How exactly did the dinosaurs go extinct? Was it the scientifically supported theory of a prehistoric bolide smashing into Earth and causing a gradual extinction? Or was it aliens? If you are excited ...

Lisa Kaltenegger, director of the Carl Sagan Institute at Cornell University, hunts for aliens in space by studying Earth across time. By Becky Ferreira Have dinosaurs evolved on other worlds? Could ...

Have dinosaurs evolved on other worlds? Could we spot a planet of glowing organisms? What nearby star systems are positioned to observe Earth passing in front of the sun? These are just a few of the ...