- 1 petametre
-
Largest circle with yellow arrow indicates one light year from Sun; Cat's Eye Nebula on left and Barnard 68 in middle are depicted in front of Comet 1910 A1's orbit. Click image for larger view, details and links to other scales.
To help compare different distances this page lists lengths starting at 1015 m (1 Pm or 1,000,000 million km or 6,700 astronomical units (AU) or 0.11 light years).
Distances shorter than 1 Pm
- 1.9 Pm ± .5 Pm = 12,000 AU = 0.2 light year radius of Cat's Eye Nebula's inner core[1]
- 4.7 Pm = 30,000 AU = half light year diameter of Bok globule Barnard 68[2]
- 7.5 Pm — 50,000 AU — Possible outer boundary of Oort cloud (other estimates are 75,000 to 125,000 or even 189,000 AU (1.6, 2, and 3 light years, respectively))
- 7.7 Pm — 52,000 AU — Aphelion distance of the Great Daylight Comet of 1910
- 9.46 Pm — 63,000 AU — One light year, the distance travelled by light in one year
Distances longer than 10 Pm
See also
Orders of magnitude for length in E notation shorter than one metre: <−24 −24 −23 −22 −21 −20 −19 −18 −17 −16 −15 −14 −13 −12 −11 −10 −9 −8 −7 −6 −5 −4 −3 −2 −1 0 longer than 1 metre: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Notes
- ^ radius = distance times sin(angular diameter/2) = 0.2 light year. Distance = 3.3 ± 0.9 kly; angular diameter = 20 arcseconds(Reed et al. 1999)
- ^ Michael Szpir (May-June 2001). "Bart Bok's Black Blobs". American Scientist. Archived from the original on 2003-06-29. http://web.archive.org/web/20030629033609/http://www.americanscientist.org/template/AssetDetail/assetid/14678. Retrieved 2008-11-19. "Bok globules such as Barnard 68 are only about half a light-year across and weigh in at about two solar masses"
References
- Reed, Darren S.; Balick, Bruce; Hajian, Arsen R.; Klayton, Tracy L.; Giovanardi, Stefano; Casertano, Stefano; Panagia, Nino; Terzian, Yervant (1999). "Hubble Space Telescope Measurements of the Expansion of NGC 6543: Parallax Distance and Nebular Evolution". Astronomical Journal 118 (5): 2430–2441. Bibcode 1999AJ....118.2430R. doi:10.1086/301091
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