1 exametre

Lengths with order of magnitude 1e18m: thousand light year radius circle with yellow arrow and 100 light year circle at right with globular cluster Messier 5 within and Carina Nebula in front; globular cluster Omega Centauri to left of both; part of the 1400 light year wide Tarantula Nebula fills the background.

This list includes distances between 1 and 10 exametres (10¹⁸ m). To help compare different distances this page lists lengths between 10¹⁸ m (1 Em or 105.7 light years) and 10¹⁹ m (1057 light years).

Distances shorter than 1 Em

1.4 Em — 145 light years — Diameter of Messier Object 13 (a typical globular cluster)
1.6 Em — 172 ± 12.5 light years — Diameter of Omega Centauri (one of the largest known globular clusters, perhaps containing over a million stars)^[1]^[2]
3.1 Em — 310 light years — Distance to Canopus according to Hipparcos
6.1 Em — 640 light years — Distance to Betelgeuse according to Hipparcos^[3]
6.2 Em — 650 light years — Distance to the Helix Nebula, located in the constellation Aquarius
7.3 Em — 730 light years — Distance to Rigel according to Hipparcos
9 Em — 1000 light years — Diameter of the Tarantula Nebula

Distances longer than 10 Em

Notes

↑ distance × sin( diameter_angle ), using distance of 5kpc (15.8 ± 1.1 kly) and angle 36.3', = 172 ± 12.5 ly.
↑ van de Ven, G.; van den Bosch, R. C. E.; Verolme, E. K.; de Zeeuw, P. T. (January 11, 2006). "The dynamical distance and intrinsic structure of the globular cluster ω Centauri". Astronomy and Astrophysics 445 (2): 513–543. arXiv:astro-ph/0509228. Bibcode:2006A&A...445..513V. doi:10.1051/0004-6361:20053061. best-fit dynamical distance D=4.8±0.3 kpc ... consistent with the canonical value 5.0±0.2 kpc obtained by photometric methods
↑ Harper, Graham M.; Brown, Alexander; Guinan, Edward F. (April 2008). "A New VLA-Hipparcos Distance to Betelgeuse and its Implications" (PDF). The Astronomical Journal 135 (4): 1430–40. Bibcode:2008AJ....135.1430H. doi:10.1088/0004-6256/135/4/1430.

SI units of length

From smallest to largest (left to right). Commonly used units shown in bold italics.

yoctometre (1×10⁻²⁴ m) zeptometre attometre femtometre picometre nanometre micrometre millimetre centimetre decimetre metre (m) decametre hectometre kilometre megametre gigametre terametre petametre exametre zettametre yottametre (1×10²⁴ m)

Orders of magnitude for length by powers of 10

One metre (10⁰) and shorter	< −12 −12 −11 −10 −9 −8 −7 −6 −5 −4 −3 −2 −1 0

Longer than one 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 <

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1 exametre

See also

Notes