الخصائص الطبيعية للشمس والطاقة التي تنتجها. حجم الارض بالنسبة للشمس

"Genesis capturing the Sun: Solar wind irradiation at Lagrange 1" "Theory and Observation in Medieval Astronomy"
Relativity Milestones: Timeline of Notable Relativity Scientists and Contributions• Annual Review of Astronomy and Astrophysics "Swansong Biospheres: Refuges for life and novel microbial biospheres on terrestrial planets near the end of their habitable lifetimes" PDF

"The astrophysical environment of the solar birthplace".

30
حجم الارض بالنسبة للشمس
"The HITRAN2012 molecular spectroscopic database"
طاقة شمسية
Butti and Perlin 1981, p
الطبيعة في السودان
In Song, Paul; Singer, Howard J
Encyclopedia of the Solar System Bobylev, Vadim; Bajkova, Anisa November 2010
"Effect of daylight saving time on lighting energy use: a literature review" "Ultrastructural findings in solar retinopathy"

"A randomised double-blind study comparing the effect of 1072-nm light against placebo for the treatment of herpes labialis".

19
الطبيعة في السودان
Monthly Notices of the Royal Astronomical Society
الشمس
"New Light on the Heart of Darkness of the Solar Chromosphere"
طاقة شمسية
New View Of The Heliosphere: Cassini Helps Redraw Shape Of Solar System