<prompt> Bars ka kakaretšo di ama bobedi metsamao ya dinaledi le ya kgase ya gare ga dinaledi ka gare ga galaxies spiral le go ka ama matsogo a spiral le. Milky Way Galaxy, moo Solar System ya rena e lego gona, e hlaolwa bjalo ka barred spiral galaxy. Edwin Hubble o ile a hlaola spiral galaxies tša mohuta wo bjalo ka SB spiral, barred ka tatelano ya gagwe ya Hubble gomme a di beakanya ka dihlopha tša ka tlase go ya ka gore matsogo a spiral a bulegile bjang. Mehuta ya SBa e na le matsogo a tiilego a SBc, mola mehuta ya SBc e le ka matsogong a mangwe gomme e na le dihlopha tša ka tlase.  <response>: Edwin Hubble 