in 2017}} ...iroff |first2=Robert |author-link2=Robert J. Nemiroff |title=A/2017 U1: An Interstellar Visitor |url=https://apod.nasa.gov/apod/ap171103.html |website=[[Astronomy ...

...ournal |last1=Nilsson |first1=C. |title=Some Doubts about the Earth's Dust Cloud |journal=Science |date=September 1966 |volume=193 |issue=3741 |pages=1242–1 ...h for the Cosmic Infrared Background. II. Model of the Interplanetary Dust Cloud |journal=The Astrophysical Journal |date=November 1998 |volume=508 |issue=1 ...

...n|group=lower-alpha|name=first|In astrophysics, diffuse material refers to interstellar or intergalactic matter that is spread out and not concentrated in a specif ...netary system]]s. The accreted gas in this case comes from the [[molecular cloud]] out of which the star has formed rather than a companion star. ...

...cale height]].<ref name=p5/> This instability also explains the [[mushroom cloud]] which forms in processes such as volcanic eruptions and atomic bombs. ...the colloids are slightly denser than the liquid mixture, this leads to a local increase of density with height. This instability, even in the absence of a ...

...awai‘i and Chile (iotw2225c).jpg|thumb|upright=2|The [[interplanetary dust cloud]] illuminated and visible as [[zodiacal light]], with its parts the ''false ...ch in turn feed and maintain the [[interplanetary dust cloud|Zodiacal dust cloud]].<ref>{{cite journal |last1=Whipple |first1=F.L. |title=A comet model. I. ...

...ions without Planet Nine an insufficient number are produced from the Oort cloud relative to observations, however.<ref name="Kaib_etal_2019" /> A few of th ====Oort cloud and comets==== ...

...the universe will mean that the [[observable universe]] becomes limited to local galaxies. There are various scenarios for the far future and [[ultimate fat ...energy by radiation, forms dense objects and also [[Interstellar cloud|gas cloud]]s when it collapses. ...

...gravitationally [[Perturbation (astronomy)|perturb]] members of the [[Oort cloud]], a halo of icy bodies orbiting at the edge of the Solar System, thereafte ...life on Earth could potentially survive for far longer if it survived the interstellar journey.{{sfn|Adams|2008|pp=33–44}} ...

...lite]] or other [[spacecraft]] is above the [[Horizontal coordinate system|local horizon]] and available for [[radio]] communication with a particular [[gro ...], its changing [[Orientation (geometry)|orientation]] with respect to the local air flow is represented by two critical angles, the angle of attack of the ...

...exist. Most known matter in the universe is either gas (as [[interstellar cloud]]s) or plasma (as [[star]]s). ...strength and directional nature of hydrogen bonds drives the formation of local "networks" or "clusters" of molecules. Due to the relative importance of th ...

...physical association with the [[Milky Way]] galaxy or the Small Magellanic Cloud. The burst became known as the Lorimer Burst.<ref>{{cite journal | doi = 10 ...tected (allowing a measurement of [[Faraday effect#Faraday rotation in the interstellar medium|Faraday rotation]]). Measurement of the signal's [[dispersion measur ...