By Heidarzadeh, Tofigh
By Lilensten, Jean, Bornarel
By Heck, Andre
By Bauchau, O. A., Craig, J.I.
By Schattschneider, Peter
By Narisada, Kohei, Schreuder, Duco
By Asimov, Isaac
By Channel, Discovery
By Kitchin, C.R.
By Fairall, Anthony
By Kirshner, Robert P.
By Begelman, Mitchell, Rees, Martin
By Narlikar, Jayant Vishnu
By Benjamin, Marina
By Beatty, J. Kelly, Olry
By Stott, Carole
By Sir Patrick Moore
By Anthony Aveni
By Gilbert, Adrian D.
By Louie Stowell, Adam Larkum
By Lemonick, Michael D.
By Wheeler, J. Craig
By Privett, Grant, Parsons, Paul
By Dunlop, Storm
By Grady, Monica M.
By Loeb, Abraham
By Philip's Maps
By Norton, Arthur P., etc.