00663nam a22001577a 450000500170000000800410001702200140005804000420007208200240011424500510013826000500018930000170023944000570025652001740031365000180048720231123111107.0231123b        |||||||| |||| 00| 0 eng d  a2737-5560  cGrade School Learning Resource Center  aBBC Earth Ar31 2022  aAre we alone in the universe? /cMarcus Chown.  aSingapore:bBBC Studios UK Publishing,c2022.  app. 44 - 53.  aBBC Earth: Your Productive Brain.nNo. 13.vVol. 14,  aThe search for alien life is ramping up. But what if, instead of searching for signs of biology, we looked for something more familiar: an extraterrestrial civilisation.  2Solar system.