about townwhat's happeningmovieswhere to gotop acts create a new listing
More... »
Ancient Earth: Fire From Above, Fire From Below

The topic of early Earth is a common debate among space researchers. One side believes it was an uninhabitable place – continuously hit by asteroids and comets left over from planet formation. The other side maintains that early Earth’s surface had abundant liquid water soon after its formation, perhaps as early as 4.4 billion years ago. Water is a key element for life, thus the early Earth might have been a tranquil abode for life to spring. Interestingly, the oldest evidence of life is found in rocks about 4 billion years old. A similar age is also found for the oldest known rocks. As a result, the first 500 million years (that is, from 4 to 4.5 billion years ago) of Earth’s history eludes us. Was the Earth inhabitable during this epoch? Is the lack of an ancient geological record a byproduct of forces that shape today’s Earth, such as plate tectonics? These are fundamental questions to understand how our own planet evolved. Join Dr. Simone Marchi as he discusses the role of collisions during the formation of planet Earth and explores the influence on scientists’ understanding of present-day.