They're calling this edition "Out of This World," but perhaps they should have called it simply "Outta Here." In case you haven't heard, this will be the last season for the fabled circus, which will be taking down its big top for good next month, after 146 years. That means this will be your last chance to see all the acrobats and clowns and motorcyclists (and other daredevils) and animals (though no elephants) together under one roof. Other circuses remain, of course, but none of them are "The Greatest Show on Earth." Don't let your kids miss out. Opens Thursday and runs through April 30 at Royal Farms Arena, 201 W. Baltimore St. 7:30 p.m. Thursdays-Saturdays, 10:30 a.m. Fridays, 11:30 a.m. and 3:30 p.m. Saturdays, 1 p.m. and 5 p.m. Sundays. $15-$202. royalfarmsarena.com.