Galileo Galilei: Siderius Nuncius, Venice, 1610. English Translation published at Bard College, Hudson NY" October 9, 2003 English Translation [1] 7 Şubat 2012 tarihinde Wayback Machine sitesinde arşivlendi. Original Latin version [2] 29 Haziran 2011 tarihinde Wayback Machine sitesinde arşivlendi.
liberliber.it
Galileo Galilei: Siderius Nuncius, Venice, 1610. English Translation published at Bard College, Hudson NY" October 9, 2003 English Translation [1] 7 Şubat 2012 tarihinde Wayback Machine sitesinde arşivlendi. Original Latin version [2] 29 Haziran 2011 tarihinde Wayback Machine sitesinde arşivlendi.
Tom Pope and Jim Mosher: Page on Galileo's February 4, 1617 notebook drawing of the Trapezium region, May 2, 2006 "Perhaps significantly, Galileo makes no mention of having noticed the now well-known gas cloud, M42, surrounding the Trapezium stars."[3] 11 Ağustos 2011 tarihinde Wayback Machine sitesinde arşivlendi.
u-strasbg.fr
simbad.u-strasbg.fr
"SIMBAD Astronomical Database". NAME ORI Id -- Association of Stars -- Open (galactic) Cluster. 15 Nisan 2016 tarihinde kaynağından arşivlendi. Erişim tarihi: 29 Ocak 2013.
web.archive.org
"SIMBAD Astronomical Database". NAME ORI Id -- Association of Stars -- Open (galactic) Cluster. 15 Nisan 2016 tarihinde kaynağından arşivlendi. Erişim tarihi: 29 Ocak 2013.
Galileo Galilei: Siderius Nuncius, Venice, 1610. English Translation published at Bard College, Hudson NY" October 9, 2003 English Translation [1] 7 Şubat 2012 tarihinde Wayback Machine sitesinde arşivlendi. Original Latin version [2] 29 Haziran 2011 tarihinde Wayback Machine sitesinde arşivlendi.
Tom Pope and Jim Mosher: Page on Galileo's February 4, 1617 notebook drawing of the Trapezium region, May 2, 2006 "Perhaps significantly, Galileo makes no mention of having noticed the now well-known gas cloud, M42, surrounding the Trapezium stars."[3] 11 Ağustos 2011 tarihinde Wayback Machine sitesinde arşivlendi.
