Which of these was a planet till 2006 but is now a “dwarf planet”? (a) Neptune (b) The Sun (c) Pluto (d) Solaris.
Till August 2006, Pluto was considered a planet. However, in a meeting of the International Astronomical Union in 2006, a decision was taken that Pluto would, henceforth, be classified as a 'dwarf planet'.
