New fossil material found in Patagonia has shed light on the evolution of dinosaurs in the Jurassic age.
Researchers have now discovered how earth looked at various stages in its history - from the age of the dinosaurs to more recent times- and what would come into focus for alien astronomers.
President Barack Obama's speech at Siri Fort auditorium
Day in Pics: 27th January
Showbiz World - January 27, 2015