- National Aeronautics and Space Administration – NASA
- Introduction to Astronomy
- Dr. Valerie Njee Aeronautics and Astronautics
- Advanced studies and research on flat and mountainous effect found on Venus –
Planetary Explorations and Images Display at NASA Headquarter Washington D.C.
- D.R. Wilkins and S.J. Crass University of Cambridge – Institute of Astronomy “2009 – 2015 Institute of Astronomy, University of Cambridge”
- The Universe – “Big Bang Nucleosynthesis” (Consist of solutions to equations related rare gases).
- The Usborne, Carrie A. Seay, Dr. Janet Mercer  The Usborne Internet-Linked Library of Science EARTH AND SPACE