Lêer:Helix-nebula-detail-hubble.jpg

Oorspronklike lêer (502 × 656 piksels, lêergrootte: 55 KG, MIME-tipe: image/jpeg)

Hierdie lêer kom vanaf Wikimedia Commons en kan ook in ander projekte gebruik word. Die beskrywing op die lêer se inligtingsblad word hieronder weergegee.

Beskrywing

These gigantic, tadpole-shaped objects are probably the result of a dying star's last gasps. Dubbed "cometary knots" because their glowing heads and gossamer tails resemble comets, the gaseous objects probably were formed during a star's final stages of life.

Hubble astronomer C. Robert O'Dell and graduate student Kerry P. Handron of Rice University in Houston, Texas discovered thousands of these knots with the Hubble Space Telescope while exploring the Helix nebula, the closest planetary nebula to Earth at 450 light-years away in the constellation Aquarius. Although ground-based telescopes have revealed such objects, astronomers have never seen so many of them. The most visible knots all lie along the inner edge of the doomed star's ring, trillions of miles away from the star's nucleus. Although these gaseous knots appear small, they're actually huge. Each gaseous head is at least twice the size of our solar system; each tail stretches for 100 billion miles, about 1,000 times the distance between the Earth and the Sun. Astronomers theorize that the doomed star spews hot, lower-density gas from its surface, which collides with cooler, higher-density gas that had been ejected 10,000 years before. The crash fragments the smooth cloud surrounding the star into smaller, denser finger-like droplets, like dripping paint.

This image was taken in August, 1994 with Hubble's Wide Field Planetary Camera 2. The red light depicts nitrogen emission ([NII] 6584A); green, hydrogen (H-alpha, 6563A); and blue, oxygen (5007A).
Datum
Bron http://hubblesite.org/newscenter/newsdesk/archive/releases/1996/13/image/b (direct link)
Outeur C. Robert O'Dell and Kerry P. Handron (Rice University), NASA
Toestemming
(Hergebruik van die lêer)
Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
Warnings:

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

uitbeelding

Lêergeskiedenis

Klik op die datum/tyd om te sien hoe die lêer destyds gelyk het.

Datum/TydDuimnaelDimensiesGebruikerOpmerking
huidig13:35, 31 Desember 2011Duimnaelskets vir weergawe vanaf 13:35, 31 Desember 2011502 × 656 (55 KG)Prof. ProfessorsonWithout border and caption, from http://hubblesite.org/newscenter/archive/releases/1996/13/image/b/ (http://imgsrc.hubblesite.org/hu/db/images/hs-1996-13-b-full_jpg.jpg).
14:08, 29 Oktober 2011Duimnaelskets vir weergawe vanaf 14:08, 29 Oktober 2011600 × 840 (79 KG)Audriusa{{Information |Description=Helix Nebula knots |Source=http://de.wikipedia.org/wiki/Datei:Helix-nebula-detail-hubble.jpg, http://hubblesite.org/newscenter/newsdesk/archive/releases/1996/13/image/b |Date= |Author=NASA |Permission={{PD-NASA}} |other_versions

Die volgende bladsy gebruik dié lêer:

Globale lêergebruik

Die volgende ander wiki's gebruik hierdie lêer: