Réaltra

Is éard atá i réaltra ná córas réaltaí, iarsmaí réaltacha, gás idir-réaltach, deannach, damhna dorcha, ceangailte le imtharraingt.[1][2] Réaltraí, ar an meán measta 100 milliún réalta,[3] raon i méid ó abhaic a bhfuil níos lú ná céad milliún réalta, go dtí na réaltraí is mó ar a dtugtar - ollfathaigh le céad trilliún réalta,[4] fithis gach ceann acu lárionad mais a réaltra.

Tá NGC 4414, réaltra bíseach tipiciúil sa réaltbhuíon Coma Berenices, timpeall 55,000 solasbhliain ar trastomhas agus timpeall 60 milliún solasbhliain ón Domhan.

Tagairtí

Sparke, L. S.; Gallagher, J. S. III (2000). Galaxies in the Universe: An Introduction. Cambridge University Press. ISBN 9780521597401. Cartlainne ón mbunleathanach ar 24 Márta 2021.
Hupp, E.; Roy, S.; Watzke, M. (12 Lúnasa 2006). "NASA Finds Direct Proof of Dark Matter" Curtha i gcartlann 2020-03-28 ar an Wayback Machine. NASA. Cartlainne ón mbunleathanach ar 28 Márta 2020.
Howell, Elizabeth; Harvey, Ailsa (February 11, 2022). "How many stars are in the universe? - Can we estimate the total number of stars?". Space.com.
Uson, J. M.; Boughn, S. P.; Kuhn, J. R. (1990). "The central galaxy in Abell 2029 – An old supergiant". Science. 250 (4980): 539–540. Bibcode:1990Sci...250..539U. doi:10.1126/science.250.4980.539. PMID 17751483. S2CID 23362384.

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[1] Sparke, L. S.; Gallagher, J. S. III (2000). Galaxies in the Universe: An Introduction. Cambridge University Press. ISBN 9780521597401. Cartlainne ón mbunleathanach ar 24 Márta 2021.

[2] Hupp, E.; Roy, S.; Watzke, M. (12 Lúnasa 2006). "NASA Finds Direct Proof of Dark Matter" Curtha i gcartlann 2020-03-28 ar an Wayback Machine. NASA. Cartlainne ón mbunleathanach ar 28 Márta 2020.

[3] Howell, Elizabeth; Harvey, Ailsa (February 11, 2022). "How many stars are in the universe? - Can we estimate the total number of stars?". Space.com.

[4] Uson, J. M.; Boughn, S. P.; Kuhn, J. R. (1990). "The central galaxy in Abell 2029 – An old supergiant". Science. 250 (4980): 539–540. Bibcode:1990Sci...250..539U. doi:10.1126/science.250.4980.539. PMID 17751483. S2CID 23362384.