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).
- 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
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, doi:, http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1999AJ....118.2430R
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