it's a rlly gianeyeball. and 's an asonomer wkingy, he at palor observory. what it liket? at does all e lightg is is uh, 0-inch mror. thiss why it called a 20. - 0 inchesf mirror 0 inchess biggerhan two big hool des combine - anthen, in addionto ther, you have seconda. so anit bounc off the prary, and en comesp, and en comesownof your inrument.rs, - so theight frothe star comeall the y wn d hits ts mirror d then igoes up th one righthere - d insidehose box arcameras, the es of thtelescop - 'vbeen doi scice with ts teleope fo66 years anwe're stl making grou. - d with aeyebal th big, i cat waito see what wdiscoverext. go luck mang your n grndbreaki discovees th the he telesce. announce weekds on p kids it's "peg + ca... hell a nekind of th show. ♪ 10, 20, 3 40, 5 they're experts at equations and chicken conga lines. [cga music playing] there's no question these guys are great atiguring ings out. we sav the y again! oh, yeah! like how angles make a pyramid and even a doughnut can have a name. it's joanie, thank you very much. watch "peg + cat" weekdays on pbs kids or anytime